Details of the Researcher

PHOTO

Yusaku Ohta
Section
Graduate School of Science
Job title
Professor
Degree

  • 博士（理学）（名古屋大学）

  • 修士（理学）（名古屋大学）

e-Rad No.
50451513
Researcher ID
G-4457-2010

Research History 11

  • 2024/07 - Present
    Tohoku University　Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science　Professor

  • 2024/04 - Present
    Tohoku University　Advanced Institute for Marine Ecosystem Change (WPI-AIMEC), Ocean-Solid Earth Dynamics Research Unit　Unit Leader/Principal Investigator (Concurrent)

  • 2021/04 - Present
    Tohoku University　Division for the Establishment of Frontier Sciences of Organization for Advanced Studies (Concurrent)

  • 2021/04 - Present
    Tohoku University　International Research Institute of Disaster Science Risk Evaluation and Disaster Mitigation Research Division Disaster Geo-informatics Lab. (Concurrent)

  • 2018/03 - Present
    RTi-cast Inc.　Technical Advisor

  • 2014/04 - 2024/06
    Tohoku University　Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science　Associate Professor

  • 2020/04 - 2023/03
    Tohoku University

  • 2018/10 - 2021/03
    Tohoku University　International Research Institute of Disaster Science, Hazard and Risk Evaluation Research Division　Associate Professor (Concurrent)

  • 2007/04 - 2014/03
    Tohoku University　Graduate School of Science, Research Center for Prediction of Earthquakes and Volcanic Eruptions　Assistant Professor

  • 2006/04 - 2007/03
    日本学術振興会　特別研究員−DC2

  • 2003/10 - 2004/09
    University of Alaska Fairbanks Geophysical Institute

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Education 2

  • Nagoya University　環境学研究科　地球環境科学専攻

    - 2007/03

  • Kochi University　Faculty of Science　自然環境科学科

    - 2002/03

Committee Memberships 57

  • ALES Corp.　Chairman of the Verification and Evaluation Committee

    2024/06 - Present

  • Consortium to utilize the SoftBank original reference sites for Earth and Space Science　Representative

    2022/08 - Present

  • 日本学術会議　地球惑星科学委員会IUGG分科会IAG小委員会 委員

    2020/10 - 2026/09

  • 日本測地学会　評議員 (第51期・第52期)

    2024/06 - 2026/05

  • JMA　Committee Member, Volcano Information Advisory Council

    2024/12 - 2026/03

  • 公益社団法人日本地震学会　通常代議員

    2022/04 - 2026/03

  • The Geodetic Society of Japan　Editor-in-chief of journal of the geodetic society of Japan

    2021/06 - 2025/05

  • 国土地理院測地観測センター　高精度測位社会における電子基準点施策のあり方検討会 委員

    2024/07 - 2025/03

  • 国土交通省国土地理院　測量行政懇談会基本政策部会 委員

    2022/06 - 2025/03

  • 国土交通省国土地理院　測量行政懇談会委員

    2022/06 - 2025/03

  • 日本測地学会　第140回講演会 プログラム委員会 委員長

    2023/06 - 2024/05

  • 日本測地学会　海外渡航旅費助成金審査委員

    2022/06 - 2023/05

  • 日本測地学会　評議員 (第48期・第49期)

    2021/06 - 2023/05

  • Earth, Planets and Space　Guest Editor of special issue on “Recent Advances in Scientific Application of GNSS Array Data”

    2021/08 - 2022/08

  • 国土交通省国土地理院　測量行政懇談会 基本政策部会 委員

    2020/10 - 2022/03

  • 公益社団法人 日本地震学会　代議員

    2020/04 - 2022/03

  • 国土交通省国土地理院　測量行政懇談会委員

    2020/04 - 2022/03

  • 国土交通省国土地理院　測量の生産性を向上するための革新技術の導入・活用に関するプロジェクトワーキンググループ委員

    2019/07 - 2021/03

  • 日本測地学会　評議員 (第45期, 第46期)

    2018/06 - 2020/05

  • 公益社団法人 日本地震学会　代議員

    2018/04 - 2020/03

  • 日本測地学会・測地サマースクール　幹事

    2017/04 - 2018/03

  • 公益社団法人 日本地震学会　代議員

    2016/04 - 2018/03

  • 日本測地学会・庶務委員　庶務委員

    2016/04 - 2018/03

  • 公益社団法人 日本地震学会　代議員

    2016/04 - 2018/03

  • 日本測地学会・庶務委員　庶務委員

    2016/04 - 2018/03

  • 日本測地学会　評議員（42期，43期）

    2015/06 - 2017/05

  • 国土地理院測量行政懇談会基本政策部会　委員

    2016/01 - 2017/03

  • 公益社団法人 日本地震学会　代議員

    2014/04 - 2016/03

  • 公益社団法人日本地球惑星科学連合　代議員

    2014/04 - 2016/03

  • 公益社団法人 日本地震学会　代議員

    2014/04 - 2016/03

  • 公益社団法人日本地球惑星科学連合　代議員

    2014/04 - 2016/03

  • 社団法人 日本地震学会 大会・企画委員会　委員

    2013/04 - 2015/03

  • 社団法人 日本地震学会 大会・企画委員会　委員

    2013/04 - 2015/03

  • 公益社団法人日本地震学会夏の学校委員会　委員長

    2014/07 - 2014/10

  • 公益社団法人日本地震学会夏の学校委員会　委員長

    2014/07 - 2014/10

  • 地球惑星科学連合プログラム委員会 (地震学会選出)　委員

    2013/09 - 2014/05

  • 地球惑星科学連合プログラム委員会 (地震学会選出)　委員

    2013/09 - 2014/05

  • 地球惑星科学連合プログラム委員会 (測地学会選出)　委員

    2010/06 - 2014/05

  • 地球惑星科学連合プログラム委員会 (測地学会選出)　委員

    2010/06 - 2014/05

  • 日本地球惑星科学連合2012年大会　セッションコンビーナー（測地学一般）

    2012/02 - 2012/05

  • 日本地球惑星科学連合2012年大会　セッションコンビーナー（測地学一般）

    2012/02 - 2012/05

  • 日本地球惑星科学連合2011年大会　セッションコンビーナー（測地学一般）

    2011/02 - 2011/05

  • 日本地球惑星科学連合2011年大会　セッションコンビーナー（測地学一般）

    2011/02 - 2011/05

  • 日本測地学会　評議員（36期，37期）

    2009/04 - 2011/03

  • 日本測地学会　評議員（36期，37期）

    2009/04 - 2011/03

  • 日本地球惑星科学連合2010年大会　セッションコンビーナー（測地学一般）

    2010/02 - 2010/05

  • 日本地球惑星科学連合2009年大会　セッションコンビーナー（地殻変動）

    2010/02 - 2010/05

  • 日本地球惑星科学連合2010年大会　セッションコンビーナー（測地学一般）

    2010/02 - 2010/05

  • 日本地球惑星科学連合2009年大会　セッションコンビーナー（地殻変動）

    2010/02 - 2010/05

  • 日本地球惑星科学連合2009年大会　セッションコンビーナー（測地学一般）

    2009/02 - 2009/05

  • 日本地球惑星科学連合2009年大会　セッションコンビーナー（地殻変動）

    2009/02 - 2009/05

  • 日本地球惑星科学連合2009年大会　セッションコンビーナー（測地学一般）

    2009/02 - 2009/05

  • 日本地球惑星科学連合2009年大会　セッションコンビーナー（地殻変動）

    2009/02 - 2009/05

  • 日本地球惑星科学連合2008年大会　セッションコンビーナー（測地学一般）

    2008/02 - 2008/05

  • 日本地球惑星科学連合2008年大会　セッションコンビーナー（測地学一般）

    2008/02 - 2008/05

  • 社団法人 日本地震学会　「地震」編集委員

    2011/04 -

  • 社団法人 日本地震学会　「地震」編集委員

    2011/04 -

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Professional Memberships 4

  • 測位航法学会

  • American Geophysical Union (AGU)

  • 日本測地学会

  • 日本地震学会

Research Interests 8

  • GNSS/A observations

  • Ocean Bottom Pressure Measurement

  • GPS

  • Tsunami early warning

  • 震源断層即時推定

  • プレート境界型巨大地震

  • CrustalDeformation

  • GNSS

Research Areas 1

  • Natural sciences / Solid earth science /

Awards 16

  1. The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, Awards for Science and Technology, Research Category

    2024/04　Ministry of Education, Culture, Sports, Science and Technology　Research on real-time analysis of crustal deformation using Global Positioning Satellite System for geo-hazard prediction

  2. 2022 Research Paper Award of the Seismological Society of Japan

    2023/03　Seismological Society of Japan　Improvement on spatial resolution of a coseismic slip distribution using postseismic geodetic data through a viscoelastic inversion

  3. EPS Highlighted Papers 2022

    2023/02　Earth, Planets and Space　Potential for crustal deformation monitoring using a dense cell phone carrier Global Navigation Satellite System network

  4. 20th DOCOMO Mobile Science Award, Excellence Award (Advanced Technology Category)

    2021/09　Mobile Communication Fund

  5. Award for Academic Startups 2021

    2021/08　Japan Science and Technology Agency　RTi-cast

  6. Japan Open Innovation Prize

    2019/03　Cabinet Office, Government of Japan　リアルタイム津波浸水被害予測システムの開発と運用

  7. The Ichimura Prize in Science for Distinguished Achievement

    2017/04/26　公益財団法人 新技術開発財団　リアルタイムGNSSを活用した巨大地震規模即時推定手法の開発

  8. The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology The Young Scientists' Prize

    2017/04/19　文部科学省　測地データ高精度解析による地震火山ハザード即時予測の研究

  9. ジャパン・レジリエンスアワード2016 優秀賞

    2016/03/15　一般社団法人レジリエンスジャパン推進協議会　リアルタイム津波浸水・被害推定システム

  10. Earth, Planets and Space, Highlighted Papers 2015

    2016/02/24　Earth, Planets and Space (Springer)　Advective diffusion of volcanic plume captured by dense GNSS network around Sakurajima volcano: a case study of the vulcanian eruption on July 24, 2012

  11. 23th The Tsuboi Prize of the Geodetic Society of Japan (Individual Prize)

    2015/10/15　日本測地学会　リアルタイム・キネマティックGNSSデータ解析の高度化、及びそれに基づく巨大地震の震源断層即時推定に関する研究

  12. 平成27年度日本火山学会論文賞

    2015/05　日本火山学会　Volume change of the magma reservoir relating to the 2011 Kirishima Shinmoe-dake eruption―Charging, discharging and recharging process inferred from GPS measurements recharging process inferred from GPS measurements

  13. 2013年度日本地震学会論文賞

    2014/03　公益社団法人 日本地震学会　Strain anomalies induced by the 2011 Tohoku Earthquake (Mw9.0) as observed by a dense GPS network in northeastern Japan

  14. 13th The Tsuboi Prize of the Geodetic Society of Japan (Group Prize)

    2013/05　日本測地学会　海陸統合測地観測に基づく2011年東北地方太平洋沖地震に関する研究

  15. 2011 Young Researcher's Award, Seismological Society of Japan

    2012/05　社団法人 日本地震学会　GPSデータ解析の高度化とそれに基づく地震発生過程に関する研究

  16. AGU Outstanding Student Paper Awards (Geodesy Session)

    2004/01　American Geophysical Union

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Papers 155

  1. Geodetic Evidence of Shallow Slow‐Slip Phenomena Beneath the Southern Ryukyu Forearc Peer-reviewed

    Chi‐Hsien Tang, Ya‐Ju Hsu, Yutaro Okada, Yusaku Ohta, Takeshi Sagiya, Pei‐Ru Jian, Yoshiaki Tamura, Takaaki Jike

    Geophysical Research Letters　52　(e2025GL114742)　2025/07/16

    DOI： 10.1029/2025GL114742 　

  2. Evaluation of the favorability of faults to slip: the case of the 2024 Noto Peninsula earthquake Peer-reviewed

    Ayaka Tagami, Tomomi Okada, Martha K. Savage, Calum Chamberlain, Toru Matsuzawa, Ryotaro Fujimura, Kazuya Tateiwa, Keisuke Yoshida, Ryota Takagi, Syuutoku Kimura, Satoshi Hirahara, Taisuke Yamada, Yusaku Ohta

    Earth, Planets and Space　77　(107)　2025/07

    DOI： 10.1186/s40623-025-02235-4 　

  3. Spatio-temporal characteristics in the GEONET F5 solution in the frequency domain estimated based on the robust spectral analysis Peer-reviewed

    Masayuki Kano, Keisuke Yano, Yusuke Tanaka, Tetsuya Takabatake, Yusaku Ohta

    Earth Planets Space　77　(103)　2025/07

    DOI： 10.1186/s40623-025-02236-3 　

  4. Seismic Structure Characterizing the Large Shallow Slip Zone of the 17th‐Century Kuril Earthquake Peer-reviewed

    Ryosuke Azuma, Ryota Hino, Gou Fujie, Koichiro Obana, Yusaku Ohta, Shuichi Kodaira

    Journal of Geophysical Research: Solid Earth　130　(5)　2025/05/23

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2024jb030764 　

    ISSN： 2169-9313

    eISSN： 2169-9356

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    Abstract The southern Kuril Trench subduction zone experienced a M9‐class megathrust earthquake in the 17th century, and another is highly probable within the next 30 years. This earthquake likely exhibited large coseismic slip at the shallower plate boundary fault, causing a devastating tsunami, while the deeper plate boundary experienced smaller slip, similar to the 2011 Tohoku‐oki earthquake. To investigate the structural factors behind the contrasting slip behaviors, we conducted a controlled‐source seismic survey across the Kuril Trench axis. We found that the boundary between the largely‐slipped‐shallow and small‐slipped‐deeper faults aligns with a Vp transition zone in the overriding plate, characterized by sharp landward Vp increase from the low‐Vp frontal wedge (0–30 km from the trench) to the high‐Vp island arc crust (>60 km), and associated with discontinuous near‐horizontal reflectors zone (RZ) above the plate boundary, exhibiting negative polarity. These findings suggest that the slip behavior boundary correlates with sudden trenchward rigidity reduction along the plate boundary, as found in other areas where seismic rupture extended to the trench. The negative‐polarity reflections in the RZ, together with the plate boundary, imply high‐pore‐pressure created by abundant fluid supply from accreted or underplated sediments consolidation and/or dehydration, and oceanic crustal crack cementation. This suggests a weak fault strength at the plate boundary beneath the transition zone, indicating weak mechanical coupling similar to the shallow fault in Tohoku‐oki. Similar to the Tohoku earthquake, a slip‐to‐the‐trench rupture may be triggered by releasing large strain energy accumulated along the deeper fault beneath the high‐rigidity crust.

  5. Significant afterslip contribution to postseismic deformation in Sado Island following the 2024 Noto Peninsula earthquake: insights from two dense GNSS observation networks Peer-reviewed

    Ohtate Miku, Ohta Yusaku, Mitsui Yuta

    Earth, Planets and Space　77　(74)　2025/05/23

    DOI： 10.1186/s40623-025-02203-y 　

  6. Dynamic Stress Estimation During the M 5.7 Remotely Triggered Earthquake Caused by the 2016 M 7.0 Kumamoto Earthquake, Kyushu, Japan, Using Dense Strong-Motion and High-Rate GNSS Data Peer-reviewed

    Kazuma Saito, Hiroaki Takahashi, Mako Ohzono, Yusaku Ohta

    Seismological Research Letters　2025/04/09

    DOI： 10.1785/0220240311 　

  7. Precise aftershock activity in the marine source region of the 2024 Noto-Hanto earthquake by rapid response observation using ocean bottom seismometers Peer-reviewed

    Masanao Shinohara, Ryota Hino, Tsutomu Takahashi, Koichiro Obana, Shuichi Kodaira, Ryosuke Azuma, Tomoaki Yamada, Takeshi Akuhara, Yusuke Yamashita, Eiji Kurashimo, Yoshio Murai, Takehi lsse, Kazuo Nakahigashi, Hisatoshi Baba, Yusaku Ohta, Yoshihiro Ito, Hiroshi Yakiwara, Yukihiro Nakatani, Gou Fujie, Toshinori Sato, Hajime Shiobara, Kimihiro Mochizuki, Shin’ichi Sakai, Yusuke Ota, Syuichi Suzuki, Takehi Isse, Hideji Abe, Shuichirou Hirano, Hiroaki Yamahana, Yojiro Sasagawa, Nanami Murai, Nagisa Nakao, Yuzuru Kaneko, Aina Idoguchi, Kansuke Takahashi, Teruki Ohta, Shuichi Suzuki, Masataka Masuda, Hideji Abe, Shin’ichi Tanaka, Takafumi Kasaya, Satoshi Ogura, Shun Fukushima, Ching-Yu Hu, Hiroaki Yamahana, Nagisa Nakao, Ryotaro Fujimura, Yuto Hirayama, Aina Idoguchi

    Earth, Planets and Space　77　(1)　2025/04/03

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-025-02171-3 　

    eISSN： 1880-5981

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    Abstract The 2024 Noto-Hanto earthquake with a magnitude of 7.6 occurred in the Noto Peninsula on January 1, 2024. The mainshock had a reverse fault focal solution and direction of compression axis was the northwest–southeast. In the Noto Peninsula, earthquake swarms have been observed since December 2020. In contrast to this swarm activity, the mainshock had extending to the marine area. Therefore, we performed a rapid response seafloor seismic observation in the source region and its vicinity. We deployed 34 free-fall pop-up type ocean bottom seismometers (OBSs) in January 2024, recovered 26 short-period OBSs (SPOBSs) after a month. The arrival times of the P- and S-waves were manually read from the data of SPOBSs and land seismic stations based on the event list by a land seismic network. We relocated the hypocenters of the events by combination of the location programs using absolute travel times with station corrections and the double-difference method. A velocity model was derived from the velocity structure by the marine seismic survey. Focal mechanisms were estimated using the grid search method based on the polarities of the first P-wave arrivals. The aftershock depths mostly ranged from 0.2 km to 17 km. Although the aftershock activity seems to be confined in the upper crust, relatively deep events occurred in the easternmost source region. The aftershocks formed several dipping planes corresponding to the multiple faults described in the offshore active fault model constructed before the mainshock. The upper boundaries of the planes of the hypocenter distribution coincide with the upper edges of the modeled faults, and the lower boundary of the aftershock distribution also aligns well with the lower edges of the faults. This consistency indicates that the rupture at the mainshock propagated to faults with different geometries. Although 70 events a reverse fault focal mechanism similar to the mainshock, we identified 87 strike-slip events. Most of the events involving both reverse and strike-slip faults had P-axes perpendicular to the fault strike. This finding suggests that the aftershock activity was affected by a northwest–southeast compressional stress. Graphical Abstract

  8. Transient inflation event at Kussharo caldera, eastern Hokkaido, Japan in 2021–2023 captured by multiple GNSS observation networks Peer-reviewed

    Mako Ohzono, Hiroaki Takahashi, Yusaku Ohta, Keitaro Ohno

    Earth, Planets and Space　77　(1)　2025/04/02

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-025-02173-1 　

    eISSN： 1880-5981

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    Abstract Three Global Navigation Satellite System observation networks realize the detection of an evident transient crustal deformation induced by volcanic inflation activity at the Kussharo caldera, eastern Hokkaido, Japan, from 2021 to 2023. To explain this deformation field, we model three types of volcanic deformation sources, the Mogi, spheroid, and sill, using the Markov Chain Monte Carlo method. Although the spheroid and sill models also show no large differences and can generally explain the observations, the Mogi model best represents the observations, with the source of deformation estimated to be in the center of the caldera at a depth of approximately 5 km. The location of the deformation source is roughly the same regardless of which model was assumed. The inflation source is located west of the Atosanupuri fumaroles, which is the most active area in this caldera, and consistent with the center of the volcanic inflation source in the 1990s detected by the Interferometric Synthetic Aperture Rater analysis. The estimated depth of the deformation source is roughly consistent with the upper limit of the low electrical resistivity region, suggesting the presence of some fluid-like media. The volume change is distributed around 1.1 × 107 m3, about half that of the 1990s event. This study suggests a possibility that the center of the Kussharo caldera usually contracts slowly and quietly but sometimes induces inflations repeatedly. It is still unclear what triggers the inflation event and how it relates to the long-term activity of the volcano, but future monitoring will provide further insight. Graphical Abstract

  9. Prior and Real-Time Estimations of Geohazards Related to Earthquake and Volcanic Eruptions Peer-reviewed

    Yusaku Ohta, Takeshi Tameguri

    Journal of Disaster Research　20　(2)　142-149　2025/04/01

    Publisher: Fuji Technology Press Ltd.

    DOI： 10.20965/jdr.2025.p0142 　

    ISSN： 1881-2473

    eISSN： 1883-8030

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    Prior and real-time estimations of geohazards related to earthquakes and volcanic eruptions are essential to mitigate disasters. This review discusses the results of the past five years through “the Second Earthquake and Volcano Hazards Observation and Research Program (Earthquake and Volcano Hazard Reduction Research)” on the real-time and prior estimation of geohazard related to earthquakes and volcanic eruptions. Investigations have been conducted through cooperation among the research fields of seismology, volcanology, disaster prevention engineering, and social science, in conjunction with the practical services of on-site works to effectively provide advanced and real-time geohazard estimations to people. While remarkable results have been achieved and progress has been made in each research field, the issue remains of how to disseminate the results to society, mainly how to translate the information into disaster information and make it easier for the public to understand.

  10. A Thin and Weak Lithosphere-Asthenosphere Boundary (LAB) Beneath the Oceanic Lithosphere and its Effects on Subduction Earthquake Cycle Deformation

    Tianhaozhe Sun, Kelin Wang, Jiangheng He, Fumiaki Tomita, Takeshi Iinuma, Ryota Hino, Motoyuki Kido, Yusaku Ohta

    EGU 2025 Abstract　2025/03/18

    DOI： 10.5194/egusphere-egu25-13084 　

  11. Seafloor Crustal Deformation Observations Utilizing Unmanned Surface Vehicles for Monitoring Fault Locking and Sliding Processes at Subduction Zone Plate Boundaries Peer-reviewed

    Takeshi Iinuma, Motoyuki Kido, Tatsuya Fukuda, Yusaku Ohta, Fumiaki Tomita, Ryota Hino, Hiroaki Takahashi, Takane Hori, Yusuke Yokota

    2025 IEEE Underwater Technology (UT)　1-5　2025/03/02

    Publisher: IEEE

    DOI： 10.1109/ut61067.2025.10947368 　

  12. Coseismic slip distribution of the 2024 Noto Peninsula earthquake deduced from dense global navigation satellite system network and interferometric synthetic aperture radar data: effect of assumed dip angle Peer-reviewed

    Taisuke Yamada, Yusaku Ohta, Takuya Nishimura, Keisuke Yoshida, Yoshihiro Hiramatsu, Yohei Kinoshita

    Earth, Planets and Space　77　(1)　2025/02/21

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-025-02154-4 　

    eISSN： 1880-5981

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    Abstract The Mw 7.5 Noto Peninsula earthquake, which occurred on January 1, 2024, was considerably hazardous to the peninsula and surrounding regions owing to a strong motion, large-scale crustal deformation, and subsequent tsunami. Significant surface displacement was observed by the dense global navigation satellite system (GNSS) stations, including universities and SoftBank corporation sites, and synthetic aperture radar (SAR). To estimate reliable coseismic slip distribution and its uncertainties for this event, we used the dense GNSS and the line-of-sight displacements from the SAR based on the Bayesian optimization framework. Considering the listric fault structure of this source fault, we validated the fault dip angles using the grid-search approach in the slip estimation. The acquired models indicated reverse fault motion, including a right-lateral slip component, and two slip peaks were estimated in the eastern and western regions of the fault in the central peninsula, independent of the assumed dip angles. These locations correspond to regions of significant uplift and westward displacement. The dip angle assumption affects the horizontal and vertical component of the calculated displacements: a higher dip angle model (≥ 45°) well reproduces vertical components of GNSS and synthetic aperture radar displacements, whereas a lower dip angle model (< 45°) well reproduces horizontal displacements. Overall, a fault dip of 45° is plausible, although it is not consistent with the listric structure suggested by the seismic reflection survey and the aftershock distribution below the central part of the peninsula. To test such a listric fault model, we conducted a coseismic slip estimation assuming a relatively high (60°) and low (25°) dip angles for the shallow and deep sections of the fault, respectively. Even in this case, we acquired a slip model similar to that of a plain fault, which reasonably reproduced each component of the surface displacements as well as the simple plane fault models. These results suggest that listric geometry is also acceptable for the source faults of this event, although the flat geometry similarly explains the observations. Graphical Abstract

  13. GNSS-Acoustic positioning error in the vertical component considering the uncertainty of a reference sound speed profile Peer-reviewed

    Tomita F., Kido M., Iinuma T., Ohta Y.

    Marine Geophysical Research　46　(3)　2025/02

    DOI： 10.1007/s11001-025-09563-w 　

  14. Deformation of the 2020-2024 Noto Peninsula earthquake sequence revealed by combined analysis of multiple GNSS observation networks in central Japan

    Takuya Nishimura, Yoshihiro Hiramatsu, Yusaku Ohta

    2025/01/20

    DOI： 10.5194/egusphere-egu24-22539 　

  15. The 2004 Noto Peninsula Earthquake Tsunami - It's Generation, Propagation, Inundation, and Impact

    Shunichi Koshimura, Bruno Adriano, Ayumu Mizutani, Erick Mas, Yusaku Ohta, Shohei Nagata, Yuriko Takeda, Ruben Vescovo, Sesa Wiguna, Takashi Abe, Takayuki Suzuki

    EGU General Assembly 2024 Abstrac　2025/01/20

    DOI： 10.5194/egusphere-egu24-22527 　

  16. The Impact of the 2024 Noto Peninsula Earthquake Tsunami

    Shunichi Koshimura, Bruno Adriano, Ayumu Mizutani, Erick Mas, Yusaku Ohta, Shohei Nagata, Yuriko Takeda, Ruben Vescovo, Sesa Wiguna, Takashi Abe, Takayuki Suzuki

    EGU General Assembly 2024 Abstrac　2025/01/20

    DOI： 10.5194/egusphere-egu24-22523 　

  17. Novel Real-time Observation of High-resolution Water Vapor Behavior for Detection of Precursors of Cumulonimbus Clouds and Investigation of Their Evolution: - Preliminary Results -

    Ryuichi Ichikawa, Yusaku Ohta, Kentaro Araki, Takuya Tajiri, Mikiko Fujita, Hideki Ujihara, Takayoshi Yamada, Takaaki Jike, Hiroshi Imai, Masahiro Minowa, Yuya Takashima

    EGU General Assembly 2024 Abstrac　2025/01/20

    DOI： 10.5194/egusphere-egu24-6211 　

  18. Real-time modeling of transient crustal deformation through the quantification of uncertainty deduced from GNSS data Peer-reviewed

    Keitaro Ohno, Yusaku Ohta, Naofumi Takamatsu, Hiroshi Munekane, Masato Iguchi

    Earth, Planets and Space　76　(1)　2024/11/01

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-024-02068-7 　

    eISSN： 1880-5981

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    Abstract We propose a new method for real-time uncertainty monitoring of earthquake and volcano source models using data from the global navigation satellite system (GNSS) and explore its application concerning observation station placement. The Geospatial Information Authority of Japan operates two main types of GNSS earth observation network system (GEONET) coordinates for crustal deformation monitoring on different time scales: post-processing analysis values and real-time GEONET analysis system for rapid deformation monitoring (REGARD). REGARD uses the Markov Chain Monte Carlo (MCMC) method termed real-time automatic uncertainty estimation of a coseismic single rectangular model using GNSS data (RUNE) for single rectangular fault model estimation to handle uncertainty. Thus far, no GNSS monitoring system can automatically detect transient crustal deformation events, such as volcanic activity and earthquake swarms, on timescales of a day or less. We extended RUNE and developed a core program for a new monitoring system for earthquake and volcanic source models and their uncertainties. Our program achieved automatic and stable MCMC utilization for rectangular fault, dike, Mogi, and spheroid models by increasing the computational speed, improving search efficiency, and adjusting hyperparameters. The program automatically determines the standard deviation of the likelihood function assuming a normal distribution with weights for each observation station. The calculation time was within 15 s for 1 × 106 samples on a standard 1U server. We assessed the reliability of the developed method using synthetic and observed GNSS data from the 2015 Sakurajima volcanic event. The results were consistent with the assumed model and previous studies and indicated an advantage in automatically quantifying uncertainty in a short computation time. Based on MCMC samples, we developed a new visualization algorithm to indicate areas on a map in which the number of observation stations should be expanded. We assessed the reliability using data from the 2023 Noto Peninsula earthquake [Mj 6.5]. The results indicate that the algorithm is helpful in studying the placement of stations. The above model extensions and their application are essential to achieve a rapid quantitative understanding of disaster events near urban areas and for utilizing this information in emergency response activities. Graphical Abstract

  19. 2023年5月5日の地震を含む能登半島北東部陸海域で継続する地震と災害の総合調査その１

    平松, 良浩, 岡田, 知己, 吉田, 圭佑, 高木, 涼太, 篠原, 雅尚, 酒井, 慎一, 蔵下, 英司, 西村, 卓也, 太田, 雄策, 木下, 陽平, 宮崎, 真一, 後藤, 忠徳, 笠谷, 貴史, 吉村, 令慧, 田中, 愛幸, 宮澤, 理稔, 荒木, 英一郎, 森下, 知晃, 鹿児島, 渉悟, 石山, 達也, 立石, 良, 安江, 健一, 廣内, 大助, 松多, 信尚, 宍倉, 正展, 岩田, 知孝, 浅野, 公之, 大堀, 道広, 村田, 晶, 石川, 浩一郎, 山岸, 邦彰, 須田, 達, 山崎, 新太郎, 青木, 賢人, 林, 紀代美, 武田, 公子, 田中, 純一, 井口, 克郎, 佐々木, 大輔, 原, 裕太, 吉田, 浩, 松本, 聡, 江本, 賢太郎, 山中, 佳子, 勝俣, 啓, 前田, 拓人, 石瀬, 素子, 古谷, 元, 小林, 俊一, 高原, 利幸, 金澤, 伸一, 保坂, 吉則, 王, 功輝, 卜部, 厚志, 片岡, 香子, 高清水, 康博, 永松, 伸吾, 由比, 政年, 犬飼, 直之, 楳田, 真也, 有田, 守, 馬場, 俊孝, 二宮, 順一, 郷右近, 英臣, 林, 豊, 多々納, 裕一, 梶谷, 義雄, 中山, 晶一朗, 藤生, 慎

    自然災害科学総合シンポジウム講演論文集　61　1-16　2024/09/21

    Publisher: 京都大学防災研究所自然災害研究協議会

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    2020年末から地殻変動を伴う群発地震活動が継続する能登半島北東部では，2023年5月5日にマグニチュード6.5（最大震度6強）の地震が発生し，さらに2024年1月1日にはマグニチュード7.6(最大震度7)の地震が発生した。この一連の地震活動の発生メカニズムおよびその災害像や地域社会・地域経済への影響を明らかにするために，令和5年度科学研究費助成事業（特別研究促進費）による総合調査として，地震観測，測地観測，電磁気観測，重力観測，温泉成分測定，活構造調査，強震観測，震災被害調査，地域社会影響調査，津波調査，地域経済・復興過程影響調査を実施している。 主催：京都大学防災研究所自然災害研究協議会; 共催：千葉大学; 日程：2024年9月21日（土）終日（9時30分〜13時00分予定）; 場所：千葉大学西千葉キャンパスけやき会館大ホール ハイブリッド開催 科学研究費補助金・特別研究促進費による突発災害調査研究令和5年度報告

  20. Role of a Hidden Fault in the Early Process of the 2024 Mw7.5 Noto Peninsula Earthquake Peer-reviewed

    Keisuke Yoshida, Ryota Takagi, Yo Fukushima, Ryosuke Ando, Yusaku Ohta, Yoshihiro Hiramatsu

    Geophysical Research Letters　51　(16)　2024/08/23

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2024gl110993 　

    ISSN： 0094-8276

    eISSN： 1944-8007

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    Abstract The 2024 Mw 7.5 Noto Peninsula, Japan, earthquake was initiated within the source region of intense swarm activity. To reveal the mainshock early process, we relocated the earthquake hypocenters and found that many key phenomena, including the mainshock initiation, foreshocks, swarm earthquakes, and deep aseismic slip, occurred at parts of a previously unrecognized fault in intricate fault network. This fault is subparallel (several kilometers deeper) to a known active fault, and the mainshock initiation and foreshocks occurred at the front of a 2‐year westward swarm migration. The initiation location coincides with the destination of the upward migration of a deeper earthquake cluster via several smaller faults. Fluid supply, small earthquakes, and aseismic slip on the fault likely triggered the mainshock, leading to the first major rupture at the western region, propagating further to the west and east sides, resulting in an Mw7.5 event, exceeding 100 km in length.

  21. Experimental GNSS Data Using the Trimble Antenna on the Moving Cart Peer-reviewed

    Tomohiro Inoue, Yusuke Yoko, Tadashi Ishikawa, Kenji Kouno, Yuto Nakamura, Shun-ichi Watanabe, Koya Nagae, Yusaku Ohta

    Journal of the Geodetic Society of Japan　70　1-12　2024/05

    DOI： 10.11366/sokuchi.70.1 　

  22. Numerical experiment toward simultaneous estimation of the spatiotemporal evolution of interseismic fault slips and block motions in southwest Japan Peer-reviewed

    Yusuke Tanaka, Masayuki Kano, Takuya Nishimura, Yusaku Ohta, Keisuke Yano

    Earth, Planets and Space　76　(69)　2024/05

    DOI： 10.1186/s40623-024-02009-4 　

  23. Reduction of non-tidal oceanographic fluctuations in ocean-bottom pressure records of DONET using principal component analysis to enhance transient tectonic detectability International-journal Peer-reviewed

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Tatsuya Kubota, Daisuke Inazu, Tomohiro Inoue, Narumi Takahashi

    Earth, Planets and Space　75　112　2023/07/18

    DOI： 10.1186/s40623-023-01862-z 　

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    Ocean bottom pressure-gauge (OBP) records play an essential role in seafloor geodesy. Oceanographic fluctuations in OBP data, however, pose as a significant noise source in seafloor transient crustal deformation observations, including slow slip events (SSEs), making it crucial to evaluate them quantitatively. To extract the significant fluctuation phenomena common to multiple observation networks, including oceanographic fluctuations and tectonic signals, we applied principal component analysis (PCA) to the 3-year Dense Oceanfloor Network System for Earthquakes and Tsunamis (DONET) OBP time series for 40 stations during 2016–2019. PCA could separate several oceanographic signals based on the characteristics of their spatial distributions, although evident transient tectonic signals could not be confirmed from the observed pressure records during this observed period. The spatial distribution of the first four principal components (PCs) reflected the common component, inclined component along sea depth, longitude component, and parabola-like pattern, respectively. By subtracting each PC (in particular, PC-2 and PC-4) from the time series, we could significantly reduce the sea depth dependence of OBP records, which has been highlighted in several previous studies and is also evident in this region. We interpreted PCs 2–4 as the reflection of the strength and meandering of ocean geostrophic currents based on a comparison with the PC spatial distribution of the numerical oceanographic models. In addition, to evaluate the ability of PCA to separate transient tectonic signal from OBP time series, including oceanographic fluctuations, we conducted a synthetic ramp assuming an SSE by rectangular fault and then applied PCA. The assumed synthetic tectonic signal could be separated from the oceanographic signals and included in the principal component independently depending on its amplitude, suggesting that the spatial distribution of each PC would change if the amplitude of the synthetic signal were sufficiently large. We propose a transient event-detection method based on the spatial distribution difference of a specific PC with or without a tectonic signal. We used the normalized inner product (NIP) between these PCs as the indicator of their similarities. This method can detect transient tectonic signals more significantly than the moment-magnitude scale of 5.9 from OBP records.

  24. Episodic transient deformation revealed by the analysis of multiple GNSS networks in the Noto Peninsula, central Japan Peer-reviewed

    Takuya Nishimura, Yoshihiro Hiramatsu, Yusaku Ohta

    Scientific Reports　13　(1)　2023/06/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-023-35459-z 　

    eISSN： 2045-2322

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    Abstract Since November 30, 2020, an intense seismic swarm and transient deformation have been continuously observed in the Noto Peninsula, central Japan, which is a non-volcanic/geothermal area far from major plate boundaries. We modeled transient deformation based on a combined analysis of multiple Global Navigation Satellite System (GNSS) observation networks, including one operated by a private sector company (SoftBank Corp.), relocated earthquake hypocenters, and tectonic settings. Our analysis showed a total displacement pattern over 2 years shows horizontal inflation and uplift of up to ~ 70 mm around the source of the earthquake swarm. In the first 3 months, the opening of the shallow-dipping tensile crack had an estimated volumetric increase of ~ 1.4 × 107 m3 at a depth of ~ 16 km. Over the next 15 months, the observed deformation was well reproduced by shear-tensile sources, which represent an aseismic reverse-type slip and the opening of a southeast-dipping fault zone at a depth of 14–16 km. We suggest that the upwelling fluid spread at a depth of ~ 16 km through an existing shallow-dipping permeable fault zone and then diffused into the fault zone, triggering a long-lasting sub-meter aseismic slip below the seismogenic depth. The aseismic slip further triggered intense earthquake swarms at the updip.

  25. Non-tidal oceanographic fluctuation characteristics recorded in DONET ocean-bottom pressure time series using principal component analysis

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Tatsuya Kubota, Daisuke Inazu, Tomohiro Inoue, Narumi Takahashi

    2023/03/28

    DOI： 10.22541/essoar.167458069.92503323/v2 　

  26. Heterogeneous rheology of Japan subduction zone revealed by postseismic deformation of the 2011 Tohoku-oki earthquake Peer-reviewed

    Sambuddha Dhar, Jun Muto, Yusaku Ohta, Takeshi Iinuma

    Progress in Earth and Planetary Science　10　(9)　2023/03

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40645-023-00539-1 　

    eISSN： 2197-4284

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    Abstract The 2011 Tohoku-oki earthquake produced the most well-recorded postseismic deformation of any megathrust earthquake in the world. Over the last decade, researchers have used a dense and widespread geodetic network of more than 1300 Global Navigation Satellite System (GNSS) stations inland, as well as the about 50 stations on the seafloor, to investigate the various deformation sources responsible for the observed crustal deformation. One of the contributing mechanisms to this crustal deformation is the stress relaxation of the viscoelastic mantle beneath the Japanese arc. As evident in experimental rock physics and geophysical observations, ambient mantle conditions and related rheology are expected to be heterogeneous in space. However, the contribution of such rheological heterogeneities to the postseismic deformation is still poorly understood. Here, we piece together several rheological heterogeneities inferred from the decade-long postseismic deformation of the 2011 Tohoku-oki earthquake. We reviewed more than twenty postseismic models to understand how viscoelastic earth can influence the postseismic surface deformation observed after the Tohoku-oki earthquake. Besides, we employed several synthetic models to tease out the contribution of individual rheological heterogeneities such as depth-dependent rheology of mantle wedge, oceanic asthenosphere, and low-viscosity zone beneath the volcanic front. We demonstrate that the vertical postseismic observation is the key to unravel rheological complexity beneath northeastern Japan. The broader vertical deformation pattern reveals the major viscosity contrast between backarc and forearc, and small-scale subsidence detects the presence of low-viscosity bodies related to arc magmatism. In short, this review paper provides a vista of three-dimensional heterogeneous rheology of viscoelastic earth. These rheological heterogeneities may play a crucial role in bridging the gap between our understanding of different phase of subduction zone earthquake cycle.

  27. Non-tidal oceanographic fluctuation characteristics recorded in DONET ocean-bottom pressure time series using principal component analysis

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Tatsuya Kubota, Daisuke Inazu, Tomohiro Inoue, Narumi Takahashi

    2023/01/24

    DOI： 10.22541/essoar.167458069.92503323/v1 　

  28. Assessment of S-net seafloor pressure data quality in view of seafloor geodesy Peer-reviewed

    Ryota Hino, Tatsuya Kubota, Naotaka Y. Chikasada, Yusaku Ohta, Hideto Otsuka

    Progress in Earth and Planetary Science　9　(1)　2022/12/30

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40645-022-00526-y 　

    eISSN： 2197-4284

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    Abstract Long-term continuous observation of seafloor pressure is effective for detecting seafloor vertical deformations that are associated with transient tectonic phenomena such as slow slip events. Since the aseismic slip event prior to the 2011 Tohoku earthquake, several discoveries have been made on spontaneous slow slip events and various other types of slow earthquake along the Japan and Kuril Trenches. Seafloor observation network for earthquakes and tsunamis along the Japan Trench (S-net) is expected to provide invaluable information on slow slip activities via geodetic signals that are detected by pressure observation. This study inspects the quality of the S-net pressure data in view of seafloor geodesy by comparison with records obtained by more than 100 autonomous ocean bottom pressure recorders (OBPRs) deployed along the Japan Trench. OBPRs have long been standard tools in seafloor geodesy, and the data collected are considered a benchmark in terms of quality. Most of the S-net stations showed noise levels that are considerably higher than those of the OBPRs over periods of more than 2 d. We speculate that a strong correlation between pressure and temperature accounts for much of the long-term noise. In this study, the temperature-dependent fluctuation component was estimated by prediction filtering and removed from the original data, leading to a significant reduction in the noise level at 51 stations, which reached levels almost equivalent to those of OBPRs. Although no significant pressure changes have been identified as associated with the 2018 Boso SSE or repeated tremor bursts in the northern Japan Trench thus far, our findings indicate that these stations are sufficiently sensitive to detect slow slip events occurring nearby.

  29. Tectonic tremors immediately after the 2011 Tohoku-Oki earthquake detected by near-trench seafloor seismic observations Peer-reviewed

    Hidenobu Takahashi, Ryota Hino, Naoki Uchida, Takanori Matsuzawa, Yusaku Ohta, Syuichi Suzuki, Masanao Shinohara

    Progress in Earth and Planetary Science　9　(1)　1-14　2022/12/07

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40645-022-00525-z 　

    eISSN： 2197-4284

  30. Comparison between the Hamiltonian Monte Carlo method and the Metropolis–Hastings method for coseismic fault model estimation Peer-reviewed

    Taisuke Yamada, Keitaro Ohno, Yusaku Ohta

    Earth, Planets and Space　74　(86)　1-16　2022/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-022-01645-y 　

    eISSN： 1880-5981

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    Abstract A rapid source fault estimation and quantitative assessment of the uncertainty of the estimated model can elucidate the occurrence mechanism of earthquakes and inform disaster damage mitigation. The Bayesian statistical method that addresses the posterior distribution of unknowns using the Markov chain Monte Carlo (MCMC) method is significant for uncertainty assessment. The Metropolis–Hastings method, especially the Random walk Metropolis–Hastings (RWMH), has many applications, including coseismic fault estimation. However, RWMH exhibits a trade-off between the transition distance and the acceptance ratio of parameter transition candidates and requires a long mixing time, particularly in solving high-dimensional problems. This necessitates a more efficient Bayesian method. In this study, we developed a fault estimation algorithm using the Hamiltonian Monte Carlo (HMC) method, which is considered more efficient than the other MCMC method, but its applicability has not been sufficiently validated to estimate the coseismic fault for the first time. HMC can conduct sampling more intelligently with the gradient information of the posterior distribution. We applied our algorithm to the 2016 Kumamoto earthquake (MJMA 7.3), and its sampling converged in 2 × 104 samples, including 1 × 103 burn-in samples. The estimated models satisfactorily accounted for the input data; the variance reduction was approximately 88%, and the estimated fault parameters and event magnitude were consistent with those reported in previous studies. HMC could acquire similar results using only 2% of the RWMH chains. Moreover, the power spectral density (PSD) of each model parameter's Markov chain showed this method exhibited a low correlation with the subsequent sample and a long transition distance between samples. These results indicate HMC has advantages in terms of chain length than RWMH, expecting a more efficient estimation for a high-dimensional problem that requires a long mixing time or a problem using nonlinear Green’s function, which has a large computational cost. Graphical Abstract

  31. Continuous estimation of coseismic and early postseismic slip phenomena via the GNSS carrier phase to fault slip approach: a case study of the 2011 Tohoku-Oki sequence Peer-reviewed

    Yusuke Tanaka, Yusaku Ohta, Shin’ichi Miyazaki

    Progress in Earth and Planetary Science　9　(55)　1-20　2022/10/18

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40645-022-00514-2 　

    eISSN： 2197-4284

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    Abstract The transition process from coseismic to early postseismic phenomena within a half-day remains a significant topic for understanding the slip budget and friction properties of the fault. However, the investigation of this phase has undergone limited advancement. This is mainly due to the lack of precision pertaining to the Global Navigation Satellite System (GNSS) analysis caused by difficulty of separation between fault slip and other unknown parameters such as tropospheric delay. Therefore, we propose an alternative approach (phase-to-slip; PTS) that detects fault slip directly from GNSS carrier phase variation without conventional positioning. Since the PTS simultaneously estimates fault slip and other unknowns, we can quantitatively evaluate their separation accuracy and contribution in the estimation. This study attempts to continuously estimate the coseismic and early postseismic slip of the 2011 Tohoku-Oki sequence using the PTS method. We analyzed 1-Hz carrier phase data for approximately 2 h before and after the mainshock origin (2011/03/11/05:46UTC). As a result, we successfully obtained the coseismic slip of the Mw9.0 mainshock and two major aftershocks in the off-Ibaraki (Mw7.8) and off Iwate (Mw7.4) regions. For all three events, the estimated slip distribution, equivalent moment magnitude, and calculated displacement field well agreed with those from the conventional positioning. Additionally, our results suggest postseismic slip mainly in the downdip area adjacent to the mainshock rupture. We obtained three major slip areas around the downdip region near Aomori, Iwate, and Miyagi. The estimated slip amount reaches approximately 0.1–0.2 m in 34 min immediately after the mainshock. The equivalent seismic moment of the slip areas near Iwate and Miyagi were approximately Mw7.4. This amount is similar or slightly greater than the estimations based on conventional positioning. Significant overlap is observed in the locations of the slip areas. In this manner, PTS continuously detected a series of coseismic and early postseismic slips with timescale ranging from a few minutes to an hour. Our results demonstrate the capability of the PTS method for broadband fault slip monitoring and its potential contribution to the investigation of early postseismic phenomena.

  32. Updated absolute gravity rate of change associated with glacial isostatic adjustment in Southeast Alaska and its utilization for rheological parameter estimation Peer-reviewed

    Kazuhiro Naganawa, Takahito Kazama, Yoichi Fukuda, Satoshi Miura, Hideaki Hayakawa, Yusaku Ohta, Jeffrey T. Freymueller

    Earth, Planets and Space　74　(116)　1-27　2022/07/25

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-022-01666-7 　

    eISSN： 1880-5981

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    Abstract In Southeast Alaska (SE-AK), rapid ground uplift of up to 3 cm/yr has been observed associated with post-Little Ice Age glacial isostatic adjustment (GIA). Geodetic techniques such as global navigation satellite system (GNSS) and absolute gravimetry have been applied to monitor GIA since the last 1990s. Rheological parameters for SE-AK were determined from dense GNSS array data in earlier studies. However, the absolute gravity rate of change observed in SE-AK was inconsistent with the ground uplift rate, mainly because few gravity measurements from 2006 to 2008 resulted in imprecise gravity variation rates. Therefore, we collected absolute gravity data at six gravity points in SE-AK every June in 2012, 2013, and 2015, and updated the gravity variation rate by reprocessing the absolute gravity data collected from 2006 to 2015. We found that the updated gravity variation rate at the six gravity points ranged from −2.05 to −4.40 $$\upmu$$Gal/yr, and its standard deviation was smaller than that reported in the earlier study by up to 88 %. We also estimated the rheological parameters under the assumption of the incompressible Earth to explain the updated gravity variation rate, and their optimal values were determined to be 55 km and $$1.2 \times 10^{19}$$ Pa s for lithospheric thickness and upper mantle viscosity, respectively. These optimal values are consistent with those independently obtained from GNSS observations, and this fact indicates that absolute gravimetry can be one of the most effective methods in determining sub-surface structural parameters associated with GIA accurately. Moreover, we utilized the gravity variation rates for estimating the ratio of gravity variation to vertical ground deformation at the six gravity points in SE-AK. The viscous ratio values were obtained as −0.168 and −0.171 $$\upmu$$Gal/mm from the observed data and the calculated result, respectively. These ratios are greater (in absolute) than those for other GIA regions (−0.15 to −0.16 $$\upmu$$Gal/mm in Antarctica and Fennoscandia), because glaciers in SE-AK have melted more recently than in other regions. Graphical Abstract

  33. Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region Peer-reviewed

    Sota Murakami, Tsuyoshi Ichimura, Kohei Fujita, Takane Hori, Yusaku Ohta

    GeoHazards　3　(2)　162-177　2022/04/06

    Publisher: MDPI AG

    DOI： 10.3390/geohazards3020009 　

    eISSN： 2624-795X

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    Since huge earthquakes are expected along plate subduction zones such as the Japan Trench and Nankai Trough, the estimation of coseismic slip and interseismic slip deficit is essential for immediate response and preliminary measures to reduce damage. Recently, analysis considering the complex topography and underground structure of the plate subduction zone has been performed for improving the estimation performance. However, the three-dimensional (3D) crustal structural model needs to be improved continuously. In this paper, we obtained Green’s functions for 3D crustal structural models with ambiguity by 3D crustal deformation analysis, and the coseismic slip and interseismic slip deficit were estimated. Here we enabled the calculation of many Green’s functions with different physical properties of the 3D crustal structure by utilizing a GPU-based 3D crustal deformation analysis method that significantly reduces the analysis cost. The physical properties on the upper plate’s side, which are located above the plate boundary fault, were changed. We found no significant difference in the estimation performance, except for the upper crust, which most of the fault slip area is in contact with, in the case of coseismic slip estimation. In contrast, the coseismic slip estimation when the properties of the upper crust was changed had a significant error, and a negative slip was estimated at the deep part of the plate boundary where no slip was originally given.

  34. Impact of employing a waveglider on GNSS-Acoustic survey along the Japan trench

    Motoyuki Kido, Chie Honsho, Fumiaki Tomita, Yusaku Ohta, Ryota Hino, Takeshi Iinuma

    2022/03/27

    Publisher: Copernicus {GmbH}

    DOI： 10.5194/egusphere-egu22-2138 　

  35. Along-arc heterogeneous rheology inferred from post-seismic deformation of the 2011 Tohoku-oki earthquake Peer-reviewed

    Sambuddha Dhar, Jun Muto, Yoshiaki Ito, Satoshi Miura, James D P Moore, Yusaku Ohta, Takeshi Iinuma

    Geophysical Journal International　230　(1)　202-215　2022/03/24

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/gji/ggac063 　

    ISSN： 0956-540X

    eISSN： 1365-246X

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    SUMMARY The Japan forearc plays a crucial role in modulating the post-seismic deformation in response to the enormous stress perturbation induced by the 2011 Tohoku-oki earthquake. Dense geodetic observations across Japan have revealed coupled interactions between afterslip on the subducting plate interface and viscous deformation within the mantle wedge, and detailed numerical models can provide further profound insights into the forearc rheology. Recent studies have revealed the presence of a stagnant section in the forearc mantle of the Tohoku subduction zone, and here we investigate the associated along-arc variation of the stagnant part of the mantle wedge (cold nose) across Japan. We utilize a newly deployed geodetic network along a corridor in the Fukushima–Niigata region and compare the surface deformation pattern to that of the Miyagi–Yamagata corridor close to the main rupture area. We present a 3-D rheological model using laboratory-derived constitutive laws to simulate the geodetic observations including displacement fields and their time-series. Our results suggest along-arc heterogeneity in the forearc mantle rheology; specifically, we find a narrower cold nose in the Miyagi region and a wider one in the Fukushima forearc. The geodetic inferences on the forearc variation are consistent with along-arc spatial heterogeneity in the cut-off depth for shallow earthquakes as well as comparative measurements of the respective geothermal gradients between the Miyagi and Fukushima regions.

  36. Potential for crustal deformation monitoring using a dense cell phone carrier Global Navigation Satellite System network Peer-reviewed

    Yusaku Ohta, Mako Ohzono

    Earth, Planets and Space　74　(25)　1-9　2022/02/09

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-022-01585-7 　

    eISSN： 1880-5981

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    <title>Abstract</title>Monitoring of crustal deformation provides essential information for seismology and volcanology. For such earth science fields and other purposes, various Global Navigation Satellite System (GNSS) networks have been constructed at the national and regional levels. In Japan, the continuous nationwide GNSS network, the GNSS Earth Observation Network System (GEONET), is operated by the Geospatial Information Authority of Japan. Although GEONET has made a substantial contribution to earth science research, the large spacing of GEONET sites makes it difficult to accurately understand crustal deformation phenomena in some cases. However, cell phone carriers in Japan have constructed independent GNSS networks to improve their positioning services in recent years. In this study, we examine the performance of a GNSS network operated by SoftBank Corp. for crustal deformation monitoring. The network has more than 3300 sites throughout Japan, which is approximately 2.5 times the number of the GEONET sites. To assess the quality of SoftBank's GNSS data, we first analyzed data from Miyagi Prefecture and evaluated the stability of the coordinate time series for nine consecutive days during a quiet (interseismic) period. The calculated standard deviations were approximately the same for both networks. Furthermore, we calculated the displacement between September 2020 and March 2021. The results reveal that almost all SoftBank sites showed a consistent displacement with their surrounding GEONET sites. Next, we analyzed the coseismic deformation associated with the off-Fukushima earthquake (MJMA 7.3) on February 13, 2021, in both static and kinematic modes. We obtained a westward coherent displacement along the coastline in both networks, although several outliers were observed for the SoftBank sites. Based on these initial assessments, we conclude that these private sector GNSS sites are useful for crustal deformation monitoring with appropriate data quality control. <bold>Graphical Abstract</bold>

  37. Rapid and quantitative uncertainty estimation of coseismic slip distribution for large interplate earthquakes using real-time GNSS data and its application to tsunami inundation prediction Peer-reviewed

    Keitaro Ohno, Yusaku Ohta, Ryota Hino, Shunichi Koshimura, Akihiro Musa, Takashi Abe, Hiroaki Kobayashi

    Earth, Planets and Space　74　(24)　2022/02

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-022-01586-6 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  38. Real-time automatic uncertainty estimation of coseismic single rectangular fault model using GNSS data International-journal Peer-reviewed

    Keitaro Ohno, Yusaku Ohta, Satoshi Kawamoto, Satoshi Abe, Ryota Hino, Shunichi Koshimura, Akihiro Musa, Hiroaki Kobayashi

    Earth, Planets and Space　73　(1)　2021/06

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-021-01425-0 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  39. Sensitivity Analysis for Seafloor Geodetic Constraints on Coseismic Slip and Interseismic Slip-Deficit Distributions Peer-reviewed

    Sota Murakami, Tsuyoshi Ichimura, Kohei Fujita, Takane Hori, Yusaku Ohta

    Frontiers in Earth Science　9　2021/04/21

    Publisher: Frontiers Media SA

    DOI： 10.3389/feart.2021.614088 　

    eISSN： 2296-6463

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    Estimating the coseismic slip distribution and interseismic slip-deficit distribution play an important role in understanding the mechanism of massive earthquakes and predicting the resulting damage. It is useful to observe the crustal deformation not only in the land area, but also directly above the seismogenic zone. Therefore, improvements in terms of measurement precision and increase in the number of observation points have been proposed in various forms of seafloor observation. However, there is lack of research on the quantitative evaluation of the estimation accuracy in cases where new crustal deformation observation points are available or when the precision of the observation methods have been improved. On the other hand, the crustal structure models are improving and finite element analysis using these highly detailed crustal structure models is becoming possible. As such, there is the real possibility of performing an inverted slip estimation with high accuracy via numerical experiments. In view of this, in this study, we proposed a method for quantitatively evaluating the improvement in the estimation accuracy of the coseismic slip distribution and the interseismic slip-deficit distribution in cases where new crustal deformation observation points are available or where the precision of the observation methods have been improved. As a demonstration, a quantitative evaluation was performed using an actual crustal structure model and observation point arrangement. For the target area, we selected the Kuril Trench off Tokachi and Nemuro, where M9-class earthquakes have been known to occur in the past and where the next imminent earthquake is anticipated. To appropriately handle the effects of the topography and plate boundary geometry, a highly detailed three-dimensional finite element model was constructed and Green’s functions of crustal deformation were calculated with high accuracy. By performing many inversions via optimization using Green’s functions, we statistically evaluated the effect of increase in the number of observation points of the seafloor crustal deformation measurement and the influence of measurement error, taking into consideration the diversity of measurement errors. As a result, it was demonstrated that the observation of seafloor crustal deformation near the trench axis plays an extremely important role in the estimation performance.

  40. GNSS-Acoustic Observations of Seafloor Crustal Deformation Using a Wave Glider Peer-reviewed

    Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Tatsuya Fukuda, Fumiaki Tomita, Iwao Ueki

    Frontiers in Earth Science　9　2021/03/11

    Publisher: Frontiers Media SA

    DOI： 10.3389/feart.2021.600946 　

    eISSN： 2296-6463

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    Crustal deformation of the seafloor is difficult to observe solely using global navigation satellite system (GNSS). The GNSS-acoustic (GNSS-A) technique was developed to observe seafloor crustal deformation, and it has produced a steady series of successful observations with remarkable results related to crustal deformation associated with huge earthquakes around the Japanese Islands. However, utilizing GNSS-A incurs very large financial and human costs as it requires the use of a research vessel as a surface platform and has a limited observation frequency, which is less than once a year at seafloor stations along the Japan Trench. To conduct frequent observations, an automatic GNSS-A data acquisition system was developed that operates via an unmanned surface vehicle (wave glider). The first observations using this system were performed at a seafloor station off Aomori Prefecture in July 2019. The wave glider was equipped with two GNSS antennas, an acoustic transducer, a microelectromechanical system gyroscope, and associated control and logging units. Data acquisition and autonomous activation of the seafloor stations were successfully executed by controlling the power supply to the payload via satellite communication with the wave glider. The glider rarely strayed off the configured course and the solar panels generated sufficient power to perform the observations although the weather was mostly cloudy. The GNSS-A data processing results show that the position of the station was determined with the same accuracy and precision as in previous observations performed using a research vessel.

  41. Extracting near‐field seismograms from ocean‐bottom pressure gauge inside the focal area: application to the 2011 Mw 9.1 Tohoku‐Oki earthquake Peer-reviewed

    T. Kubota, T. Saito, H. Tsushima, R. Hino, Y. Ohta, S. Suzuki, D. Inazu

    Geophysical Research Letters　48　(7)　e2020GL091664　2021/03/10

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2020gl091664 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  42. Improvement on spatial resolution of a coseismic slip distribution using postseismic geodetic data through a viscoelastic inversion Peer-reviewed

    Fumiaki Tomita, Takeshi Iinuma, Yusaku Ohta, Ryota Hino, Motoyuki Kido, Naoki Uchida

    Earth, Planets and Space　72　(1)　2020/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-020-01207-0 　

    eISSN： 1880-5981

  43. Urgent Joint Seismic Observation Data of the 2016 Kumamoto Earthquakes Peer-reviewed

    Azusa SHITO, Ayaho MITSUOKA, Satoshi MATSUMOTO, Takeshi MATSUSHIMA, Koki AIZAWA, Hiroshi SHIMIZU, Kazunari UCHIDA, Megumi KAMIZONO, Yoshiko TEGURI, Manami NAKAMOTO, Rintaro MIYAMACHI, Masayoshi ICHIYANAGI, Mako OHZONO, Kazumi OKADA, Kei KATSUMATA, Masamitsu TAKADA, Hiroaki TAKAHASHI, Yuichiro TANIOKA, Teruhiro YAMAGUCHI, Masahiro KOSUGA, Ryosuke AZUMA, Naoki UCHIDA, Kentaro EMOTO, Yusaku OHTA, Tomomi OKADA, Toshiki KAIDA, Tomofumi KOZONO, Syuichi SUZUKI, Ryota TAKAGI, Tomotsugu DEMACHI, Hisashi NAKAHARA, Takashi NAKAYAMA, Satoshi HIRAHARA, Toru MATSUZAWA, Satoshi MIURA, Mare YAMAMOTO, Kazutoshi IMANISHI, Takahiko UCHIDE, Masayuki YOSHIMI, Shin AOI, Youichi ASANO, Tomotake UENO, Eisuke FUJITA, Eiji ABE, Takashi IIDAKA, Takaya IWASAKI, Aitaro KATO, Eiji KURASHIMO, Shin’ichi SAKAI, Takahiro SHIINA, Masato SERIZAWA, Shinichi TANAKA, Shigeki NAKAGAWA, Naoshi HIRATA, Masataka MASUDA, Koji MIYAKAWA, Takeo YAGI, Atsushi WATANABE, Kazuhiko GOTO, Takeo ITO, Takashi OKUDA, Toshiko TERAKAWA, Shinichiro HORIKAWA, Yuta MAEDA, Kenjiro MATSUHIRO, Yoshiko YAMANAKA, Toshiki WATANABE, Yoshihisa IIO, Hiroshi KATAO, Yasuyuki KANO, Hiroo TSUDA, Tsutomu MIURA, Tomoya MURAMOTO, Yusuke YAMASHITA, Makoto OKUBO, Tadashi YAMASHINA, Takahiro OHKURA, Shigeru NAKAO, Shuichiro HIRANO, Hiroki MIYAMACHI, Hiroshi YAKIWARA

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.)　73　(0)　149-157　2020/10/27

    Publisher: Seismological Society of Japan

    DOI： 10.4294/zisin.2019-11 　

    ISSN： 0037-1114

    eISSN： 2186-599X

  44. Prior and Real-Time Estimations of Ground Motions, Tsunamis, and Other Geodynamic Hazards Peer-reviewed

    Kagawa T. and Y. Ohta

    Journal of Disaster Research　15　(2)　144-151　2020/03

  45. Capture of eruption column used by GPS: the Sakurajima eruption on August 18, 2013

    Asakura Yukako, Nishimura Takeshi, Ohta Yusaku, Kano Masayuki, Iguchi Masato

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2020　40-40　2020

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2020.0_40 　

    ISSN： 2433-5320

    eISSN： 2189-7190

  46. Coupled afterslip and transient mantle flow after the 2011 Tohoku earthquake Peer-reviewed

    J. Muto, J. D, P. Moore, S. Barbot, T. Iinuma, Y. Ohta, H. Iwamori

    Science Advances　5　(eaaw1164)　1-8　2019/09

    DOI： 10.1126/sciadv.aaw1164 　

    eISSN： 2375-2548

  47. Assessment of directional accuracy of GNSS-Acoustic measurement using a slackly moored buoy Peer-reviewed

    Imano, M, M. Kido, C. Honsho, Y. Ohta, N. Takahashi, T. Fukuda

    Prog. Earth Planet. Sci.　6　(56)　1-14　2019/08

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40645-019-0302-1 　

    eISSN： 2197-4284

  48. Integrated Monitoring of Volcanic Ash and Forecasting at Sakurajima Volcano, Japan Peer-reviewed

    Masato Iguchi, Haruhisa Nakamichi, Hiroshi Tanaka, Yusaku Ohta, Atsushi Shimizu, Daisuke Miki

    JOURNAL OF DISASTER RESEARCH　14　(5)　798-809　2019/08

    DOI： 10.20965/jdr.2019.p0798 　

    ISSN： 1881-2473

    eISSN： 1883-8030

  49. Real‐Time Coseismic Slip Estimation via the GNSS Carrier Phase to Fault Slip Approach: A Case Study of the 2016 Kumamoto Earthquake Peer-reviewed

    Yusuke Tanaka, Yusaku Ohta, Shin'ichi Miyazaki

    Geophysical Research Letters　46　(3)　1367-1374　2019/02/16

    DOI： 10.1029/2018GL080741 　

  50. Seafloor geodesy revealed partial creep of the North Anatolian Fault submerged in the Sea of Marmara Peer-reviewed

    Yamamoto R, M. Kido, Y. Ohta, N. Takahashi, Y. Yamamoto, A. Pinar, D. Kalafat, H. Özener, Y. Kaneda

    Geophys. Res. Lett.　46　(3)　1268-1275　2019/02

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2018GL080984 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  51. Trial of Quantitative Uncertainty Estimation for the Single Rectangular Coseismic Fault Model Deduced from Real-time GNSS Data Using the MCMC Approach: A Case Study of the 2011 Tohoku-Oki Earthquake Peer-reviewed

    Ohno K, Y. Ohta

    Journal of the Geodetic Society of Japan　64　39-50　2018/10

    DOI： 10.11366/sokuchi.64.39 　

  52. Triangulation scale error caused by the 1894 Shonai earthquake: a possible cause of erroneous interpretation of seismic potential along the Japan Trench Peer-reviewed

    Sagiya, T, N. Matta, Y. Ohta

    Earth, Planets Space　70　(1)　120-133　2018/07

    DOI： 10.1186/s40623-018-0890-9 　

    ISSN： 1880-5981

  53. Coseismic Slip Distribution of the 2 July 2013 M-w 6.1 Aceh, Indonesia, Earthquake and Its Tectonic Implications Peer-reviewed

    Gunawan, Endra, Widiyantoro, Sri, Rosalia, Shindy, Daryono, Mudrik Rahmawan, Meilano, Irwan, Supendi, Pepen, Ito, Takeo, Tabei, Takao, Kimata, Fumiaki, Ohta, Yusaku, Ismail, Nazli

    Bulletin of the Seismological Society of America　108　(4)　2018/06

    DOI： 10.1785/0120180035 　

  54. Onboard realtime processing of GPS-acoustic data for moored buoy-based observation Peer-reviewed

    Kido, M, M. Imano, Y. Ohta, T. Fukuda, N. Takahashi, S. Tsubone, Y. Ishihara, H. Ochi, K. Imai, C. Honsho, R. Hino

    J. Disaster Res.　13　(3)　472-488　2018/06

    Publisher: Fuji Technology Press Ltd.

    DOI： 10.20965/jdr.2018.p0472 　

    ISSN： 1881-2473

    eISSN： 1883-8030

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    Realtime observations of vertical/horizontal seafloor movements and sea surface height associated with a huge earthquake are crucial for immediate recognition of its causal fault rupture, so that tsunami early warning can be issued and also the risk of subsequent ruptures can be evaluated. For this purpose, we developed an offshore monitoring system using a moored buoy platform to measure, in realtime, the three observables mentioned above and operated it on a trial basis for a year. While operating the system, GPS-acoustic observation of horizontal movement on the buoy was especially a new challenge. To achieve realtime GPS-acoustic observation under conditions of the limited power supply and narrow bandwidth in satellite communication, we developed special hardware suitable for use on a buoy and software to minimize onboard computational procedures and data transmission. The system functioned properly through the year; 53 regular weekly measurements and 55 on-demand measurements at arbitrary timings. Each measurement consisted of 11 successive acoustic rangings. The buoy tended to drift far from the preferred position for GPS-acoustic measurement, i.e., the center of the seafloor transponder array, due to strong current. The accuracy of the GPS-acoustic positioning achieved ∼46 cm (2σ) even only with “a single ranging” when the buoy was inside the array, while it degraded to ∼1.0 m when the buoy was outside the array. Although the 1.0 m accuracy is a detectable level of possible displacement due to a M8-class earthquake in the source region, further improvement to keep the drifting range smaller despite the current will enhance the utilization of the system.

  55. Along-arc heterogeneity of the seismic structure around a large coseismic shallow slip area of the 2011 Tohoku-oki Earthquake: 2-D Vp structural estimation through an airgun-ocean bottom seismometer experiment in the Japan Trench subduction zone Peer-reviewed

    Azuma R, R. Hino, Y. Ohta, Y. Ito, K. Mochizuki, K. Uehira, Y. Murai, T. Sato, T. Takanami, M. Shinohara, T. kanazawa

    J. Geophys. Res.　123　(6)　5249-5264　2018/06

    DOI： 10.1029/2017JB015361 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  56. Real-Time GNSS Analysis System REGARD: An Overview and Recent Results Peer-reviewed

    Kawamoto, Satoshi, Takamatsu, Naofumi, Abe, Satoshi, Miyagawa, Kohei, Ohta, Yusaku, Todoriki, Masaru, Nishimura, Takuya

    Journal of Disaster Research　13　(3)　440-452　2018/06

    DOI： 10.20965/jdr.2018.p0440 　

  57. Role of real-time GNSS in near-field tsunami forecasting Peer-reviewed

    Ohta Y, T. Inoue, S. Koshimura, S. Kawamoto, R. Hino

    J. Disaster Res.　13　(3)　453-459　2018/06

    DOI： 10.20965/jdr.2018.p0453 　

    ISSN： 1881-2473

    eISSN： 1883-8030

  58. Real-time tsunami inundation forecast system for tsunami disaster prevention and mitigation Peer-reviewed

    Akihiro Musa, Osamu Watanabe, Hiroshi Matsuoka, Hiroaki Hokari, Takuya Inoue, Yoichi Murashima, Yusaku Ohta, Ryota Hino, Shunichi Koshimura, Hiroaki Kobayashi

    Journal of Supercomputing　1-21　2018/04/16

    Publisher: Springer New York LLC

    DOI： 10.1007/s11227-018-2363-0 　

    ISSN： 1573-0484 0920-8542

  59. Tsunami inundation and damage forecasting with high-performance computing infrastructure

    S. Koshimura, Y. Murashima, A. Musa, R. Hino, Y. Ohta, H. Kobayashi, M. Kachi, Y. Sato

    11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy　6　3423-3427　2018

    Publisher: Earthquake Engineering Research Institute

  60. Special Issue on Application of GNSS for Mitigating Natural Disaster

    Kato, Teruyuki, Ohta, Yusaku, Munekane, Hiroshi

    Journal of Disaster Research　13　(3)　423-423　2018

  61. Magma Accumulation estimated by GNSS continuous observation in Kirishima

    Nakao S., Morita Y., Yakiwara H., Hirano S., Takahashi H., Ohta Y., Matsushima T., Iguchi M.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2018　11-11　2018

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2018.0_11 　

    ISSN： 2433-5320

    eISSN： 2189-7190

  62. Seafloor geodetic observations to reveal co- and postseismic slip distributions of the 2011 Tohoku-Oki earthquake Peer-reviewed

    Tomita, F, Y. Ohta, T. Iinuma, R. Hino, M. Kido, N. Uchida

    2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)　1-4　2018

    DOI： 10.1109/OCEANSKOBE.2018.8559370 　

  63. Advances of tsunami inundation forecasting and its future perspectives Peer-reviewed

    Shunichi Koshimura, Ryota Hino, Yusaku Ohta, Hiroaki Kobayashi, Yoichi Murashima, Akihiro Musa

    OCEANS 2017 - Aberdeen　2017-　1-4　2017/10/25

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/OCEANSE.2017.8084753 　

  64. Transient rheology of the oceanic asthenosphere following the 2012 Indian Ocean Earthquake inferred from geodetic data Peer-reviewed

    Cecep Pratama, Takeo Ito, Ryohei Sasajima, Takao Tabei, Fumiaki Kimata, Endra Gunawan, Yusaku Ohta, Tadashi Yamashina, Nazli Ismail, Irwandi Nurdin, Didik Sugiyanto, Umar Muksin, Irwan Meilano

    JOURNAL OF ASIAN EARTH SCIENCES　147　(147)　50-59　2017/10

    DOI： 10.1016/j.jseaes.2017.07.049 　

    ISSN： 1367-9120

    eISSN： 1878-5786

  65. Along-trench variation in seafloor displacements after the 2011 Tohoku earthquake Peer-reviewed

    Fumiaki Tomita, Motoyuki Kido, Yusaku Ohta, Takeshi Iinuma, Ryota Hino

    SCIENCE ADVANCES　3　(7)　e1700113　2017/07

    DOI： 10.1126/sciadv.1700113 　

    ISSN： 2375-2548

  66. REGARD: A new GNSS-based real-time finite fault modeling system for GEONET Peer-reviewed

    Satoshi Kawamoto, Yusaku Ohta, Yohei Hiyama, Masaru Todoriki, Takuya Nishimura, Tomoaki Furuya, Yudai Sato, Toshihiro Yahagi, Kohei Miyagawa

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　122　(2)　1324-1349　2017/02

    DOI： 10.1002/2016JB013485 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  67. Small-scale rheological heterogeneity controlled postseismic deformation of the 2011 Tohoku-oki earthquake

    Jun Muto, Bunichiro Shibazaki, Takeshi Iinuma, Yoshihiro Ito, Yusaku Ohta, Satoshi Miura, Yoshihiko Nakai

    ICF 2017 - 14th International Conference on Fracture　1　421-422　2017

  68. Rapid Tsunami Inundation and Damage Estimation System with High-performance Computing and Networking Peer-reviewed

    Shunichi Koshimura, Yoichi Murashima, Akihiro Musa, Ryota Hino, Yusaku Ohta, Hiroaki Kobayashi, Masahiro Kachi, Yoshihiro Sato

    Proceedings of International Tsunami Symposium 2017　2017

  69. Development and assessment of real-time fault model estimation routines in the GEONET real-time processing system Peer-reviewed

    Satoshi Kawamoto, Kohei Miyagawa, Toshihiro Yahagi, Masaru Todoriki, Takuya Nishimura, Yusaku Ohta, Ryota Hino, Satoshi Miura

    International Association of Geodesy Symposia　145　89-96　2017

    Publisher: Springer Verlag

    DOI： 10.1007/1345_2015_49 　

    ISSN： 0939-9585

  70. Rheological structure beneath NE Japan inferred fromcoseismic strain anomalies associated with the 2011 Tohoku-oki earthquake (MW9.0) Peer-reviewed

    Yasuo Yabe, Jun Muto, Mako Ohzono, Yusaku Ohta, Takeshi Iinuma

    International Association of Geodesy Symposia　145　63-71　2017

    DOI： 10.1007/1345_2015_135 　

    ISSN： 0939-9585

  71. Interplate coupling in and around the rupture area of the 2011 Tohoku earthquake (M9.0) before its occurrence based on terrestrial and seafloor geodetic observations Peer-reviewed

    Takeshi Iinuma, Ryota Hino, Motoyuki Kido, Yusaku Ohta, Satoshi Miura

    International Association of Geodesy Symposia　145　11-18　2017

    Publisher: Springer Verlag

    DOI： 10.1007/1345_2015_48 　

    ISSN： 0939-9585

  72. Buoy platform development for observation of tsunami and crustal deformation Peer-reviewed

    Narumi Takahashi, Yasuhisa Ishihara, Tatsuya Fukuda, Hiroshi Ochi, Jun’ichiro Tahara, Takami Mori, Mitsuyasu Deguchi, Motoyuki Kido, Yusaku Ohta, Ryota Hino, Katsuhiko Mutoh, Gosei Hashimoto, Osamu Motohashi, Yoshiyuki Kaneda

    International Association of Geodesy Symposia　145　97-103　2017

    Publisher: Springer Verlag

    DOI： 10.1007/1345_2015_114 　

    ISSN： 0939-9585

  73. Improvement in the accuracy of real-time GPS/acoustic measurements using a multi-purpose moored buoy system by removal of acoustic multipath Peer-reviewed

    Misae Imano, Motoyuki Kido, Yusaku Ohta, Tatsuya Fukuda, Hiroshi Ochi, Narumi Takahashi, Ryota Hino

    International Association of Geodesy Symposia　145　105-113　2017

    Publisher: Springer Verlag

    DOI： 10.1007/1345_2015_192 　

    ISSN： 0939-9585

  74. Geodetic and geomorphic evaluations of earthquake generation potential of the northern Sumatran fault, Indonesia Peer-reviewed

    Takao Tabei, Fumiaki Kimata, Takeo Ito, Endra Gunawan, Hiroyuki Tsutsumi, Yusaku Ohta, Tadashi Yamashina, Yoshio Soeda, Nazli Ismail, Irwandi Nurdin, Didik Sugiyanto, Irwan Meilano

    International Association of Geodesy Symposia　145　21-28　2017

    Publisher: Springer Verlag

    DOI： 10.1007/1345_2015_200 　

    ISSN： 0939-9585

  75. Coseismic slip model of offshore moderate interplate earthquakes on March 9, 2011 in Tohoku using tsunami waveforms Peer-reviewed

    Tatsuya Kubota, Ryota Hino, Daisuke Inazu, Yoshihiro Ito, Takeshi Iinuma, Yusaku Ohta, Syuichi Suzuki, Kensuke Suzuki

    EARTH AND PLANETARY SCIENCE LETTERS　458　241-251　2017/01

    DOI： 10.1016/j.epsl.2016.10.047 　

    ISSN： 0012-821X

    eISSN： 1385-013X

  76. Assessment of GNSS-based height data of multiple ships for measuring and forecasting great tsunamis Peer-reviewed

    Daisuke Inazu, Takuji Waseda, Toshiyuki Hibiya, Yusaku Ohta

    Geoscience Letters　3　(1)　2016/12/01

    Publisher: SpringerOpen

    DOI： 10.1186/s40562-016-0059-y 　

    ISSN： 2196-4092

  77. Spatial and temporal characteristics of optimum process noise values of tropospheric parameters for kinematic analysis of Global Navigation Satellite System (GNSS) sites in Japan Peer-reviewed

    Yu'ichiro Hirata, Yusaku Ohta

    EARTH PLANETS AND SPACE　68　(203)　2016/12

    DOI： 10.1186/s40623-016-0578-y 　

    ISSN： 1880-5981

  78. GNSSによるリアルタイム断層推定情報の津波解析への適用手法の検討 Peer-reviewed

    井上拓也, 太田雄策, 越村俊一, 日野亮太, 川元智司, 檜山洋平, 道家友紀

    海岸工学論文集　72　(2)　355-360　2016/11

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/kaigan.72.I_355 　

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    &nbsp;Applicability of rapidly estimated fault models based on real-time GNSS to tsunami simulation was examined, in comparison to tsunami survey data in 2011 off the Pacific coast of Tohoku Earthquake. GNSS models could show acceptable reproducibility in terms of tsunami height along the Pacific coast except the ria coast in Sanriku where considerably high tsunami observed in 2011. Tsunami inundation for lowland was fairly modeled by GNSS models in the case of city areas facing the Ishinomaki Bay. We also proposed a new method for rapidly estimating initial tsunami height from a slip distribution model that consists of a number of triangular sub-faults through approximation to a set of rectangular sub-faults.

  79. 緊急地震速報を用いた二段階多数津波シナリオ解析による最悪シナリオ即時推定 Peer-reviewed

    古屋敬士, 越村俊一, 日野亮太, 太田雄策, 井上拓也

    土木学会論文集B2 (海岸工学)　72　(2)　307-312　2016/11

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/kaigan.72.I_307 　

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    &nbsp;In recent years, real-time tsunami inundation forecasting has been developed with the modern computing power and earthquake tsunami observation system. However, uncertainties in tsunami source model derived from fault model may cause underestimation of tsunami damage. To prevent it, from disaster management point of view, we aim to determine the worst tsunami scenario, using seismic information of Earthquake Early Warning (EEW) that can be obtained after the event triggered. The method was applied to 60 cases of a hypothetical-earthquake, and verified that the method can effectively search the maximum tsunami height that may be happened as the worst tsunami scenario in 3 minutes.

  80. First result from the GEONET real-time analysis system (REGARD): the case of the 2016 Kumamoto earthquakes Peer-reviewed

    Satoshi Kawamoto, Yohei Hiyama, Yusaku Ohta, Takuya Nishimura

    EARTH PLANETS AND SPACE　68　(190)　2016/11

    DOI： 10.1186/s40623-016-0564-4 　

    ISSN： 1880-5981

  81. リアルタイム・キネマティックGNSSデータ解析の高度化およびそれにもとづく巨大地震の震源断層即時推定手法に関する研究 Invited Peer-reviewed

    太田雄策

    測地学会誌　62　(1)　1-19　2016/07

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi.62.1 　

    ISSN： 0038-0830

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    <p>GNSS is strong and common observation tool for understanding the spatial and temporal development of crustal deformation. The one of the advantage of GNSS is the high dynamic range with broadband characteristic. Based on these characteristics, various studies developed the quasi realtime coseismic fault determination method deduced from the real-time GNSS data. Crustal deformation due to coseismic slips at an earthquake fault detected by real-time GNSS analysis is quite useful in estimating fault expansion and the amount of its slip. It in turn contributes to rapid tsunami warning for near field coast, even though the huge interplate earthquakes such as larger than the magnitude 9 event. This paper summarizes the author's past research on improvement and its comprehensive noise assessment of real-time kinematic GNSS analysis and development of rapid coseismic fault determination technique based on those data. The author also reviews recent development status on crustal deformation monitoring system in Japan, which have been jointly developed by Geospatial Information Authority of Japan and Tohoku University. Furthermore, the author also discusses a future direction of the real-time crustal deformation monitoring and near field tsunami early warning system based on the GNSS data.</p>

  82. Heterogeneous rheology controlled postseismic deformation of the 2011 Tohoku-Oki earthquake Peer-reviewed

    Jun Muto, Bunichiro Shibazaki, Takeshi Iinuma, Yoshihiro Ito, Yusaku Ohta, Satoshi Miura, Yoshihiko Nakai

    GEOPHYSICAL RESEARCH LETTERS　43　(10)　4971-4978　2016/05

    DOI： 10.1002/2016GL068113 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  83. Co-seismic offsets due to two earthquakes (M-w 6.1) along the Sumatran fault system derived from GNSS measurements Peer-reviewed

    Takeo Ito, Endra Gunawan, Fumiaki Kimata, Takao Tabei, Irwan Meilano, Agustan, Yusaku Ohta, Nazli Ismail, Irwandi Nurdin, Didik Sugiyanto

    EARTH PLANETS AND SPACE　68　(57)　2016/04

    DOI： 10.1186/s40623-016-0427-z 　

    ISSN： 1880-5981

  84. Investigation on the Postseismic Deformation Associated with the 2011 Tohoku Earthquake Based on Terrestrial and Seafloor Geodetic Observations: To Evaluate the Further Seismic Hazard Potential on the Plate Interface Beneath the Northeastern Japanese Islands Peer-reviewed

    Takeshi Iinuma, Ryota Hino, Motoyuki Kido, Yukihito Osada, Daisuke Inazu, Yoshihiro Ito, Syuichi Suzuki, Yusaku Ohta, Hiromi Fujimoto

    IAG 150 YEARS　143　459-466　2016

    DOI： 10.1007/1345_2015_162 　

    ISSN： 0939-9585

  85. Rapid coseismic fault determination of consecutive large interplate earthquakes: The 2011 tohoku-oki sequence Invited Peer-reviewed

    Yusaku Ohta, Tatsuya Kobayashi, Ryota Hino, Tomotsugu Demachi, Satoshi Miura

    International Association of Geodesy Symposia　467-475　2016

    Publisher: Springer Verlag

    DOI： 10.1007/1345_2015_109 　

    ISSN： 0939-9585

  86. First measurement of the displacement rate of the Pacific Plate near the Japan Trench after the 2011 Tohoku-Oki earthquake using GPS/acoustic technique Peer-reviewed

    Fumiaki Tomita, Motoyuki Kido, Yukihito Osada, Ryota Hino, Yusaku Ohta, Takeshi Iinuma

    GEOPHYSICAL RESEARCH LETTERS　42　(20)　8391-8397　2015/10

    DOI： 10.1002/2015GL065746 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  87. Advective diffusion of volcanic plume captured by dense GNSS network around Sakurajima volcano: a case study of the vulcanian eruption on July 24, 2012 Invited Peer-reviewed

    Yusaku Ohta, Masato Iguchi

    EARTH PLANETS AND SPACE　67　(1)　157　2015/09

    DOI： 10.1186/s40623-015-0324-x 　

    ISSN： 1880-5981

  88. The effects of compressibility on the GIA in southeast Alaska Peer-reviewed

    Yoshiyuki Tanaka, Tadahiro Sato, Yusaku Ohta, Satoshi Miura, Jeffrey T. Freymueller, Volker Klemann

    JOURNAL OF GEODYNAMICS　84　55-61　2015/03

    DOI： 10.1016/j.jog.2014.10.001 　

    ISSN： 0264-3707

  89. Achievement of the Project for Advanced GPS/Acoustic Survey in the Last Four Years Peer-reviewed

    Kido M, H. Fujimoto, R. Hino, Y. Ohta, Y. Osada, T. Iinuma, R. Azuma, I. Wada, S. Miura, S. Suzuki, F. Tomita, M. Imano

    International Association of Geodesy Symposia　2015/03

    DOI： 10.1007/1345_2015_127 　

  90. Real-time tsunami inundation forecasting and damage estimation method by fusion of real-time crustal deformation monitoring and high-performance computing Peer-reviewed

    S. Koshimura, R. Hino, Y. Ohta, H. Kobayashi, A. Musa, Y. Murashima

    the 26th International Union of Geodesy and Geophysics　2015

  91. Progress in the Project for Development of GPS/Acoustic Technique Over the Last 4 Years Peer-reviewed

    Kido, M, H. Fujimoto, R. Hino, Y. Ohta, Y. Osada, T. Iinuma, R. Azuma, I. Wada, S. Miura, S. Suzuki, F. Tomita, M, Imano

    International Association of Geodesy Symposia　2015

  92. Prevalence of viscoelastic relaxation after the 2011 Tohoku-oki earthquake Peer-reviewed

    Tianhaozhe Sun, Kelin Wang, Takeshi Iinuma, Ryota Hino, Jiangheng He, Hiromi Fujimoto, Motoyuki Kido, Yukihito Osada, Satoshi Miura, Yusaku Ohta, Yan Hu

    NATURE　514　(7520)　84-+　2014/10

    DOI： 10.1038/nature13778 　

    ISSN： 0028-0836

    eISSN： 1476-4687

  93. Development of visualization tool for real-time GNSS time series Peer-reviewed

    出町知嗣, 太田雄策, 三浦 哲, 立花憲司, 佐藤俊也, 日野亮太

    測地学会誌　60　(3)　99-104　2014/10

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi.60.99 　

    ISSN： 0038-0830

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    We developed a visualization tool of real-time GNSS time-series for the real-time crustal deformation monitoring. The developed system can draw the real-time GNSS time-series based on the user requirement in Web browser. The user can change drawing range of the time-series by graphical user interface. The drawn time-series is update automatically based on the processed GNSS time-series. These features will be useful for the actual crustal deformation monitoring by the realtime GNSS processing.

  94. Was the 2011 Tohoku-Oki earthquake preceded by aseismic preslip? Examination of seafloor vertical deformation data near the epicenter Peer-reviewed

    R. Hino, D. Inazu, Y. Ohta, Y. Ito, S. Suzuki, T. Iinuma, Y. Osada, M. Kido, H. Fujimoto, Y. Kaneda

    MARINE GEOPHYSICAL RESEARCH　35　(3)　181-190　2014/09

    DOI： 10.1007/s11001-013-9208-2 　

    ISSN： 0025-3235

    eISSN： 1573-0581

  95. Seismic velocity changes caused by the Earth tide: Ambient noise correlation analyses of small-array data Peer-reviewed

    Tomoya Takano, Takeshi Nishimura, Hisashi Nakahara, Yusaku Ohta, Sachiko Tanaka

    GEOPHYSICAL RESEARCH LETTERS　41　(17)　6131-6136　2014/09

    DOI： 10.1002/2014GL060690 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  96. New buoy observation system for tsunami and crustal deformation Peer-reviewed

    Narumi Takahashi, Yasuhisa Ishihara, Hiroshi Ochi, Tatsuya Fukuda, Jun'ichiro Tahara, Yosaku Maeda, Motoyuki Kido, Yusaku Ohta, Katsuhiko Mutoh, Gosei Hashimoto, Satoshi Kogure, Yoshiyuki Kaneda

    MARINE GEOPHYSICAL RESEARCH　35　(3)　243-253　2014/09

    DOI： 10.1007/s11001-014-9235-7 　

    ISSN： 0025-3235

    eISSN： 1573-0581

  97. A comprehensive model of postseismic deformation of the 2004 Sumatra-Andaman earthquake deduced from GPS observations in northern Sumatra Peer-reviewed

    Endra Gunawan, Takeshi Sagiya, Takeo Ito, Fumiaki Kimata, Takao Tabei, Yusaku Ohta, Irwan Meilano, Hasanuddin Z. Abidin, Agustan, Irwandi Nurdin, Didik Sugiyanto

    JOURNAL OF ASIAN EARTH SCIENCES　88　218-229　2014/07

    DOI： 10.1016/j.jseaes.2014.03.016 　

    ISSN： 1367-9120

    eISSN： 1878-5786

  98. 海陸統合測地観測に基づく2011年東北地方太平洋沖地震に関する研究 Peer-reviewed

    藤本博己, 日野亮太, 木戸元之, 伊藤喜宏, 太田雄策, 飯沼卓史, 長田幸仁, 稲津大祐, 鈴木秀市, 佐藤俊也, 立花憲司, 出町知嗣, 三浦哲

    測地学会誌　60　(1)　1-22　2014/05

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi.60.1 　

    ISSN： 0038-0830

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    The geodetic research group of Tohoku University has been carrying out geodetic observations on shore and off shore of Miyagi Prefecture where earthquakes around M7.5 repeatedly occurred at intervals of about 40 years. We have been measuring horizontal movements of seafloor geodetic stations since 2003, using GPS-Acoustic （GPSA） seafloor positioning systems. We have also been continuously observing vertical crustal movements since 2008 using free-fall/pop-up ocean bottom pressure recorders （OBPRs）. Owing to these geodetic observations that were made in the region above the rupture area of the 2011 M9.0 Tohoku-oki earthquake, we succeeded in detecting unexpectedly large coseismic crustal displacements that had never been measured with geodetic systems on the seafloor. We retrieved data from the OBPRs that had been deployed above the rupture area, and to continue monitoring gradual postseismic slips, we installed replacements for these OBPRs at the same observation sites. We presented a model for the coseismic slip distribution on the plate boundary, and it is widely referenced because it is a model that is constrained by the OBPR data as well as the GPSA and the terrestrial geodetic data. We have also developed a method of real-time kinematic analyses of the data from a GNSS array to estimate the approximate magnitude of large earthquakes within several minutes. We developed a procedure to reduce tidal and non-tidal oceanic components in OBPR data. The pressure data analyzed jointly with onshore strain data revealed that there was a slow slip event near the focal zone about one month before the main event. The observed pressure variations also contain information about the coseismic and postseismic crustal movements associated with the M7.3 earthquake that occurred on March 9 and was estimated to be the largest foreshock. These results are important for clarifying geophysical processes that preceded the giant earthquake.

  99. tFISH/RAPiD: Rapid improvement of near-field tsunami forecasting based on offshore tsunami data by incorporating onshore GNSS data Peer-reviewed

    Hiroaki Tsushima, Ryota Hino, Yusaku Ohta, Takeshi Iinuma, Satoshi Miura

    GEOPHYSICAL RESEARCH LETTERS　41　(10)　3390-3397　2014/05

    DOI： 10.1002/2014GL059863 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  100. 国際測地学協会2013年学術総会報告

    日置幸介, 飯沼卓史, 市川隆一, 太田雄策, 大坪利通, 鷺谷 威, 島田誠一, 橋本 学, 福島登志夫, 福田洋一, ホビガー トーマス, 宗包浩志

    測地学会誌　59　(4)　167-180　2014/04

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi.59.167 　

    ISSN： 0038-0830

  101. Study of the 2011 off the pacific coast of Tohoku earthquake based on seafloor and terrestrial geodetic observation

    Hiromi Fujimoto, Ryota Hino, Motoyuki Kido, Yoshihiro Ito, Yusaku Ohta, Takeshi Iinuma, Yukihito Osada, Daisuke Inazu, Syuichi Suzuki, Toshiya Sato, Kenji Tachibana, Tomotsugu Demachi, Satoshi Miura

    Journal of the Geodetic Society of Japan　60　(1)　1-22　2014/01/01

    Publisher: Geodetic Society of Japan

    ISSN： 0038-0830

  102. Real-time tsunami inundation forecasting and damage mapping towards enhancing tsunami disaster resilience Peer-reviewed

    S. Koshimura, R. HIno, Y. Ohta, H. Kobayashi, A. Musa, Y.Murashima

    American Geophysical Union Fall Meeting　2014

  103. Review on near-field tsunami forecasting from offshore tsunami data and onshore GNSS data for tsunami early warning Invited Peer-reviewed

    Hiroaki Tsushima, Yusaku Ohta

    Journal of Disaster Research　9　(3)　339-357　2014

    Publisher: Fuji Technology Press

    DOI： 10.20965/jdr.2014.p0339 　

    ISSN： 1883-8030 1881-2473

  104. Mechanism of small vulcanian eruptions at Suwanosejima volcano, Japan, as inferred from precursor inflations and tremor signals Peer-reviewed

    Takeshi Nishimura, Masato Iguchi, Hiroshi Yakiwara, Jun Oikawa, Ryohei Kawaguchi, Hiroshi Aoyama, Haruhisa Nakamichi, Yusaku Ohta, Takeshi Tameguri

    BULLETIN OF VOLCANOLOGY　75　(12)　2013/12

    DOI： 10.1007/s00445-013-0779-1 　

    ISSN： 0258-8900

    eISSN： 1432-0819

  105. Ocean bottom pressure records of the 2011 Tohoku-Oki earthquake Peer-reviewed

    Hino, R, Y. Ito, Y. Ohta, T. Iinuma, D. Inazu

    Proceedings of the 11th SEGJ International Symposium　462-465　2013/11

  106. 衛星通信を活用したリアルタイムGPS解析 −地上通信障害時に地殻変動を実時間で把握するために− Peer-reviewed

    山本淳平, 長田幸仁, 太田雄策, 平原 聡, 出町知嗣, 中山貴史, 立花憲司, 佐藤俊也, 木戸元之, 藤本博己, 日野亮太, 三浦 哲, 内田雅之

    測地学会誌　59　(4)　133-145　2013/10

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi.59.133 　

    ISSN： 0038-0830

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    The redundant communication pathway and processing strategy for satellite navigation system such as GPS is extremely important for more reliable quasi real-time crustal deformation monitoring in case of huge interplate earthquake occurrence. We tested real-time kinematic GPS processing (RTK-GPS) via satellite-based mobile phone for redundant communication pathway for address the vulnerabilities of the infrastructure. We succeed to get the stable time series via satellite mobile phone network with almost zero-missing data for short and long baseline RTK-GPS. We also assessed stability, precision and accuracy of StarFireTM global satellites based augmentation system for redundant processing strategy. In order to assess coordinate precision and accuracy, we compared 1Hz StarFire time series and post-processed precise point positioning (PPP) 1Hz time series by GIPSY-OASIS II processing software Ver. 6.1.2 with three different product types (ultrarapid, rapid, and final orbits). We also used different interval clock information (30 and 300 seconds) for the post-processed PPP processing. The standard deviation of real time StarFire time series is less than 30 mm (horizontal components) and 60 mm (vertical component) based on 1 month continuous processing. We also assessed noise spectrum of the estimated time series by StarFire and post-processed GIPSY PPP results. We found that the noise spectrum of StarFire time series is similar pattern with GIPSY-OASIS II processing result based on JPL rapid orbit products with 300 seconds interval clock information. Based on these stability and noise assessment, we suggest that the various communication pathways for RTK-GPS processing and various processing strategy such as global satellites based augmentation system with traditional RTK-GPS processing strategy is important for more reliable quasi real-time crustal deformation monitoring.

  107. Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake Peer-reviewed

    Yoshihiro Ito, Ryota Hino, Motoyuki Kido, Hiromi Fujimoto, Yukihito Osada, Daisuke Inazu, Yusaku Ohta, Takeshi Iinuma, Mako Ohzono, Satoshi Miura, Masaaki Mishina, Kensuke Suzuki, Takeshi Tsuji, Juichiro Ashi

    TECTONOPHYSICS　600　14-26　2013/07

    DOI： 10.1016/j.tecto.2012.08.022 　

    ISSN： 0040-1951

    eISSN： 1879-3266

  108. Characteristics of volcanic activity at Sakurajima volcano’s Showa crater during the period 2006 to 2011 Peer-reviewed

    Iguchi, M, T. Tameguri, Y. Ohta, S. Ueki, S. Nakao

    Bull. Volcanol. Soc. Japan　58　(1)　115-135　2013/04

    DOI： 10.18940/kazan.58.1_115 　

  109. Real time GPS processing utilizing satellite communications -Toward more reliable real-time crustal deformation monitoring under a situation of ground communication failure-

    Jyunpei Yamamoto, Yukihito Osada, Yusaku Ohta, Satoshi Hirahara, Tomotsugu Demachi, Takashi Nakayama, Kenji Tachibana, Toshiya Sato, Motoyuki Kido, Hiromi Fujimoto, Ryota Hino, Satoshi Miura, Masayuki Uchida

    Journal of the Geodetic Society of Japan　59　(4)　133-145　2013

    Publisher: Geodetic Society of Japan

    ISSN： 0038-0830

  110. Volume change of the magma reservoir relating to the 2011 Kirishima Shinmoe-dake eruption-Charging, discharging and recharging process inferred from GPS measurements Peer-reviewed

    Shigeru Nakao, Yuichi Morita, Hiroshi Yakiwara, Jun Oikawa, Hideki Ueda, Hiroaki Takahashi, Yusaku Ohta, Takeshi Matsushima, Masato Iguchi

    EARTH PLANETS AND SPACE　65　(6)　505-515　2013

    DOI： 10.5047/eps.2013.05.017 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  111. Geodetic constraints on afterslip characteristics following the March 9, 2011, Sanriku-oki earthquake, Japan Peer-reviewed

    Yusaku Ohta, Ryota Hino, Daisuke Inazu, Mako Ohzono, Yoshihiro Ito, Masaaki Mishina, Takeshi Iinuma, Junichi Nakajima, Yukihito Osada, Kensuke Suzuki, Hiromi Fujimoto, Kenji Tachibana, Tomotsugu Demachi, Satoshi Miura

    GEOPHYSICAL RESEARCH LETTERS　39　(L16304)　1-6　2012/08

    DOI： 10.1029/2012GL052430 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  112. Isolating along-strike variations in the depth extent of shallow creep and fault locking on the northern Great Sumatran Fault Peer-reviewed

    Takeo Ito, Endra Gunawan, Fumiaki Kimata, Takao Tabei, Mark Simons, Irwan Meilano, Agustan, Yusaku Ohta, Irwandi Nurdin, Didik Sugiyanto

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　117　(B06409)　2012/06

    DOI： 10.1029/2011JB008940 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  113. 隣接観測点の情報を用いたRTK-GPSによる地震時永久変位自動検知アルゴリズムの改良 Peer-reviewed

    小林竜也, 太田雄策, 三浦哲, 日野亮太, 藤本博己, 出町知嗣, 立花憲司

    測地学会誌　58　(2)　77-87　2012/04

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi.58.77 　

    ISSN： 0038-0830

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    We assessed the performance of a permanent displacement detection algorithm, which was developed by the authors at previous study, by using long-term Real Time Kinematic-GPS（RTK-GPS）data processing. False detection of permanent displacement should be avoided for a reliable warning system. We examined the detection rate using RTK-GPS time series with various baselines and different reference sites for a long time period. The false detection rate was ∼0.25% with a 4 sigma confidence level for a single baseline. This false detection rate is inadequate for practical use in a large GPS network consisting of many stations, such as GEONET. We improved the permanent displacement detection algorithm to mitigate the false detection rate. In the improved algorithm, an earthquake occurrence is defined as when the target GPS site and all its neighboring GPS sites detect a displacement. We applied the improved algorithm to an actual data set. With our improved algorithm, the false detection rate decreases to less than 0.002%. When we can use several reference sites for the RTK-GPS data processing and compare results for each reference site, the false detection rate will become almost zero. The improved algorithm is also useful for the detection of small displacements, because it may be possible to lower a threshold value from 4 to 2 sigma while keeping the false detection level to acceptable limit.

  114. Quasi real-time fault model estimation for near-field tsunami forecasting based on RTK-GPS analysis: Application to the 2011 Tohoku-Oki earthquake (M-w 9.0) Peer-reviewed

    Yusaku Ohta, Tatsuya Kobayashi, Hiroaki Tsushima, Satoshi Miura, Ryota Hino, Tomoji Takasu, Hiromi Fujimoto, Takeshi Iinuma, Kenji Tachibana, Tomotsugu Demachi, Toshiya Sato, Mako Ohzono, Norihito Umino

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　117　2012/02

    DOI： 10.1029/2011JB008750 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  115. Seismic Array Observation Close to the Active Crater at Suwanose-jima Volcano, Southwest Japan for the Period from October to November 2010

    NAKAMICHI HARUHISA, AOYAMA HIROSHI, NISHIMURA TAKESHI, YAKIWARA HIROSHI, OTA YUSAKU, YOKOO AKIHIKO, IGUCHI MASATO

    京都大学防災研究所年報(CD-ROM)　(56)　227-235　2012

    Publisher:

    ISSN： 0386-412X

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    We conducted a small-aperture seismic array observation at Suwanose-jima volcano for the period from 1 October to 18 November 2010. The seismic array consists of 13 elements of short-period seismometers and 5 data loggers. We perform array analysis for continuous seismic records observed during this period to investigate the wave-field properties of several episodes of volcanic tremors and 30 explosion earthquakes. Averages of the slowness values and back azimuths of volcanic tremors are estimated to be 0.8-1.4 s/km and 0°-40°, respectively. This suggests that the tremor wave consists of body and surface waves that propagate from the active crater. The array analyses and particle motions of explosion earthquakes indicate that the initial parts of the waveforms of explosion earthquakes are S waves that come from the direction of the active crater. The slowness values of the S waves of the explosion earthquakes are 0.3-0.5 s/km. Variation of the slowness value reflects the depth change of the explosion sources.

  116. Strain anomalies induced by the 2011 Tohoku Earthquake (M-w 9.0) as observed by a dense GPS network in northeastern Japan Peer-reviewed

    Mako Ohzono, Yasuo Yabe, Takeshi Iinuma, Yusaku Ohta, Satoshi Miura, Kenji Tachibana, Toshiya Sato, Tomotsugu Demachi

    EARTH PLANETS AND SPACE　64　(12)　1231-1238　2012

    DOI： 10.5047/eps.2012.05.015 　

    ISSN： 1343-8832

  117. Gravity and uplift rates observed in southeast Alaska and their comparison with GIA model predictions Peer-reviewed

    Tadahiro Sato, Satoshi Miura, Wenke Sun, Takayuki Sugano, Jeffrey T. Freymueller, Christopher F. Larsen, Yusaku Ohta, Hiromi Fujimoto, Daisuke Inazu, Roman J. Motyka

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　117　(B01401)　2012/01

    DOI： 10.1029/2011JB008485 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  118. Geodetic evidence of viscoelastic relaxation after the 2008 Iwate-Miyagi Nairiku earthquake Peer-reviewed

    Mako Ohzono, Yusaku Ohta, Takeshi Iinuma, Satoshi Miura, Jun Muto

    EARTH PLANETS AND SPACE　64　(9)　759-764　2012

    DOI： 10.5047/eps.2012.04.001 　

    ISSN： 1343-8832

  119. Reevaluation of the viscoelastic and elastic responses to the past and present-day ice changes in Southeast Alaska Peer-reviewed

    Tadahiro Sato, Christopher F. Larsen, Satoshi Miura, Yusasku Ohta, Hiromi Fujimoto, Wenke Sun, Roman J. Motyka, Jeffrey T. Freymueller

    TECTONOPHYSICS　511　(3-4)　79-88　2011/11

    DOI： 10.1016/j.tecto.2010.05.009 　

    ISSN： 0040-1951

    eISSN： 1879-3266

  120. Evaluation of Volcanic Activity of Sakurajima Volcano in 2010

    IGUCHI M.

    Annuals of Disas. Prev. Res. Inst., Kyoto Univ.　54　(0)　171-183　2011/10/20

    Publisher:

    ISSN： 0386-412X

  121. P27 Short-lived ground deformations observed at Iwate volcano in the period of Oct., 2009 - Jun., 2010

    Ueki S., Hirahara S., Nakayama T., Demachi T., Kono T., Tachibana K., Ohta Y., Zhao D.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2011　139-139　2011

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2011.0_139 　

  122. Coseismic slip distribution of the 2011 off the Pacific coast of Tohoku Earthquake (M 9.0) estimated based on GPS data-Was the asperity in Miyagi-oki ruptured? Peer-reviewed

    Takeshi Iinuma, Mako Ohzono, Yusaku Ohta, Satoshi Miura

    EARTH PLANETS AND SPACE　63　(7)　643-648　2011

    DOI： 10.5047/eps.2011.06.013 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  123. Large intraslab earthquake (2011 April 7, M 7.1) after the 2011 off the Pacific coast of Tohoku Earthquake (M 9.0): Coseismic fault model based on the dense GPS network data Peer-reviewed

    Yusaku Ohta, Satoshi Miura, Mako Ohzono, Saeko Kita, Takeshi Iinuma, Tomotsugu Demachi, Kenji Tachibana, Takashi Nakayama, Satoshi Hirahara, Syuichi Suzuki, Toshiya Sato, Naoki Uchida, Akira Hasegawa, Norihito Umino

    EARTH PLANETS AND SPACE　63　(12)　1207-1211　2011

    DOI： 10.5047/eps.2011.07.016 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  124. Development of the GPS Observation System using the Low-cost Dual-frequency GPS Receiver and Data Logger Peer-reviewed

    Yusaku Ohta, Satoshi Miura, Shinsuke Matsumura, Toshiyuki Mori

    Journal of the Geodetic Society of Japan　56　(3)　101-106　2010/11

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi.56.101 　

    ISSN： 0038-0830

    More details Close

    We developed a GPS observation system using the combination of a low-cost GNSS receiver and a LINUX data logger for the crustal deformation monitoring. We implemented three functions on the system. The first one is the data logging of GNSS streaming data, the second one is controlling the GNSS receiver, and the last one is conversion to RTCM format that is streamed by means of TCP/IP for RTK-GPS processing. We assessed the GPS data quality by two kinds of tests. At first, we checked the zero-baseline kinematic post-processing using 20Hz sampling data obtained by an expensive geodetic-level receiver and our newly developed system. The standard deviations of the resulting time series are 0.85 mm (EW), 1.17 mm (NS), and 1.62 mm (UD), respectively. Next, we tested the long-baseline (178.5 km) real-time kinematic analysis. We conclude that our new GPS observation system has functions and capabilities comparative to expensive geodetic-level receivers used for the crustal deformation monitoring with inexpensive costs.

  125. 桜島火山山腹におけるGPS連続観測点の増設(2009年度)

    太田雄策, 植木貞人, 井口正人

    「桜島 火山における多項目観測に基づく火山噴火準備過程解明のための研究」平成21年度分報告書　2010/09

  126. 3-A04 Ground Deformation in Frequent Eruptive Periods at Showa Crater of Sakurajima

    Iguchi Masato, Ohta Yusaku, Ueki Sadato, Sonoda Tadaomi, Takayama Tetsuro, Ichikawa Nobuo

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2010　36-36　2010

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2010.0_36 　

  127. Metal Detector Visualization System using RTK-GPS and its application to surveys in landslides by Iwate-Miyagi Nairiku Earthquake

    Motoyuki SATO, Antoine, PARISOD Takashi KIDO Satoshi MIURA, Yusaku OHTA

    信学技報 SANE2009-78　109　(72)　79-84　2009/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    17 people were killed and 6 people are-still missing by the Iwate-Miyagi Nairiku Earthquake occurred in June 2008. Most of the disaster were caused by landslides in mountain side in Miyagi prefecture, North Japan. In order to detect automobiles buried in deep soil, we developed a system combining a metal detector (EMI sensors) for UXO detection with RTK-GPS, which can visualize the metal detector response. Due to the high accuracy of the positioning by RTK-GPS, 3D visualization of the metal detector response on the steep slope of 50m in width by 150m in height at maximum 45 degree was obtained. We found that we can roughly identify the shape of the buried metal objects, and therefore we could discriminate larger objects from metal fragments such as reinforcement bars in concrete blocks. We identified three possible points where cars can be buried in that area.

  128. Aseismic slow slip on an inland active fault triggered by a nearby shallow event, the 2008 Iwate-Miyagi Nairiku earthquake (Mw6.8) Peer-reviewed

    T. Iinuma, M. Ohzono, Y. Ohta, S. Miura, M. Kasahara, H. Takahashi, T. Sagiya, T. Matsushima, S. Nakao, S. Ueki, K. Tachibana, T. Sato, H. Tsushima, K. Takatsuka, T. Yamaguchi, M. Ichiyanagi, M. Takada, K. Ozawa, M. Fukuda, Y. Asahi, M. Nakamoto, Y. Yamashita, N. Umino

    GEOPHYSICAL RESEARCH LETTERS　36　2009/10

    DOI： 10.1029/2009GL040063 　

    ISSN： 0094-8276

  129. Accurate ocean tide modeling in southeast Alaska and large tidal dissipation around Glacier Bay Peer-reviewed

    Daisuke Inazu, Tadahiro Sato, Satoshi Miura, Yusaku Ohta, Kazuyuki Nakamura, Hiromi Fujimoto, Christopher F. Larsen, Tomoyuki Higuchi

    JOURNAL OF OCEANOGRAPHY　65　(3)　335-347　2009/06

    DOI： 10.1007/s10872-009-0031-y 　

    ISSN： 0916-8370

  130. B02 Change in seismic activity preceding the opening of a new fumarole in November, 2008 at Azuma volcano

    Ueki S., Hirahara S., Nakayama T., Ohta Y., Zhao D.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2009　52-52　2009

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2009.0_52 　

  131. 10 Hz GPS受信機導入による海底地殻変動観測高度化の試み Peer-reviewed

    長田 幸仁, 水上 知子, 木戸 元之, 太田 雄策, 対馬 弘晃, 三浦 哲, 藤本 博己

    測地学会誌　54　(3)　141-151　2008/11

    DOI： 10.11366/sokuchi1954.54.141 　

  132. Earth tides observed by gravity and GPS in southeastern Alaska Peer-reviewed

    T. Sato, S. Miura, Y. Ohta, H. Fujimoto, W. Sun, C. F. Larsen, M. Heavner, A. M. Kaufman, J. T. Freymueller

    JOURNAL OF GEODYNAMICS　46　(3-5)　78-89　2008/10

    DOI： 10.1016/j.jog.2008.03.004 　

    ISSN： 0264-3707

  133. Movement of Magma at Sakurajima Volcano Revealed by GPS Observation

    井口正人, 高山鐵朗, 山崎友也, 多田光, 鈴木敦生, 植木貞人, 太田雄策, 中尾 茂

    Annuals of Disas. Prev. Res. Inst, Kyoto Univ.　(51B)　241-246　2008/06

    Publisher:

    ISSN： 0386-412X

  134. Post-seismic crustal movements derived from GPS observations due to the 2004 Sumatra-Andaman earthquake

    T.Kato, C.D.Reddy, S.K. Prajapati, F.Kimata, Agustan, I.Meilano, Y.Ohta, T.Ito, D.Darmawan, H.Andreas, H.Z.Abidin, M.A.Kusuma, D.Sugianto, T.Tabei, M.Satomura, P.Wu, M.Hashimoto

    Proceedings of the Inernational Symposium on the Restoration Program from Giant Earthquaeks and Tsunamis　2008/03

  135. Post-seismic Phase Duration of the 2004 Sumatra-Andaman Earthquake as Estimated from GPS Continuous Data

    H.Z.Abidin, I.Malra, H.Andreas, I.Meilano, F.Kimata, T.Ito, Y.Ohta, Agustan, D.Sugiyanto

    Proceedings of the Inernational Symposium on the Restoration Program from Giant Earthquaeks and Tsunamis　2008/03

  136. Seismic and Tsunami wave signal detection of the 2004 Sumatra- Andaman earthquake by high-rate kinematic GPS and broadband seismometer analysis

    Ohta.Y, K.Takatsuka, S.Miura, T.Sato

    Proceedings of Symposium on Giant Earthquakes and Tsunamis　1　(1)　135-140　2008/03

  137. Introduction of 10 Hz GPS receiver for the improved observation of seafloor crustal movement Peer-reviewed

    Osada, Y., Mizukami, T., Kido, M., Ohta, Y., Tsushima, H., Miura, S., Fujimoto, H.

    Journal of the Geodetic Society of Japan　54　(3)　2008

  138. B03 Seismic activity at Iwate volcano after the 1998 intrusive event

    Ueki S., Ohta Y., Zhao D., Hirahara S., Nakayama T., Nishimura T., Tanaka S.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2008　55-55　2008

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2008.0_55 　

  139. Postseismic slip associated with the 2007 Chuetsu-oki, Niigata, Japan, Earthquake (M 6.8 on 16 July 2007) as inferred from GPS data Peer-reviewed

    Iinuma, T., Ohta, Y., Miura, S., Tachibana, K., Matsushima, T., Takahashi, H., Sagiya, T., Ito, T., Miyazaki, S., Doke, R., Takeuchi, A., Miyao, K., Hirao, A., Maeda, T., Yamaguchi, T., Takada, M., Iwakuni, M., Ochi, T., Meilano, I., Hasegawa, A.

    Earth, Planets and Space　60　(11)　1087-1091　2008

    DOI： 10.1186/BF03353141 　

  140. Coseismic and postseismic deformation related to the 2007 Chuetsu-oki, Niigata Earthquake Peer-reviewed

    Ohta, Y., Miura, S., Iinuma, T., Tachibana, K., Matsushima, T., Takahashi, H., Sagiya, T., Ito, T., Miyazaki, S., Doke, R., Takeuchi, A., Miyao, K., Hirao, A., Maeda, T., Yamaguchi, T., Takada, M., Iwakuni, M., Ochi, T., Meilano, I., Hasegawa, A.

    Earth, Planets and Space　60　(11)　1081-1086　2008

    DOI： 10.1186/BF03353140 　

  141. Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced by a dense GPS network Peer-reviewed

    Yusaku Ohta, Mako Ohzono, Satoshi Miura, Takeshi Iinuma, Kenji Tachibana, Kota Takatsuka, Kayo Miyao, Toshiya Sato, Norihito Umino

    EARTH PLANETS AND SPACE　60　(12)　1197-1201　2008

    DOI： 10.1186/BF03352878 　

    ISSN： 1880-5981

  142. スマトラアンダマン地震の地震測地学的な側面からの知見

    伊藤 武男, 太田 雄策, Irwan Meilano, 木股 文昭

    The 3rd Investigation Report of 2004 Northern Sumatra Earthquakes, Graduate School of Environmental Studies, Nagoya University　2007

  143. Two Yeares GPS Observation in Aceh

    M. Irwan, Y. Ohta, F. Kimata, T. Ito, T. Tabei, D. Darmawan, H. Andreas, A. Hasannudin, K. Mipi, S. Sugiyanto, Agustan

    The 3rd Investigation Report of 2004 Northern Sumatra Earthquakes, Graduate School of Environmental Studies, Nagoya University　2007

  144. PPPキネマティックGPSの長期安定性評価 Invited Peer-reviewed

    太田雄策, 鷺谷威, 木股文昭

    測地学会誌　52　(4)　309-318　2006/12

    Publisher: The Geodetic Society of Japan

    DOI： 10.11366/sokuchi1954.52.309 　

    ISSN： 0038-0830

    More details Close

    We assessed long-term stability and repeatability of GEONET GPS site coordinates obtained by a kinematic positioning technique based on the Precise Point Positioning (PPP) strategy of the GIPSY/OASIS software version 4.0.4. The accuracy of the coordinates depended strongly on the quality of orbits and satellite clock information provided by data analysis centers. It was found that errors induced by the interpolations for products with low sampling rates caused large dispersion of the estimated coordinates. In order to assess coordinate precision, we compared three types of precise orbits and clock correction information (JPL 5-minutes, JPL 30-seconds and AIUB/CODE 30-seconds) of GPS satellites. Interpolation of JPL 5-minutes clock information to 30 seconds resulted in large dispersions of GPS site coordinate. In contrast, JPL 30-seconds and AIUB/CODE 30 seconds clock information gave much better results. During the long-term (more than 200 days) kinematic GPS analysis, anomalous deviations of estimated site coordinates occurred from time to time. A few specific GPS satellites whose orbiting periods deviate from sidereal days may have caused it. These results suggest that only a few GPS satellites with anomalous orbiting periods are responsible for large deviations of GPS site coordinates in kinematic positioning, which should be born in mind in applications of absolute kinematic GPS positioning.

  145. A large slow slip event and the depth of the seismogenic zone in the south central Alaska subduction zone Peer-reviewed

    Yusaku Ohta, Jeffrey T. Freymueller, Sigrun Hreinsdottir, Hisashi Suito

    EARTH AND PLANETARY SCIENCE LETTERS　247　(1-2)　108-116　2006/07

    DOI： 10.1016/j.epsl.2006.05.013 　

    ISSN： 0012-821X

  146. B16 Ground Vertical Deformation on Kozu Island Detected by Precise Leveling (-March 2006)(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)

    Kimata F., Miyajima R., Murase M., Ishikawa K., Ohta Y., Kato K., Michihana H.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2006　72-72　2006

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2006.0_72 　

  147. Crustal deformation following the 2004 Sumatra-Andaman earthquake in the northern Sumatra region (Preliminary report)

    Yusaku Ohta, Meilano Irwan, Takeo Ito, Fumiaki Kimata, Takao Tabei, Didik Sugiyanto

    2nd Investigation Report of 2004 Northern Sumatra Earthquake　109-113　2006

  148. Large surface wave of the 2004 Sumatra-Andaman earthquake captured by the very long baseline kinematic analysis of 1-Hz GPS data Peer-reviewed

    Y Ohta, Meilano, I, T Sagiya, F Kimata, K Hirahara

    EARTH PLANETS AND SPACE　58　(2)　153-157　2006

    DOI： 10.1186/BF03353372 　

    ISSN： 1880-5981

  149. B15 Estimation of Pressure Sources at Asama Volcano, Central Japan from Vertical Deformation Detected by Precise Leveling(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2005 FALL MEETING)

    Murase Masayuki, Ono Koji, Ohta Yusaku, Nishimae Kenicni, Kariya Shinichi, Miyajima Rikio, Kimata Fumiaki, Mori Hitoshi, Aoyama Hiroshi, Terada Akihiko, Koyama Eturo, Takeda Toyotaro, Osada Noboru, Watanabe Hidefumi

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2005　71-71　2005

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2005.0_71 　

  150. 2004年新潟県中越地震の震源域南部周辺における余効変動 Peer-reviewed

    鷺谷威, 大園真子, 西脇周平, 太田雄策, 佐々木雅子, 山室友生, 木股文昭

    地震　58　(3)　359-369　2005

    Publisher:

    DOI： 10.4294/zisin1948.58.3_359 　

    ISSN： 0037-1114

  151. Reexamination of the interplate coupling in the Tokai region, central Japan, based on the GPS data in 1997-2002 Peer-reviewed

    Y Ohta, F Kimata, T Sagiya

    GEOPHYSICAL RESEARCH LETTERS　31　(24)　2004/12

    DOI： 10.1029/2004GL021404 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  152. Ground uplift detected by precise leveling in the Ontake earthquake swarm area, central Japan in 2002-2004 Peer-reviewed

    F Kimata, R Miyajima, M Murase, D Darwaman, T Ito, Y Ohata, M Irwan, K Takano, F Ibrahim, E Koyama, H Tsuji, T Takayama, K Uchida, J Okada, D Solim, H Anderson

    EARTH PLANETS AND SPACE　56　(12)　E45-E48　2004

    DOI： 10.1186/BF03353324 　

    ISSN： 1343-8832

  153. Vertical Movements Detected by Precise Leveling at the Earthquake Swarm Area at Ontake Volcano in the Period of 1999-2003

    Kimata Fumiaki, Miyajima Rikio, Murase Masayuki, Meilano Irwan, Dudy Darmawan, Solim David, Ohta Yusaku, Fujii Naoyuki

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2003　33-33　2003

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2003.0_33 　

  154. 御嶽山群発地震域における精密水準測量による地殻上下変動(1999-2003年) －屋敷野地区における隆起の上下変動－

    木股文昭, 宮島力雄, 村瀬雅之, Meilano Irwan, Dudy Darmawan, David Solim, 太田雄策

    東濃地震科学研究所報告書　12　103-108　2003

  155. Present-day deformation across the southwest Japan arc: Oblique subduction of the Philippine Sea plate and lateral slip of the Nankai forearc Peer-reviewed

    T Tabei, M Hashimoto, S Miyazaki, Y Ohta

    EARTH PLANETS AND SPACE　55　(10)　643-647　2003

    DOI： 10.1186/BF03352471 　

    ISSN： 1343-8832

Show all ︎Show first 5

Misc. 77

  1. Relocated Earthquake Catalog near the Hypocenter of the 2024 Mw7.5 Noto Peninsula, Japan, Earthquake (from March 2003 to March 2024)

    Yoshida, Keisuke, Takagi, Ryota, Fukushima, Yo, Ando, Ryosuke, Ohta, Yusaku, Hiramatsu, Yoshihiro

    Zenodo　2024/07

    DOI： 10.5281/zenodo.12799165 　

  2. GNSS-Acoustic seafloor geodetic observations and their results along the Japan-Kuril trench

    富田史章, 木戸元之, 飯沼卓史, 太田雄策, 日野亮太, 大園真子, 高橋浩晃, PLATA-MARTINEZ Raymondo, 野徹雄, 中東和夫, 中村恭之

    日本地震学会秋季大会講演予稿集(CD-ROM)　2023　2023

  3. GNSS-Acoustic Observation Using the Wave Glider to Detect the Seafloor Crustal Deformation (3)

    飯沼卓史, 木戸元之, 福田達也, 太田雄策, 富田史章, 有吉慶介, 永野憲, PLATA-MARTINEZ Raymundo, 日野亮太, 高橋浩晃, 堀高峰

    日本測地学会講演会要旨　138th　2022

  4. Recent GNSS-Acoustic seafloor geodetic observations off Tohoku and their results

    富田史章, 木戸元之, 飯沼卓史, 太田雄策, 本荘千枝, 日野亮太, 野徹雄, 中東和夫

    日本地震学会秋季大会講演予稿集(CD-ROM)　2022　2022

  5. Development of a deep sea self-calibrated OBP with the A-0-A method for detection of long-term crustal deformation (fourth report)

    太田雄策, 日野亮太, 佐藤真樹子, 鈴木秀市, 大塚英人, 梶川宏明, 小畠時彦

    日本測地学会講演会要旨　136th　2021

  6. Development of a deep sea self-calibrated OBP with the A-0-A method for detection of long-term crustal deformation (Third report)

    太田雄策, 日野亮太, 佐藤真樹子, 鈴木秀市, 梶川宏明, 小畠時彦

    日本測地学会講演会要旨　134th　2020

  7. Preliminary assessment of quality of the S-net long-term ocean bottom pressure observation in the northern part of the Japan Trench for detecting crustal deformation

    久保田達矢, 近貞直孝, 日野亮太, 太田雄策, 大塚英人

    日本地球惑星科学連合大会予稿集(Web)　2020　2020

  8. 2015年蔵王山膨張イベントの変動源

    三浦哲, 山本希, 太田雄策, 市來雅啓, 出町知嗣

    東濃地震科学研究所報告　(44)　2020

  9. リアルタイム津波浸水被害予測の全国展開に向けた検討

    越村 俊一, 阿部 孝志, 井上 拓也, 撫佐 昭裕, 村嶋 陽一, 鈴木 崇之, 太田 雄策, 日野 亮太, 佐藤 佳彦, 加地 正明, 小林 広明

    SENAC : 東北大学大型計算機センター広報　52　(2)　2-8　2019/04

    Publisher: 東北大学サイバーサイエンスセンター

    ISSN： 0286-7419

  10. 非定常地殻変動の把握を目指したA-0-A方式による深海対応海底水圧計ドリフト補正システムの開発(第2報)

    太田雄策, 日野亮太, 佐藤真樹子, 鈴木秀市, 梶川宏明, 小畠時彦

    日本測地学会講演会要旨　132nd　2019

  11. S-netを用いた海域総合解析

    内田直希, 東龍介, 石上朗, 岡田知己, 高木涼太, 豊国源知, 海野徳仁, 太田雄策, 佐藤真樹子, 鈴木秀市, 高橋秀暢, 立岩和也, ZHAO Dapeng, 中山貴史, 長谷川昭, 日野亮太, 平原聡, 松澤暢, 吉田圭佑

    日本地球惑星科学連合大会予稿集(Web)　2019　2019

  12. 2015年蔵王山膨張イベントの変動源

    三浦哲, 山本希, 太田雄策, 出町知嗣, 立花憲司, 市來雅啓

    日本測地学会講演会要旨　132nd　2019

  13. 2015年蔵王山膨張イベントの変動源

    三浦哲, 山本希, 太田雄策, 出町知嗣, 立花憲司, 市來雅啓

    日本火山学会講演予稿集　2019　2019

    ISSN： 2433-5320

  14. Post‐seismic deformation of 2016 Kumamoto Earthquake by continuous GNSS network (3)

    NAKAO Shigeru, MATSUSHIMA Takeshi, TABEI Takao, OKUBO Makoto, YAMASHINA Tadashi, OHKURA Takahiro, NISHIMURA Takuya, NISHIMURA Takuya, SHIBUTANI Takuo, TERAISHI Masahiro, ITO Takeo, SAGIYA Takeshi, MATSUHIRO Kenjiro, KATO Teruyuki, FUKUDA Jun’ichi, WATANABE Atsushi, MIURA Satoshi, OHTA Yusaku, DEMACHI Tomotsugu, TAKAHASHI Hiroaki, OHZONO Mako, YAMAGUCHI Teruhiro, OKADA Kazumi

    日本地球惑星科学連合大会予稿集(Web)　2019　ROMBUNNO.SSS16‐P23 (WEB ONLY)　2019

  15. 2016年熊本地震後のGNSSによる地殻変動観測(3)

    中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見

    日本測地学会講演会要旨　130th　173‐174　2018/10/16

  16. OBSアレイで観測された日本海溝での誘発低周波微動

    大柳修慧, 太田和晃, 伊藤喜宏, 日野亮太, 太田雄策, 東龍介, 篠原雅尚, 望月公廣, 佐藤利典, 村井芳夫

    日本地震学会秋季大会講演予稿集(CD-ROM)　2018　ROMBUNNO.S22‐P06　2018/09/21

  17. 日本海溝の微動活動

    太田和晃, 伊藤喜宏, 片上智史, 大柳修慧, 日野亮太, 太田雄策, 東龍介, 篠原雅尚, 望月公廣, 佐藤利典, 村井芳夫

    日本地震学会秋季大会講演予稿集(CD-ROM)　2018　ROMBUNNO.S22‐14　2018/09/21

  18. Evaluation of the 2012 Indian Ocean Coseismic Fault Model in 3-D Heterogeneous Structure based on Vertical and Horizontal GNSS Observation Peer-reviewed

    Pratama, Cecep, Ito, Takeo, Tabei, Takao, Kimata, Fumiaki, Gunawan, Endra, Ohta, Yusaku, Yamashina, Tadashi, Nurdin, Irw, i, Sugiyanto, Didik, Muksin, Umar, Ismail, Nazli, Meilano, Irwan

    International Symposium on Earth Hazard and Disaster Mitigation (Isedm) 2017　1987　(1987)　020011　2018/07/19

    DOI： 10.1063/1.5047296 　

  19. 非定常地殻変動の把握を目指したA-0-A方式による深海対応海底水圧計ドリフト補正システムの開発(序報)

    太田雄策, 西間木佑衣, 日野亮太, 鈴木秀市, 佐藤真樹子, 梶川宏明, 小畠時彦

    日本測地学会講演会要旨　130th　2018

  20. スーパーコンピュータによるリアルタイム津波浸水被害予測

    越村 俊一, 阿部 孝志, 撫佐 昭裕, 村嶋 陽一, 鈴木 崇之, 井上 拓也, 太田 雄策, 日野 亮太, 佐藤 佳彦, 加地 正明, 小林 広明

    SENAC : 東北大学大型計算機センター広報　51　(1)　30-34　2018/01

    Publisher: 東北大学サイバーサイエンスセンター

    ISSN： 0286-7419

  21. Post‐seismic deformation of 2016 Kumamoto Earthquake by continuous GNSS network (2)

    NAKAO Shigeru, MATSUSHIMA Takeshi, TABEI Takao, OKUBO Makoto, YAMASHINA Tadashi, OHKURA Takahiro, NISHIMURA Takuya, SHIBUTANI Takuo, TERAISHI Masahiro, ITO Takeo, SAGIYA Takeshi, MATSUHIRO Kenjiro, KATO Teruyuki, FUKUDA Jun’ichi, WATANABE Atsushi, MIURA Satoshi, OHTA Yusaku, DEMACHI Tomotsugu, TAKAHASHI Hiroaki, OHZONO Mako, YAMAGUCHI Teruhiro, OKADA Kazumi

    日本地球惑星科学連合大会予稿集(Web)　2018　ROMBUNNO.SSS09‐P04 (WEB ONLY)　2018

  22. 2016年熊本地震後のGNSSによる余効変動の観測(2)

    中尾茂, 松島健, 田部井隆雄, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見

    日本地震学会秋季大会講演予稿集(CD-ROM)　2017　ROMBUNNO.S22‐14　2017/10/06

  23. 2016年熊本地震後のGNSSによる地殻変動観測

    中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見

    日本測地学会講演会要旨　128th　153‐154　2017/10/04

  24. 自己浮上式海底圧力計による海底上下変動長期観測にむけて

    日野亮太, 鈴木秀市, 佐藤真樹子, 太田雄策, 伊藤喜宏, 梶川宏明, 小畠時彦

    日本地球惑星科学連合大会予稿集(Web)　2017　2017

  25. 2016年熊本地震後のGNSSによる地殻変動観測

    中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見

    日本測地学会講演会要旨　126th　141‐142　2016/10/19

  26. 宮城県沖における海底地震計アレイ観測

    太田和晃, 伊藤喜宏, 日野亮太, 太田雄策, 東龍介, 篠原雅尚, 望月公廣, 佐藤利典, 村井芳夫

    日本地震学会秋季大会講演予稿集　2016　35　2016/09/16

  27. 2016年熊本地震後のGNSSによる余効変動の観測

    中尾茂, 松島健, 田部井隆雄, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見

    日本地震学会秋季大会講演予稿集　2016　23　2016/09/16

  28. リアルタイム津波浸水被害予測技術の実証

    越村俊一, 井上拓也, 日野亮太, 太田雄策, 小林広明, 撫佐昭裕, 村嶋陽一, 目黒公郎

    地域安全学会梗概集(CD-ROM)　(38)　ROMBUNNO.C‐15　2016/05

  29. RTK-GNSSを用いた震源断層即時推定手法の開発 : より正確な津波予測システムの構築に向けて

    太田 雄策

    測量 = The journal of survey : 地理空間情報の科学と技術　66　(3)　12-15　2016/03

    Publisher: 日本測量協会

    ISSN： 0285-7790

  30. 吾妻山の火山活動

    三浦哲, 山本希, 市來雅啓, 太田雄策, 出町知嗣, 立花憲司, 佐藤俊也

    東濃地震科学研究所報告　(36)　2016

  31. Seismic observations using ocean bottom seismometer arrays off-shore Miyagi, northeast Japan

    OHTA Kazuaki, ITO Yoshihiro, HINO Ryota, OHTA Yusaku, AZUMA Ryosuke, SHINOHARA Masanao, MOCHIZUKI Kimihiro, SATO Toshinori, MURAI Yoshio

    日本地球惑星科学連合大会予稿集(Web)　2016　ROMBUNNO.SSS02‐P04 (WEB ONLY)　2016

  32. 長期観測型海底地震計を用いた2011年東北沖地震震源域北部における地震観測

    篠原雅尚, 山田知朗, 望月公廣, 悪原岳, 仲谷幸浩, 塩原肇, 村井芳夫, 平塚晋也, 日野亮太, 太田雄策, 東龍介, 佐藤利典, 伊藤喜宏, 山下裕亮, 中東和夫, 寺岡拓也, 八木原寛

    日本地球惑星科学連合大会予稿集(Web)　2016　ROMBUNNO.SSS02‐22 (WEB ONLY)　2016

  33. GNSSによる2016年熊本地震発生後の地殻変動観測

    中尾茂, 松島健, 田部井隆雄, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見

    日本地球惑星科学連合大会予稿集(Web)　2016　ROMBUNNO.MIS34‐P31 (WEB ONLY)　2016

  34. 人工地震探査で推定した2011年東北沖地震大すべり域周辺の地殻構造

    東龍介, 日野亮太, 太田雄策, 望月公廣, 村井芳夫, 伊藤喜宏, 八木原寛, 佐藤利典, 篠原雅尚

    日本地震学会秋季大会講演予稿集　2015　129　2015/10/05

  35. アラスカ南東部で観測された絶対重力変化の再検討

    風間卓仁, 福田洋一, 佐藤忠弘, 太田雄策, 三浦哲

    日本地球惑星科学連合2015年大会, SGD21-01, 千葉県千葉市 (oral)　2015/05

  36. 蔵王山周辺の地殻変動(2) (地殻活動研究委員会報告書(平成26年度))

    三浦 哲, 太田 雄策, 出町 知嗣

    東濃地震科学研究所報告　(34)　39-44　2015/03

    Publisher: 地震予知総合研究振興会東濃地震科学研究所

  37. 蔵王山総合観測における地震観測網の展開

    平原聡, 三浦哲, 岡田知己, 中山貴史, 太田雄策, 立花憲司, 出町知嗣, 市來雅啓, 海田俊輝, 山本希, 西村太志, 大園真子

    東京大学地震研究所技術研究報告　(20)　2015

    ISSN： 1342-6486

  38. 吾妻山周辺の地殻変動

    三浦哲, 山本希, 市來雅啓, 西村太志, 太田雄策, 出町知嗣

    日本地球惑星科学連合大会予稿集(Web)　2015　2015

  39. B1-05 Postseismic strain anomaly along Volcanic Front after the 2011 Tohoku Earthquake

    Miura Satoshi, Ohta Yusaku, Iinuma Takeshi, Demachi Tomotsugu, Tachibana Kenji, Sato Toshiya, Ohzono Mako

    Programme and abstracts the Volcanological Society of Japan　2014　59-59　2014/11/02

    Publisher: Volcanological Society of Japan

  40. 東北地方太平洋沖地震から3年 発生前に起きていたスロースリップ

    内田直希, 伊藤喜宏, 加藤愛太郎, 太田雄策

    Seismological Soceiety of Japan NAIFURU　(97)　2-5　2014/04

  41. 蔵王山周辺の地殻変動 (地殻活動研究委員会報告書(平成25年度))

    三浦 哲, 太田 雄策, 出町 知嗣

    東濃地震科学研究所報告　(32)　39-45　2014/03

    Publisher: 地震予知総合研究振興会東濃地震科学研究所

  42. 特集：「世界の中の日本の測地学」

    太田雄策, 鷺谷威, 飯沼卓史

    測地学会誌　59　(3)　61-62　2014

  43. 霧島山の地殻変動から推定されるマグマ再蓄積

    中尾茂, 森田裕一, 後藤和彦, 八木原寛, 平野舟一郎, 及川純, 上田英樹, 高橋浩晃, 太田雄策, 松島健, 井口正人

    日本火山学会講演予稿集　2014　62　2014

  44. A2-18 Crustal deformation around Zao Volcano observed by GPS

    Miura Satoshi, Ohta Yusaku, Demachi Tomotsugu, Tachibana Kenji, Ohmi Katsuya, Shinohara Eiichiro

    Programme and abstracts the Volcanological Society of Japan　2013　37-37　2013/09/29

    Publisher: Volcanological Society of Japan

  45. Source process of explosive eruptions inferred from a seismic array close to the active crater of Suwanosejima volcano, Japan

    Nakamichi, H, Aoyama, H, Nishimura, T, Yakiwara, H, Ohta, Y, Yokoo, A, Iguchi, M

    AGU Fall meeting 2012　2012/12

  46. 絶対重力計FG5および超伝導重力計iGravを用いたアラスカ南東部における重力観測

    風間卓仁, 佐藤忠弘, 太田雄策, 三浦哲, M. Kaufman, S. Herreid, J. Freymueller

    日本測地学会第118回講演会, 21, 仙台 (oral)　2012/10/31

  47. A2-10 Ground Deformation at Sakurajima Volcano and around Aira Caldera since 2009

    Iguchi Masato, Ohta Yusaku, Nakao Shigeru, Sonoda Tadaomi, Takayama Tetsuro, Ichikawa Nobuo

    Programme and abstracts the Volcanological Society of Japan　2012　30-30　2012/10/14

    Publisher: Volcanological Society of Japan

  48. 塩野原基線の再測量

    鷺谷威, 鷺谷威, 太田雄策, 松多信尚, MENESES Angela, 野村晋一, 鈴木翔太

    日本測地学会講演会要旨　118th　2012

  49. B1-15 What happens in the Initial Phase of Magma Accumulation Process prior to Sub-Plinian Eruptions at Kirishima Volcano on Jan. 2011

    Nakao S., Morita Y., Goto K., Yakiwara H., Hirano S., Oikawa J., Ueda H., Kozono T., Hirata Y., Takahashi H., Ichiyanagi M., Ohta Y., Matsushima T., Iguchi M.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2012　61-61　2012

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2012.0_61 　

  50. Volcano inflations prior to small vulcanian eruptions at Suwanose-jima volcano, Japan

    Nishimura, T, Iguchi, M, Oikawa, J, Yakiwara, H, Aoyama, H, Ohta, Y, Nakamichi, H, Tameguri, T

    AGU Fall meeting 2011　2011/12

  51. 桜島火山山腹におけるGPS連続観測および予備的な解析結果(2010年度)

    太田雄策, 植木貞人, 出町知嗣, 井口正人

    桜島火山における多項目観測に基づく火山噴火準備過程解明のための研究2010年報告書　43-47　2011

  52. B3-09 Array Analysis of Explosion Earthquakes and Tremor observed at Suwanosejima Volcano, southwest Japan

    Nakamichi H., Aoyama H., Nishimura T., Yakiwara H., Ohta Y., Yokoo A., Iguchi M.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN　2011　(0)　106-106　2011

    Publisher: The Volcanological Society of Japan

    DOI： 10.18940/vsj.2011.0_106 　

    ISSN： 2433-5320

  53. 霧島新燃岳2011年1月26日噴火前後の地殻変動

    中尾茂, 森田裕一, 後藤和彦, 八木原寛, 平野舟一郎, 及川純, 上田英樹, 小園誠史, 平田安廣, 高橋浩晃, 一柳昌義, 太田雄策, 松島健, 井口正人

    日本火山学会講演予稿集　2011　27　2011

  54. 津波計としての地殻変動連続観測 (地殻活動研究委員会報告書(平成21年度))

    三浦 哲, 高塚 晃多, 太田 雄策

    東濃地震科学研究所報告　(25)　155-167　2010/03

    Publisher: 地震予知総合研究振興会東濃地震科学研究所

  55. 桜島昭和火口噴火開始以降のGPS観測

    井口正人, 植木貞人, 太田雄策, 中尾茂, 園田忠臣, 高山鐵朗, 市川信夫

    桜島火山における多項目観測に基づく火山噴火準備過程解明のための研究2009年報告書　47-53　2010

  56. 「地震学夏の学校2009」総合報告

    矢部康男, 伊藤喜宏, 内田直希, 太田雄策, 中島淳一, 中原恒, 山本希

    日本地震学会ニュースレター　21　(4)　4-5　2009/11/10

    ISSN： 0919-5319

  57. Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced by a dense GPS network

    OHTA Yusaku, OHZONO Mako, MIURA Satoshi, IINUMA Takeshi, TACHIBANA Kenji, TAKATSUKA Kota, MIYAO Kayo, SATO Toshiya, UMINO Norihito

    EPS　60　(12)　1197-1201　2008/12/01

    Publisher: Terra Scientific Pub. Co.

    ISSN： 1343-8832

  58. 2008年岩手・宮城内陸地震(M7.2)に伴った地震時・地震後地殻変動

    三浦哲, 太田雄策, 大園真子, 飯沼卓史, 立花憲司, 植木貞人, 高塚晃多, 宮尾佳世, 佐藤俊也, 対馬弘晃高橋浩晃, 山口照寛, 笠原稔, 鷺谷威, 小澤和浩, 福田真人, 朝日友香, 松島健, 中元真美, 山下裕亮, 中尾茂

    2008　(20)　10-14　2008/11

  59. 稠密GPS観測網による2008年岩手・宮城内陸地震の余効変動の時空間変化推定

    飯沼卓史, 大園真子, 太田雄策, 三浦哲, 植木貞人, 高塚晃多, 対馬弘晃, 立花憲司, 松島健, 中元真美, 山下裕亮, 鷺谷威, 小澤和浩, 福田真人, 朝日友香, 笠原稔, 高橋浩晃, 山口照寛, 中尾茂

    日本測地学会講演会要旨　110th　149-150　2008/10

  60. 桜島および姶良カルデラ周辺におけるGPS観測

    井口正人, 高山鉄朗, 山崎友也, 多田光宏, 鈴木敦生, 植木貞人, 太田雄策, 中尾茂, 前野直, 長尾潤, 馬場幸二, 大重吉輝, 放生会正美

    第10回桜島火山の集中総合観測（平成19年6月～平成20年3月）　53-61　2008

  61. 稠密GPS観測に基づく2007年中越沖地震の余効変動

    太田雄策, 三浦哲, 立花憲司, 飯沼卓史, 松島健, 高橋浩晃, 宮崎真一, 鷺谷威, 伊藤武男, 道家涼介, 竹内章, 宮尾佳世, 平尾暁彦, 前田宜浩, 山口照寛, 高田真秀, 岩國真紀子, 落唯史, MEILANO Irwan

    日本地震学会秋季大会講演予稿集　2007　182　2007/10/01

  62. 稠密GPS観測網による2007年中越沖地震の余効変動観測 その2 余効変動の時空間変化推定

    飯沼卓史, 太田雄策, 三浦哲, 立花憲司, 長谷川昭, 宮尾佳世, 松島健, 平尾暁彦, 高橋浩晃, 前田宜浩, 山口照寛, 高田真秀, 宮崎真一, 岩國真紀子, 落唯史, 鷺谷威, 伊藤武男, MEILANO Irwan, 道家涼介, 竹内章

    日本測地学会講演会要旨　108th　49-50　2007/10

  63. 稠密GPS観測網による2007年中越沖地震の余効変動観測 その1―GPS臨時観測の概要―

    太田雄策, 三浦哲, 立花憲司, 飯沼卓史, 松島健, 高橋浩晃, 宮崎真一, 鷺谷威, 伊藤武男, 道家涼介, 竹内章, 宮尾佳世, 平尾暁彦, 前田宜浩, 山口照寛, 高田真秀, 岩國真紀子, 落唯史, MEILANO Irwan

    日本測地学会講演会要旨　108th　47-48　2007/10

  64. インドネシア国スマトラにおけるGPS 観測のための予備調査 -スマトラのGPS観測による2004年アチェ・アンダマン地震の滑り分布の推定-

    木股文昭, 伊藤武男, 太田雄策, Meilano IRWAN, 田部井隆雄

    防災科学技術研究所研究資料　(304)　57-68　2007/03

  65. 2006年5月27日中部ジャワ地震に対する名古屋大学環境学研究科による地震学・社会学の緊急国際共同調査

    木股文昭, 安藤雅隆, 奥田隆, IRWAN M, 太田雄策, 中道治久, 田所敬一, 田中重好, 田渕六郎, 高橋誠, 木村玲欧, 林良嗣

    日本地震学会秋季大会講演予稿集　2006　53　2006/10/01

  66. 愛知県における深部底周波微動のアレイ観測

    中道治久, 渡辺俊樹, 中村祥, 相馬知征, 柏木雅生, 山脇輝夫, 太田雄策, 山田守, 山田功夫, 鷺谷威, 山崎文人, 田所敬一, 伊藤武男, 仮屋新一, 村瀬雅之, 利根川貴志, 大園真子, 大石陽, 山室友生, 石川渓太, 大石真紀子, 安田仁, 猪飼憲一, 岡本和之, 小澤和浩, 武藤大介, CAKA D

    日本地震学会秋季大会講演予稿集　2006　163　2006/10/01

  67. Large surface wave of the 2004 Sumatra-Andaman earthquake captured by the very long baseline kinematic analysis of 1-Hz GPS data

    OHTA Yusaku, MEILANO Irwan, SAGIYA Takeshi, KIMATA Fumiaki, HIRAHARA Kazuro

    EPS　58　(2)　153-157　2006/02/01

    Publisher: Terra Scientific Pub. Co.

    ISSN： 1343-8832

  68. スマトラのＧＰＳ観測から見えてきた滑り分布：スマトラアチェでのＧＰＳ観測から見えてきた2004年アチェ・アンダマン地震の滑り分布

    木股文昭, 伊藤武男, 太田雄策, メイラノイルワン, 田部井隆雄

    月刊地球、スマトラ地震特集号　86-94　2006

  69. スマトラの GPS 観測による2004年アチェ・アンダマン地震の滑り分布の推定

    木股文昭, 伊藤武男, 太田雄策, メイラノイルワン, 田部井隆雄

    月刊 地球/号外，56，スマトラ島沖地震とインド洋津波/2004　(56)　86-94　2006

    Publisher: 海洋出版

    ISSN： 0916-9733

  70. GPSデータに基づくスマトラ沖地震による余効変動

    太田雄策, Meilano Irwan, 伊藤武男, 木股文昭, Didik Sugiyanto

    日本地震学会ニュースレター,　17　(2)　21-22　2005/06/10

  71. GPSデータに基づくスマトラ沖地震の余効変動

    太田 雄策, Meilano Irwan, 伊藤 武男, 木股 文昭, 田部井 隆雄, Didik Sugiyant

    地震学会ニュースレター　7　(2)　21-22-22　2005

    ISSN： 0919-5319

  72. スマトラ沖地震のGPS観測

    伊藤 武男, 木股 文昭, イルワン メイラノ, 太田 雄策, 田部井 隆雄

    地震学会ニュースレター　5　15-17　2005

  73. 浅間火山における2004年水準測量の結果と(1935-1939-1953年に観測された)上下変動にもとづく圧力源の推定

    小野幸治, 村瀬雅之, 木股文昭, 宮島力雄, 太田雄策, 仮屋新一, 西前健一, 柏木雅生, 森 済, 青山 裕, 寺田暁彦, 小山悦郎, 竹田豊太郎, 長田 昇, 渡辺秀文

    2004年浅間火山の噴火に関する総合的調査，科学研究費補助金(特別研究促進費)研究成果報告書C-18（課題番号16800002）　37-39　2005

  74. 御嶽山群発地震域において精密水準測量から検出された地盤の隆起変動 2002年4月-2004年4月

    木股文昭, 村瀬雅之宮, 島力雄, Dudy Darmawan, 伊藤武男, 高野和友, 太田雄策, Irwan Meirano, Herri Anderson, David Solim, Fauzan Ibrahim, 小山悦郎, 辻 浩, 高山鐵郎, 内田和也, 岡田 純

    東濃地震科学研究所報告書　14　7-18　2004/05

  75. GPS観測による上下変動から考察する2001年東海スロースリップ

    太田雄策, 木股文昭

    東濃地震科学研究所報告　(12)　70-77　2003

  76. EGS-AGU-EUG Joint Assembly & ルクセンブルグWorkshop報告

    太田雄策

    測地学会誌　49　(3)　193-194　2003

  77. 御嶽山群発地震域における精密水準測量による地殻上下変動 1999-2002年

    木股文昭, 宮島力雄, 村瀬雅之, Meilano Irwan, 太田雄策

    東濃地震科学研究所報告　(10)　69-75　2002

Show all ︎Show first 5

Books and Other Publications 2

  1. 図説地球科学の事典

    鳥海光弘, 他編

    朝倉書店　2018/04

    ISBN: 9784254160727

  2. 東日本大震災を分析する １．地震・津波のメカニズムと被害の実態

    藤本博己, 木戸元之, 飯沼卓史, 長田幸仁, 日野亮太, 伊藤喜宏, 太田雄策

    明石書店　2013/06/12

    ISBN: 9784750338231

Presentations 490

  1. Postseismic deformation of the 2024 M7.6 Noto Peninsula earthquake observed by dense GNSS networks

    Takuya NISHIMURA, Yoshihiro Hiramatsu, Yusaku Ohta

    JpGU 2025　2025/05/26

  2. Preliminary analysis of common-mode errors at GNSS stations operated by SoftBank

    Yutaro Okada, Yusaku Ohta, Miku Ohtate, Yo Fukushima

    JpGU 2025　2025/05/26

  3. Proposal for a Correction Method for Displacement Steps Caused by Maintenance in SoftBank Original reference Sites Time Series

    Miku Ohtate, Yusaku Ohta

    JpGU 2025　2025/05/26

  4. Optimization of a GNSS multipath noise reduction method based on MHM methods

    Yoshiaki Ito, Yusaku Ohta

    JpGU 2025　2025/05/26

  5. Utilizing Dense Tropospheric Delay Products from GNSS in InSAR Noise Correction

    Sardila Nurulhikmah Sailellah, Yo Fukushima, Yusaku Ohta

    JpGU 2025　2025/05/26

  6. Estimation of a coseismic slip distribution model considering self-similarity of the 2024 Noto Peninsula earthquake using very dense geodetic observation

    Taisuke Yamada, Yusaku Ohta, Takuya NISHIMURA, Yoshihiro Hiramatsu, Yohei Kinoshita, Keisuke Yoshida, Yoshiaki Ito, Miku Ohtate

    JpGU 2025　2025/05/26

  7. Operation and current achievement of a “Consortium to utilize the SoftBank original reference sites for Earth and Space Science”

    Yusaku Ohta

    JpGU 2025　2025/05/26

  8. Crustal Strain Rate Distribution Derived from an Ultra-Dense GNSS Observation Network in Japan

    Miku Ohtate, Yusaku Ohta, Mako Ohzono, Hiroaki Takahashi

    JpGU 2025　2025/05/29

  9. Assessment of long-term drift removal performance using the A-0-A approach based on the laboratory experiment

    Takumi Hagihara, Yusaku Ohta, Ryota Hino, Makiko Sato, Syuichi Suzuki, Hiroaki Kajikawa

    JpGU 2025　2025/05/28

  10. Quantitative evaluation of accuracy and precision for the RBR pressure sensor based on the laboratory experiment

    Shuichi Suzuki, Makiko Satp, Yusaku Ohta, Hiroaki Kajikawa, Tomomi Onodera, Takayuki Abe, Kazuma Saito, Noboru Fujii, Naoki Takahashi, Ryota Hino

    JpGU 2025　2025/05/28

  11. Evaluation of vertical oceanic processes affecting seafloor pressure using MRI.COM and DONET observations

    Hideto Otsuka, Yusaku Ohta, Shuya Wang, Norihisa Usui, Ryota Hino

    JpGU 2025　2025/05/28

  12. Is the small shortening of the baseline length detected by Acoustic Distance Meter significant?

    Shoutarou Matsumoto, Motoyuki Kido, Ryota Hino, Yusaku Ohta

    JpGU 2025　2025/05/28

  13. Initiation of GNSS-Acoustic seafloor geodetic observation along the Japan trench off Boso

    Fumiaki Tomita, Motoyuki Kido, Kazuo Nakahigashi, Yusaku Ohta, Kanata Endo, Chi-Hsien Tang, Ryota Hino

    JpGU 2025　2025/05/28

  14. Seafloor Crustal Deformation Observations Utilizing Unmanned Surface Vehicles at Plate Subduction zones around the Japanese Islands

    Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Tatsuya Fukuda, Fumiaki Tomita, Yusuke Yokota, Ryota Hino, Mikiko Fujita, Takane Hori

    JpGU 2025　2025/05/28

  15. Spatiotemporal Evolution of Aseismic Slip Preceding the 2011 Tohoku-Oki Earthquake by Reprocessed OBPR Data

    Hirata Kyosuke, Ryota Hino, Taisuke Yamada, Kosuke Minamoto, Hideto Otsuka, Yusaku Ohta, Tatsuya Kubota

    JpGU 2025　2025/05/27

  16. Postseismic deformation of the 2011 Tohoku earthquake: Insights from GNSS, GNSS-A, and repeating earthquake observations Invited

    Fumiaki Tomita, Tianhaozhe Sun, Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Naoki Uchida, Kelin Wang

    JpGU 2025　2025/05/26

  17. Estimation of crustal deformation of Miyakejima volcano and its pressure sources by using GNSS data

    Rin Matsubara, Takeshi Matsushima, Ayuka Joudoi, Atsushi Watanabe, Jun Oikawa, Yosuke Aoki, Yusaku Ohta

    JpGU 2025　2025/05/26

  18. Source estimation of the 2024 Iwate Volcano unrest based on dense GNSS observation networks and strainmeter observations

    Yusaku Ohta, Miku Ohtate, Mare Yamamoto, Keitaro Ohno, Tomotsugu Demachi, Satoshi Miura

    JpGU 2025　2025/05/26

  19. Spatio-temporal variation in seismic activity around the source areas of the 2021 and 2022 M7 intraslab earthquakes off Fukushima Prefecture

    Ryo Osawa, Ryota Hino, Keisuke Yoshida, Miku Ohtate, Yusaku Ohta

    JpGU 2025　2025/05/29

  20. Observed abyssal temperature variability modulated by mesoscale eddies

    Shuya Wang, Yusaku Ohta, Motoyuki Kido, Fumiaki Tomita, Ryota Hino

    JpGU 2025　2025/05/27

  21. 計画推進部会報告：災害誘因評価・即時予測 部会サマリー

    太田雄策

    令和６年度「災害の軽減に貢献するための地震火山観測研究計画（第３次）」成果報告シンポジウム　2025/03/05

  22. A Thin and Weak Oceanic Lithosphere-Asthenosphere Boundary (LAB) Inferred From Crustal Deformation Following the 2011 Mw=9 Tohoku Earthquake

    Tianhaozhe Sun, Fumiaki Tomita, Takeshi Iinuma, Ryota Hino, Motoyuki Kido, Yusaku Ohta, Jiangheng He, Kelin Wang

    AGU Fall Meeting 2024　2024/12/13

  23. Viscoelastic Relaxation and Afterslip Contribution to Postseismic Crustal Deformation After the 2024 Noto Peninsula Earthquake: Verification Using Very Dense GNSS Observations

    Miku Ootate, Yusaku Ohta, Yuta Mitsui

    AGU Fall Meeting 2024　2024/12/12

  24. Coseismic Slip Distribution and Fault Geometry Evaluation of the 2024 Noto Peninsula Earthquake Deduced from Very Dense GNSS Networks

    Taisuke Yamada, Yusaku Ohta, Takuya Nishimura, Yoshihiro Hiramatsu, Yohei Kinoshita, Keisuke Yoshida

    AGU Fall Meeting 2024　2024/12/12

  25. A mysterious shallow slow slip event beneath the southern Ryukyu forearc

    Chi-Hsien Tang, Ya-Ju Hsu, Yutaro Okada, Yusaku Ohta, Takeshi Sagiya, Yoshiaki Tamura, Takaaki Jike

    AGU Fall Meeting 2024　2024/12/12

  26. The Spatiotemporal Evolution of Aseismic Slips Before the 2011 Tohoku Earthquake Based on the Reprocessed OBPR Data

    Kyosuke Hirata, Ryota Hino, Taisuke Yamada, Kosuke Minamoto, Hideto Otsuka, Yusaku Ohta, Tatsuya Kubota

    AGU Fall Meeting 2024　2024/12/11

  27. Precise aftershock activity by rapid response seafloor observation in the eastern source region of the 2024 Noto-Hanto earthquake using ocean bottom seismometers

    Masanao Shinohara, Ryota Hino, Tsutomu Takahashi, Koichiro Obana, Shuichi Kodaira, Ryosuke Azuma, Tomoaki Yamada, Takeshi Akuhara, Yusuke Yamashita, Eiji Kurashimo, Yoshio Murai, Takehi Isse, Kazuo Nakahigashi, Hisatoshi Baba, Yusaku Ohta, Yoshihiro Ito, Hiroshi Yakiwara, Yukihiro Nakatani, Gou Fujie, Toshinori Sato, Hajime Shiobara, Kimihiro Mochizuki, Shin'ichi Sakai, KH, nd KH, C shipboard Scientists

    AGU Fall Meeting 2024　2024/12/13

  28. Tsunami Digital Twin : Its Concept, Progress, and Applications to Japan and the US Invited

    Shunichi Koshimura, Yuichiro Tanioka, Diego Melgar, Brendan Crowell, Ronald T Eguchi, Yusaku Ohta, Erick Mas, Bruno Adriano, Ayumu Mizutani, Akihiro Musa, Yoshihiko Sato, Hiroyuki Takizawa, Hiroaki Kobayashi

    AGU Fall Meeting 2024　2024/12/09

  29. Postseismic deformation following the 2011 Tohoku earthquake revealed by onshore geodetic, offshore geodetic, and small repeating earthquake observations

    Fumiaki Tomita, Tianhaozhe Sun, Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Naoki Uchida, Ryota Hino, Kelin Wang

    AGU Fall Meeting 2024　2024/12/10

  30. Interseismic Strain Rates and Uplift Rates in Central Japan Derived from L-band InSAR and Dense GNSS Networks

    Shogo Nagaoka, Youichiro Takada, Takuya Nishimura, Takeshi Sagiya, Yusaku Ohta

    AGU Fall Meeting 2024　2024/12/10

  31. Development of a Mobile OBP Observation System with a Self-calibration Function of Long-term Sensor Drift

    Yusaku Ohta, Ryota Hino, Makiko Sato, Syuichi Suzuki, Hiroaki Kajikawa, Shuhei Nishida, Hiroyuki Matsumoto, Yuya Machida, Eiichiro Araki

    AGU Fall Meeting 2024　2024/12/10

  32. Simultaneous estimation of coseismic slips on the plate boundary and the branching splay fault in the Nankai subduction zone

    Taisuke Yamada, Yusaku Ohta

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  33. Preliminary results on the crustal strain distribution in Tohoku region using CSESS's dense GNSS observation network

    Miku Ohtate, Yusaku Ohta, Mako Ohzono

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  34. Development of knowledge base for continuous GNSS and crustal deformation observation at Tohoku University

    Tomotsugu Demachi, Toshiki Kaida, Syuichi Suzuki, Makiko Sato, Yusaku Ohta, Satoshi Miura

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  35. Assessment of crustal deformation in the area around the trench axis of the Kuril Trench off Nemuro using direct acoustic ranging.

    Shotaro Matsumoto, Motoyuki Kido, Ryota Hino, YUsaku Ohta

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  36. Development of a multipath noise reduction method using direct carrier phase correction

    Yoshiaki Ito, Yusaku Ohta

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  37. Viscoelastic relaxation and afterslip contribution to the postseismic crustal deformation after the 2024 Noto Peninsula earthquake -Verification using very dense GNSS observations-

    Miku Ohtate, Yusaku Ohta, Yuta Mitsui

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  38. Slip deficit inferred from GNSS-Acousitc observations off Nemuro

    Fumiaki Tomita, Yusaku Ohta, Motoyuki Kido, Mako Ohzono, Hiroaki Takahashi, Ryota Hino, Takeshi Iinuma

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  39. Toward high-resolution interseisimic strain rate mapping using InSAR and Ultra-dense GNSS network: Application to the Chubu region, Japan

    Shogo Nagaoka, Youichiro Takada, Takuya Nishimura, Takeshi Sagiya, Yusaku Ohta

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  40. Strain Localization in Hida Mountains due to the 2024 Noto Peninsula Earthquake: Application of very dense GNSS network

    Shogo Nagaoka, Youichiro Takada, Takuya Nishimura, Takeshi Sagiya, Yusaku Ohta

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  41. Overview of nationwide crustal strain distribution using CSESS's GNSS observation network

    Mako Ohzono, Yusaku Ohta, Miku Ohtate, Hiroaki Takahashi

    142nd Meeting of the Geodetic Society of Japan　2024/10/31

  42. Quantitative Evaluation of coseismic slip distribution and fault geometry of the 2024 Noto Peninsula earthquake based on dense geodetic data

    Taisuke Yamada, Yusaku Ohta, Takuya Nishimura, Yoshihiro Hiramatsu, Yohei Kinoshita, Keisuke Yoshida

    142nd Meeting of the Geodetic Society of Japan　2024/10/30

  43. Crustal deformation after the 2024 M7.6 Noto Peninsula earthquake based on the combined GNSS analysis

    Takuya NISHIMURA, Yoshihiro HIRAMATSU, Yusaku OHTA

    SSJ Fall Meeting 2024　2024/10/23

  44. Viscoelastic relaxation and afterslip contribution to the postseismic crustal deformation after the 2024 Noto Peninsula earthquake

    Miku Ohtate, Yusaku Ohta, Yuta Mitsui

    SSJ Fall Meeting 2024　2024/10/23

  45. Utilization of Unmanned Surface Vehicles in GNSS-Acoustic Observation Using to Detect the Seafloor Crustal Deformation

    Takeshi IINUMA, Motoyuki Kido, Tatsuya Fukuda, Yusaku Ohta, Fumiaki Tomita, Ryota Hino, Hiroaki Takahashi, Takane Hori, Yusuke Yoko

    SSJ Fall Meeting 2024　2024/10/22

  46. The Spatiotemporal Evolution of Afterslip Following the Largest Foreshock (M 7.3) of the 2011 Tohoku Earthquake Based on OBPR Data

    Kyosuke Hirata, Ryota Hino, Taisuke Yamada, Kosuke Minamoto, Hideto Otsuka, Yusaku Ohta, Tatsuya Kubota

    SSJ Fall Meeting 2024　2024/10/22

  47. Establishment of a “Consortium to utilize the SoftBank original reference sites for Earth and Space Science” and current achievements

    Yusaku Ohta

    SSJ Fall Meeting 2024　2024/10/22

  48. Spatio-temporal characteristics in GNSS time series based on robust spectral analysis

    Keisuke YANO, Masayuki Kano, Tetsuya Takatabatake, Yusuke Tanaka, Yusaku Ohta

    SSJ Fall Meeting 2024　2024/10/22

  49. Comprehensive evaluation of slip distribution and fault geometry of the 2024 Noto Peninsula earthquake based on dense GNSS networks

    Taisuke Yamada, Yusaku Ohta, Takuya NISHIMURA, Yoshihiro Hiramatsu, Yohei Kinoshita, Keisuke Yoshida

    SSJ Fall Meeting 2024　2024/10/22

  50. Precise aftershock activity by rapid response seafloor seismic observation in the eastern source region of the 2024 Noto-Hanto earthquake

    Masanao Shinohara, Ryota Hino, Tsutomu Takahashi, Koichiro Obana, Shuichi Kodaira, Ryosuke Azuma, Tomoaki Yamada, Takkeshi Akuhara, Yusuke Yamashita, Eiji Kurashimo, Yoshio Murai, Takehi Isse, Kazuo Nakahigashi, Hisatoshi Baba, Yusaku Ohta, Yoshihiro Ito, Hiroshi Yakiwara, Yukihiro Nakatani, Gou Fujie, Toshinori Sato, Hajime Shiobara, Kimihiro Mochizuki, Shin'ichi Sakai, KH, KH, C shipboard scientis

    SSJ Fall Meeting 2024　2024/10/20

  51. Rapid estimation of co-seismic crustal deformation and fault models for the 2024 Hyuganada Sea earthquake by REGARD

    Mayumi Hashimoto, Takayuki Miyazaki, Keitaro Ohno, Shinsuke Murakami, Naofumi Takamatsu, Takahiro Wakasugi, Yusaku Ohta

    SSJ Fall Meeting 2024　2024/10/21

  52. Postseismic deformation after the 2011 Tohoku earthquake captured by GNSS, GNSS-A, and small repeating earthquakes

    Fumiaki TOMITA, Tianhaozhe Sun, Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Naoku Uchida, Ryota Hino, Kelin Wang

    SSJ Fall Meeting 2024　2024/10/21

  53. 有珠山 2000 年噴火時の GPS データの再解析によ る地盤変動観測

    平戸悠登, 田中 良, 大園真子, 太田雄策, 大野圭太郎

    日本火山学会2024年度秋季大会　2024/10/16

  54. 超稠密 GNSS 観測網による屈斜路カルデラ周辺の 非定常地殻変動

    大園真子, 高橋浩晃, 奥山 哲, 太田雄策, 大野圭太郎

    日本火山学会2024年度秋季大会　2024/10/16

  55. The amount of delay as a factor in the degradation of precision in crustal deformation observations of one day or less.

    Yusaku Ohta

    'Science of Tropospheric Water Vapour' interdisciplinary research workshop.　2024/06/06

  56. Earthquake activity in the Noto Peninsula during 2020-2024 deduced from geodetic observations

    Takuya NISHIMURA, Yoshihiro Hiramatsu, Yusaku Ohta

    JpGU 2024　2024/05/25

  57. Precise aftershock distribution by urgent seafloor observation in;he eastern source region of th;Noto-Hanto earthquake using ocean;ottom seism

    Masanao Shinohara, Yoshio Murai, Ryota Hino, Yusaku Ohta, Ryosuke Azuma, Toshinori Sato, Hajime Shiobara, Kimihiro Mochizuki, Takehi Isse, Tomoaki Yamada, Takeshi Akuhara, Shinichi Sakai, Eiji Kurashimo, Kazuo Nakahigashi, Hisatoshi Baba, Yoshihiro Ito, Yusuke Yamashita, Hiroshi Yakiwara, Yukihiro Nakatani, Shuichi Kodaira, Koichiro Obana, Gou Fujie, Tsutomu Takahash, KH, nd KH, C shipboard scientists

    JpGU 2024　2024/05/28

  58. The 2024 Noto Peninsula Earthquake Tsunami Recorded by Strainmeters

    Satoshi Miura, Tomotsugu Demachi, Yusaku Ohta

    JpGU 2024　2024/05/28

  59. Effects of possible three-dimensional heterogeneity on future postseismic deformation of the 2024 Noto Peninsula Earthquake

    Miku Ohtate, Yusaku Ohta, Yuta Mitsui

    JpGU 2024　2024/05/28

  60. Relationship between the coseismic slip distribution and its assumed fault geometry in the 2024 Noto Peninsula earthquake derived from very dense geodetic observation data

    Taisuke Yamada, Yusaku Ohta, Takuya NISHIMURA, Yoshihiro Hiramatsu, Yohei Kinoshita, Keisuke Yoshida

    JpGU 2024　2024/05/28

  61. Rapid estimation of coseismic crustal deformation and fault model associated with the 2024 Noto Peninsula earthquake using REGARD

    Naofumi Takamatsu, Takayuki Miyazaki, Keitaro Ohno, Shinsuke Murakami, Takahiro Wakasugi, Yusaku Ohta

    JpGU 2024　2024/05/28

  62. Quick response survey cruises for the 2024 Noto Peninsula Earthquake by R/V Hakuho-maru (KH-24-JE01 and KH-24-JE02C)

    Koichiro Obana, Tsutomu Takahashi, Yoshio Murai, Ryota Hino, Yusaku Ohta, Ryosuke Azuma, Toshinori Sato, Masanao Shinohara, Hajime Shiobara, Takehi Isse, Tomoaki Yamada, Takeshi Akuhara, Kazuo Nakahigashi, Hisatoshi Baba, Yoshihiro Ito, Yusuke Yamashita, Tada-nori Goto, Hiroshi Yakiwara, Yukihiro Nakatani, Takafumi Kasaya, Yusuke Ohta, Junji Kaneko, Satoshi Ogura, Tetsuo No, Gou Fujie, Shuichi Kodaira, KH-24-JE01 and KH-24-JE02C cruise participants

    JpGU 2024　2024/05/28

  63. Generation Process of the 2024 Mw7.5 Noto Peninsula earthquake Inferred from Microearthquake Migration that Continued for a Few Years on the Fault

    Keisuke Yoshida, Ryota Takagi, Yo Fukushima, Ryosuke Ando, Yusaku Ohta, Naoki Uchida, Satoshi Hirahara, Shuutoku Kimura, Tomomi Okada, Ryota Hino, Shinichi Sakai, Yoshihiro Hiramatsu, Satoshi Matsumoto

    JpGU 2024　2024/05/28

  64. Evaluation of favorable to slip of the fault – in the case of the 2024 Noto Peninsula Earthquake

    Ayaka Tagami, Tomomi Okada, Martha K Savage, Toru Matsuzawa, Ryotaro Fujimura, Kazuya Tateiwa, Keisuke Yoshida, Shuutoku Kimura, Satoshi Hirahara, Ryota Takagi, Taisuke Yamada, Yusaku Ohta

    JpGU 2024　2024/05/28

  65. Source models for the 2020-2024 Noto Peninsula earthquakes based on GNSS data Invited

    Takuya NISHIMURA, Yoshihiro Hiramatsu, Yusaku Ohta

    JpGU 2024　2024/05/28

  66. Noise characteristics in GNSS time series based on robust spectral analysis: (2) application to GEONET F5 solution

    Masayuki Kano, Keisuke Yano, Yusuke Tanaka, Tetsuya Takabatake, Yusaku Ohta

    JpGU 2024　2024/05/29

  67. Noise characteristics in GNSS time series based on robust spectral analysis: (1) Description of robust spectral estimation

    Keisuke Yano, Masayuki Kano, Tetsuya Takabatake, Yusuke Tanaka, Yusaku Ohta

    JpGU 2024　2024/05/29

  68. Transient crustal deformation around the Kussharo Caldera, eastern Hokkaido, captured by dense GNSS observation Network

    Mako Ohzono, Hiroaki Takahashi, Yusaku Ohta

    JpGU 2024　2024/05/29

  69. Estimation of slip distribution of the 2024 Noto Peninsula earthquake based on dense GNSS observation network

    Taisuke Yamada, Yusaku Ohta, Takuya NISHIMURA, Yoshihiro Hiramatsu

    JpGU 2024　2024/05/29

  70. Establishment of a “Consortium to utilize the SoftBank original reference sites for Earth and Space Science” and its operation

    Yusaku Ohta

    JpGU 2024　2024/05/29

  71. InSAR tropospheric correction using dense GNSS tropospheric products

    Yo Fukushima, Yusaku Ohta, Sardila Nurulhikmah Sailellah

    JpGU 2024　2024/05/29

  72. Deformation of the 2020-2024 Noto Peninsula earthquake sequence revealed by combined analysis of multiple GNSS observation networks in central Japan

    Takuya NISHIMURA, Yoshihiro Hiramatsu, Yusaku Ohta

    JpGU 2024　2024/05/29

  73. Evaluation of vertical motion off Tohoku considering uncertainty in GNSS-Acoustic positioning

    Fumiaki Tomita, Motoyuki Kido, Takeshi Iinuma, Yusaku Ohta, Ryota Hino

    JpGU 2024　2024/05/29

  74. GNSS-Acoustic Observation Using the Wave Glider to Detect the Seafloor Crustal Deformation (5)

    Takeshi Iinuma, Motoyuki Kido, Tatsuya Fukuda, Yusaku Ohta, Fumiaki Tomita, Ryota Hino, Hiroaki Takahashi, Takane Hori, Daisuke Sato

    JpGU 2024　2024/05/29

  75. No significant deformation at the axis of the Kuril Trench off Nemuro based on Acoustic Distant Meter survey

    Shoutarou Matsumoto, Motoyuki Kido, Ryota Hino, Yusaku Ohta

    JpGU 2024　2024/05/29

  76. SSE activity before the 2011 Tohoku Earthquake: A revisit based on the reprocessed OBPR data

    Hirata Kyosuke, Ryota Hino, Hideto Otsuka, Taisuke Yamada, Yusaku Ohta

    JpGU 2024　2024/05/28

  77. Development of a real-time source model estimation method for volcanic regions Invited

    Keitaro Ohno, Yusaku Ohta, Naofumi Takamatsu

    JpGU 2024　2024/05/27

  78. Detection of slow slip event from seafloor pressure record using PCA: A case study in Hikurangi Subduction zone

    Hideto Otsuka, Yusaku Ohta, Ryota Hino

    JpGU 2024　2024/05/27

  79. Effects of three-dimensional heterogeneity on post-seismic deformation of inland earthquakes: a case study of the 2016 Kumamoto earthquake

    Miku Ohtate, Yuta Mitsui, Yusaku Ohta

    JpGU 2024　2024/05/31

  80. Shallow interplate slip deficit inferred from GNSS-Acoustic observations off Nemuro

    Fumiaki Tomita, Yusaku Ohta, Motoyuki Kido, Takeshi Iinuma, Naoki Kurosu, Mako Ohzono, Hiroaki Takahashi, Ryota Hino

    JpGU 2024　2024/05/31

  81. Establishment of an open data development environment in the field of geodesy

    Yusuke Yokota, Yusaku Ohta, Hiroshi Takiguchi, Tadafumi Ochi, Yuta Mitsui, Tadashi Ishikawa

    JpGU 2024　2024/05/30

  82. Geodetic observations at deep seafloor – New challenges in collaboration with physical oceanography Invited

    Yusaku Ohta

    JpGU 2024　2024/05/27

  83. Recent progress of the rapid coseismic fault model estimation deduced from dense GNSS data Invited

    Yusaku Ohta

    ICG DRR Task Force FY2024 - Meeting 06　2024/05/27

  84. The 2024 Noto Peninsula Earthquake and Its Fault Model from GNSS Observations

    Yusaku Ohta, Taisuke Yamada, Keisuke Yoshida, Takuya Nishimura, Yoshihiro Hiramatsu

    TOWS-WG meeting - IRIDeS seminar ‘Findings from the 2024 Noto Peninsula Earthquake and Tsunami’　2024/02/21

  85. Evaluation of self-similarity of a coseismic slip by estimating a correlation length in von Karman autocorrelation

    Taisuke Yamada, Yusaku Ohta

    AGU Fall Meeting 2023　2023/12/13

  86. Revisiting seafloor pressure records prior to the 2011 Tohoku earthquake

    Kyosuke Hirata, Ryota Hino, Hideto Otsuka, Yusaku Ohta, Norihisa Usui

    AGU Fall Meeting 2023　2023/12/14

  87. Utilization of the private sector original GNSS network for the earth science

    Yusaku Ohta

    AGU Fall Meeting 2023　2023/12/15

  88. GNSS-acoustic observations using manned and unmanned sea surface platforms along the Kurile-Japan Trench to grasp the interplate locking state and the postseismic deformation of the 2011 Tohoku-oki earthquake

    Takeshi Iinuma, Motoyuki Kido, Fumiaki Tomita, Yusaku Ohta, Tatsuya Fukuda, Ryota Hino, Takane Hori, Hiroaki Takahashi, Kazuo Nakahigashi, Tetsuo No, Yasuyuki Nakamura, Mako Ohzono, Raymundo Omar, Plata Martinez, Daisuke Sato

    AGU Fall Meeting 2023　2023/12/14

  89. Onboard processing and transmission of realtime GNSS-Acoustic data on a waveglider

    Motoyuki Kido, Takeshi Iinuma, Tatsuya Fukuda, Yusaku Ohta, Fumiaki Tomita, Nanami Murai

    AGU Fall Meeting 2023　2023/12/14

  90. GNSS-Acoustic seafloor geodetic observations and their results along the Japan-Kuril trench

    Fumiaki TOMITA, Motoyuki Kido, Takeshi Iinuma, Yusaku Ohta, Ryota Hino, Mako Ohzono, Hiroaki Takahashi, Raymondo Plata-Martínez, Tetsuo No, Kazuo Nakahigashi, Kyosuke Nakamura

    SSJ Fall Meeting 2023　2023/11/01

  91. Revisiting seafloor pressure records prior to the 2011 Tohoku earthquake

    Kyosuke Hirata, Ryota Hino, Hideto Otsuka, Yusaku Ohta, Norihisa Usui

    SSJ Fall Meeting 2023　2023/10/31

  92. SSE detectability of OBP data using principal component analysis: Application to data from Hikurangi and Alaska

    Hideto Otsuka, Yusaku Ohta, Ryota Hino

    SSJ Fall Meeting 2023　2023/10/31

  93. Crustal deformation and mechanism for an earthquake swarm in the northeastern part of the Noto Peninsula based on GNSS observations

    Takuya NISHIMURA, Yoshihiro HIRAMATSU, Yusaku OHTA

    SSJ Fall Meeting 2023　2023/10/31

  94. Crustal structure in the 17th century Kuril earthquake and its linkage to the occurrence of the large shallow slip

    Ryosuke AZUMA, Shuichi Kodaira, Ryota Hino, Gou Fujie, Koichiro Obana, Fumiaki Tomita, Yusaku Ohta

    SSJ Fall Meeting 2023　2023/11/01

  95. ソフトバンク独自基準点データの宇宙地球科学用途利活用コンソーシアム (CSESS) 活動報告 Invited

    太田雄策

    GPS/GNSSシンポジウム　2023/10/26

  96. Detection of Reclaimed Valley Deformations by InSAR Time Series Analysis and GNSS Observations

    Aina Miyajima, Yo Fukushima, Tomotsugu Demachi, Yusaku Ohta

    140th Meeting of the Geodetic Society of Japan　2023/10/13

  97. Separation precision of the spatiotemporal evolution of fault slips and block motions covering the entire southwest Japan

    Yusuke Tanaka, Masayuki Kano, Yusaku Ohta, Takuya Nishimura, Keisuke Yano

    140th Meeting of the Geodetic Society of Japan　2023/10/11

  98. Simultaneous evaluation of correlation length and its application in slip distribution estimation

    Taisuke Yamada, Yusaku Ohta

    140th Meeting of the Geodetic Society of Japan　2023/10/11

  99. Construction of GNSS-observation Knowledge Base at Tohoku University

    Tomotsugu Demachi, Toshiki Kaida, Syuichi Suzuki, Makiko Sato, Yusaku Ohta, Satoshi Miura

    140th Meeting of the Geodetic Society of Japan　2023/10/11

  100. Motion and attitude of the waveglider used in GNSS-A measurement

    Motoyuki Kido, Nanami Murai, Takeshi Iinuma, Tatsuya Fukuda, Yusaku Ohta

    140th Meeting of the Geodetic Society of Japan　2023/10/11

  101. Novel Real-time Observation of High-Resolution Water Vapor Behavior for Detection of Precursors of Cumulonimbus Clouds and investigation of Their Evolutions: Part 1 - Overview of the research project and a plan in FY2023

    ICHIKAWA Ryuchi, OHTA Yusaku, ARAKI Kentaro, TAJIRI Takuya, FUJITA Mikiko, UJIHARA Hideki, YAMADA Takayoshi, JIKE Takaaki, IMAI Hiroshi, MINOWA Masahiro, TAKASHIMA Yuya

    140th Meeting of the Geodetic Society of Japan　2023/10/11

  102. Development of Real-time Pressure Source Model Estimation method with the Quantitative Uncertainty Evaluation

    Keitaro Ohno, Yusaku Ohta, Naofumi Takamatsu, Hiroshi Munekane

    140th Meeting of the Geodetic Society of Japan　2023/10/12

  103. Noise Characteristics of Real-time GNSS Positioning −Toward the Advancement of Real-time Crustal Deformation Monitoring−

    Naofumi Takamatsu, Takayuki Miyazaki, Keitaro Ohno, Shinsuke Murakami, Chinami Shodai, Yusaku Ohta

    140th Meeting of the Geodetic Society of Japan　2023/10/12

  104. Trial of the transient crustal deformation detection using principal component analysis applying to ocean bottom pressure data

    Hideto Otsuka, Yusaku Ohta, Ryota Hino

    140th Meeting of the Geodetic Society of Japan　2023/10/11

  105. Future Perspectives on the GNSS-Acoustic Observation Using the Wave Glider to Detect the Seafloor Crustal Deformation

    Takeshi Iinuma, Motoyuki Kido, Tatsuya Fukuda, Yusaku Ohta, Fumiaki Tomita

    140th Meeting of the Geodetic Society of Japan　2023/10/11

  106. Utilization of private sector GNSS network / Real-time tsunami inundation forecast using GNSS

    Yusaku Ohta

    Small seminar on Kinematic GNSS and Processing at GSI　2023/08/10

  107. Evaluation of the ability to extract crustal deformation signal from ocean bottom pressure time series using principal component analysis

    H. Otsuka, YOhtaR. HinoT, KubotaD, InazuT, InoueN. Takahashi

    28th IUGG General Assembly 2023　2023/07/18

  108. Development of the simultaneous estimation method of slip distribution and its correlation length based on the assumption of self-similarity

    T. Yamada, Y. Ohta

    28th IUGG General Assembly 2023　2023/07/19

  109. A review of the contribution of real-time GNSS to disaster prevention and mitigation in Japan Invited

    Yusaku Ohta

    28th IUGG General Assembly 2023　2023/07/15

  110. Development of a fault model estimation method based on real-time MCMC and its implementation to a real GNSS network

    Yusaku Ohta, Keitaro Ohno, ABE Satoshi, Takayuki Miyazaki, Naofumi Takamatsu, Satoshi Kawamoto

    28th IUGG General Assembly 2023　2023/07/15

  111. Decadal postseismic deformation of the 2011 Tohoku-oki earthquake revealed by GNSS-acoustic observations using manned and unmanned sea surface platforms

    T. Iinuma, M. Kido, F. Tomita, R. Hino, Y. Ohta, T. Fukuda, P.M. Raymundo, T. Hori

    28th IUGG General Assembly 2023　2023/07/18

  112. Transient deformation associated with an earthquake swarm in the Noto Peninsula based on combined analysis of multiple GNSS observation networks

    T. Nishimura, Y. Hiramatsu, Y. Ohta

    28th IUGG General Assembly 2023　2023/07/16

  113. GNSS-Acoustic seafloor geodetic observations using a Wave Glider off Tohoku and their results

    Fumiaki Tomita, Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Tatsuya Fukuda, Ryota Hino

    Japan Geoscience Union Meeting 2023　2023/05/22

  114. A simultaneous correlation length estimation method for coseismic slip distribution estimation under the assumption of self-similarity

    Taisuke Yamada, Yusaku Ohta

    Japan Geoscience Union Meeting 2023　2023/05/21

  115. Forecasting of volcanic ash hazard using integrated monitoring and simulation

    Masato Iguchi, Haruhisa Nakamichi, Takeshi Tameguri, Kosei Takishita, Alexandros Poulidis, Tetsuya Takemi, Akihiko Yamaji, Takashi Maruyama, Masayuki Maki, Kyoka Ishii, Hiroshi Tanaka, Yusaku Ohta, Atsushi Shimizu

    Japan Geoscience Union Meeting 2023　2023/05/23

  116. Accuracy Validation of Kinematic Positioning for Real-Time Analysis of Multi-GNSS Observation Data at Mt. Usu

    Ayuma TAKEDA, Ryo Tanaka, Yuki Nakashima, Makoto Murakami, Atsuo Suzuki, Teruhiro Yamaguchi, Hiroshi Aoyama, Yusaku Ohta

    Japan Geoscience Union Meeting 2023　2023/05/23

  117. Seismic structural characteristics illuminating a large shallow slip zone in the 17th-century Kuril earthquake

    Ryosuke Azuma, Shuichi Kodaira, Ryota Hino, Gou Fujie, Koichiro Obana, Fumiaki Tomita, Yusaku Ohta

    Japan Geoscience Union Meeting 2023　2023/05/24

  118. Noise level of S-net seafloor pressure data in terms of seafloor geodetic use

    Ryota Hino, Tatsuya Kubota, Naotaka YAMAMOTO CHIKASADA, Yusaku Ohta, Hideto Otsuka

    Japan Geoscience Union Meeting 2023　2023/05/23

  119. Development of long-term drift elimination system of OBP for deep-sea observation by "A-0-A" approach and comparison with DONET in-situ calibration results based on Mobile Pressure Calibrator

    Yusaku Ohta, Ryota Hino, Makiko Sato, Syuichi Suzuki, Hideto Otsuka, Hiroaki Kajikawa, Yuya Machida, Shuhei Nishida, Eiichiro Araki

    Japan Geoscience Union Meeting　2023/05/23

  120. Evaluation of the RBR OBP's precision through laboratory pressurization experiments using pressure standard and sea trials

    Syuichi Suzuki, Makiko Sato, Yusaku Ohta, Ryota Hino

    Japan Geoscience Union Meeting 2023　2023/05/23

  121. Slip behavior of the shallow plate interface off-Iwate based on acoustic ranging survey

    Takeru Nishimura, Motoyuki Kido, Ryota Hino, Naoki Uchida, Yusaku Ohta, Syuichi Suzuki, Makiko Sato

    Japan Geoscience Union Meeting 2023　2023/05/23

  122. GNSS-Acoustic Observation Using the Wave Glider to Detect the Seafloor Crustal Deformation (4)

    Takeshi Iinuma, Motoyuki Kido, Tatsuya Fukuda, Yusaku Ohta, Fumiaki Tomita, Raymundo Plata Martinez, Ryota Hino, Hiroaki Takahashi, Takane Hori

    Japan Geoscience Union Meeting 2023　2023/05/23

  123. Reproducibility of MRI.COM-JPN model on seafloor pressure along Nankai Trough: For model-based geodetic signal detection

    Hideto Otsuka, Yusaku Ohta, Norihisa Usui, Ryota Hino, Tatsuya Kubota

    Japan Geoscience Union Meeting 2023　2023/05/22

  124. Crustal deformation associated with an earthquake swarm in the Noto Peninsula based on combined analysis of multiple GNSS observation networks (Part 2)

    Takuya NISHIMURA, Yoshihiro Hiramatsu, Yusaku Ohta

    Japan Geoscience Union Meeting 2023　2023/05/23

  125. Current Status and Future Prospects of the Journal of the Geodetic Society of Japan - Perspectives on Utilization of Data Papers and Data Repositories

    Yusaku Ohta, Yusuke Yoko

    Japan Geoscience Union Meeting 2023　2023/05/25

  126. GNSSによる地殻変動監視の高度化とその防災・減災への活用

    太田雄策

    研究集会「地殻変動観測研究のフロンティア」　2023/03/21

  127. Fault friction properties inferred from the early afterslip within one hour after the 2011 Tohoku-Oki EQ estimated by GNSS carrier phase change

    Yusuke Tanaka, Yusaku Ohta, Shin’ichi Miyazaki

    Slow-To-Fast Earthquake Workshop in Tainan　2023/03/13

  128. An attempt of transient tectonic signals detection from DONET seafloor pressure record using principal component analysis

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Tatsuya Kubota, Daisuke Inazu

    AGU Fall Meeting　2022/12/14

  129. Rapid postseismic uplift along the Pacific coast of northeastern Japan after the 2011 Tohoku-oki earthquake and forecasting pre-event relative sea-level recovery

    Sambuddha Dhar, Jun Muto, Yoshiaki Ito, Satoshi Miura, James Moore, Yusaku Ohta, Takeshi Iinuma

    AGU Fall Meeting 2022　2022/12/14

  130. Near-Trench Postseismic Subsidence Following the 2011 Tohoku-oki Earthquake Revealed by GNSS-Acoustic Observations

    Fumiaki Tomita, Motoyuki Kido, Chie Honsho, Takeshi Iinuma, Yusaku Ohta, Ryota Hino, Tianhaozhe Sun, Haipeng Luo, Kelin Wang

    AGU Fall Meeting 2022　2022/12/16

  131. Earthquake swarm and transient crustal deformation in the Noto Peninsula, central Japan, based on combined analysis of multiple GNSS networks

    Takuya Nishimura, Yoshihiro Hiramatsu, Yusaku Ohta

    AGU Fall Meeting 2022　2022/12/14

  132. 東北沖における近年の GNSS音響海底測地観測 とその成果

    富田 史章, 木戸 元之, 飯沼 卓史, 太田 雄策, 本荘 千枝, 日野 亮太, 野 徹雄, 中東 和夫

    日本地震学会2022年度秋季大会　2022/10/24

  133. 複数 GNSS観測網の統合解析に基づく能登半島群発地震に伴う地殻変動

    西村 卓也, 平松 良浩, 太田 雄策

    日本地震学会2022年度秋季大会　2022/10/24

  134. 千島海溝沿い根室沖における海底測地観測

    富田 史章, 木戸 元之, 太田 雄策, 日野 亮太, 飯沼 卓史, 本荘 千枝, 大園 真子, 高橋 浩晃

    日本地震学会2022年度秋季大会　2022/10/24

  135. ソフトバンク独自基準点データの宇宙地球科学用途利活用コンソーシアムの構築 Invited

    太田雄策, 西村卓也, 青木陽介, 福島 洋, 藤田実季子, 大塚雄一, 鷺谷 威, 伊藤武男, 古屋正人, 大園真子, 大西建広, 池田将平, 伊田裕一

    GPS/GNSSシンポジウム2022　2022/10/20

  136. 複数GNSS観測網の統合解析に基づく能登半島群発地震に伴う地殻変動

    西村卓也, 平松良浩, 太田雄策

    日本測地学会第138回講演会　2022/10/07

  137. ソフトバンク独自基準点データの宇宙地球科学用途利活用コンソーシアムの構築

    太田雄策, 西村卓也, 青木陽介, 福島 洋, 藤田実季子, 大塚雄一, 鷺谷 威, 伊藤武男, 古屋正人, 大園真子, 大西建広, 池田将平, 伊田裕一

    日本測地学会第138回講演会　2022/10/06

  138. 相関距離を未知とした自己相似性を断層すべりの先験情報としたすべり分布推定手法の開発

    山田太介, 太田雄策

    日本測地学会第138回講演会　2022/10/06

  139. 様々な海況下でのウェーブグライダーの運動姿勢について

    木戸元之, 飯沼卓史, 福田達也, 太田雄策, 富田史章

    日本測地学会第138回講演会　2022/10/05

  140. ウェーブグライダーを用いたGNSS-音響測距結合方式の海底地殻変動観測 (その３)

    飯沼卓史, 木戸元之, 福田達也, 太田雄策, 富田史章, 有吉慶介, 永野 憲, プラタ-マルティネス ライムンド, 日野亮太, 高橋浩晃, 堀 高峰

    日本測地学会第138回講演会　2022/10/05

  141. Toward the construction of a common 3D multi-scale and multi-parameter model by integrating various seismic velocity structure model

    Ayako Nakanishi, Takahiro Maeda, Nobuyuki Morikawa, Shigeki Senna, Narumi Takahashi, Hiromitsu Nakamura, Hiroyuki Fujiwara, Katsuhiko Shiomi, Yusaku Ohta, Takane Hori, Shuichi Kodaira

    JpGU Meeting 2022　2022/05/22

  142. GNSS-Acoustic seafloor geodetic observations using a Wave Glider off Tohoku

    Fumiaki Tomita, Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Chie Honsho, Tatsuya Fukuda

    JpGU Meeting 2022　2022/05/27

  143. PCA-based noise reduction of seafloor pressure data to improve tectonic transient signal detection -Application to DONET long-term continuous data

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Tatsuya Kubota, Daisuke Inazu

    JpGU Meeting 2022　2022/05/24

  144. Development of the algorithm to estimate the coseismic fault and its uncertainty using Hamiltonian Monte Carlo

    Taisuke Yamada, Yusaku Ohta, Keitaro Ohno

    JpGU Meeting 2022　2022/05/23

  145. Fault friction properties inferred from the early afterslip of the 2011 Tohoku-Oki EQ estimated by the PTS analysis

    Yusuke Tanaka, Yusaku Ohta, SHINICHI MIYAZAKI

    JpGU Meeting 2022　2022/05/24

  146. Development of the low-cost GNSS receiver and its application to the earth science

    Yusaku Ohta

    JpGU Meeting 2022　2022/05/25

  147. 東北大・理からの提案 (2) 海域地震研究

    太田雄策

    次期計画検討シンポジウム　2022/05/17

  148. 災害誘因評価・即時予測部会からの提案

    太田雄策, 為栗 健

    次期計画検討シンポジウム　2022/05/17

  149. Development of the prototype system for the long-term OBP drift elimination using the “A-0-A” approach

    Yusaku Ohta, Ryota Hino, Makiko Sato, Syuichi Suzuki, Hideto Otsuka, Hiroaki Kajikawa, Tokihiko Kobata

    Ocean Science Meeting 2022　2022/03/04

  150. Application of GNSS for real-time prediction of geohazards and its transformation to disaster information Invited

    Yusaku Ohta

    Geospatial Capacity Development Conference on GNSS applications and DRR　2022/01/17

  151. 民間GNSS観測点を用いた地殻変動即時把握の可能性

    太田雄策, 大園真子

    2021年度「固体地球科学的諸現象のリアルタイム監視予測システムと利活用」　2022/01/07

  152. 千島海溝根室沖における複合海底測地観測

    太田雄策, 本荘千枝, 佐藤真樹子, 鈴木秀市, 東龍介, 日野亮太, 木戸元之, 富田史章, 大園真子, 高橋浩晃, 飯沼卓史, 篠原雅尚

    海と地球のシンポジウム2021　2021/12/21

  153. Extracting Near-field In-situ Ground Motion Waveforms with Large Displacements of the 2011 Tohoku-Oki Earthquake from Ocean Bottom Pressure Change inside the Focal Area

    Tatsuya Kubota, Tatsuhiko Saito, Hiroaki Tsushima, Ryota Hino, Yusaku Ohta, Syuichi Suzuki, Daisuke Inazu

    AGU Fall Meeting 2021　2021/12/17

  154. Development of the low-cost GNSS receiver and data logger system for the geodetic purpose

    Yusaku Ohta

    AGU Fall Meeting 2021　2021/12/16

  155. Episodic burst of earthquakes near the Japan Trench following migration of shallow tectonic tremor

    Kazuaki Ohta, Yoshihiro Ito, Ryota Hino, Yusaku Ohta, Ryosuke Azuma, Masanao Shinohara, Kimihiro Mochizuki, Toshinori Sato, Yoshio Murai

    AGU Fall Meeting 2021　2021/12/14

  156. GNSS-Acoustic observation using the Wave Glider to detect the seafloor crustal deformation off the Pacific coast of Northeastern Japan

    Takeshi Iinuma, Motoyuki Kido, Tatsuya Fukuda, Fumiaki Tomita, Yusaku Ohta, Chie Honsho, Ryota Hino

    AGU Fall Meeting 2021　2021/12/14

  157. Efficient estimation of the fault model using the GNSS data based on the Hamiltonian Monte Carlo approach

    Taisuke Yamada, Yusaku Ohta

    AGU Fall Meeting 2021　2021/12/13

  158. Development of Wideband Receiver for Nobel Ground-based Microwave Radiometer(II)

    Hideki Ujihara, Ryuichi Ichikawa, Shinsuke Satoh, Mamoru Sskido, Yusaku Ohta, Basara Miyahara, Hiroshi Munekane, Tomokadu Kobayashi, Taketo Nagasaki, Osamu Tajima, Kentaro Araki, Takuya Tajiri, Takeshi Matsushima, Hiroshi Imai, Hiroshi Takiguchi, Hiroshi Takeuchi, Takaaki Jike, Tomoaki Oyama, Nobuo Matsushim, Tatsuya Momotani, Kenji Utsunomiy

    The 136th meeting of the Geodetic Society of Japan　2021/11/18

  159. Potential for crustal deformation monitoring using dense GNSS network by private sector

    Yusaku Ohta, Mako Ohzono

    The 136th meeting of the Geodetic Society of Japan　2021/11/18

  160. Coseismic fault model estimation using the Hamiltonian Monte Carlo method and its comparison with the Metropolis-Hastings method

    Taisuke Yamada, Yusaku Ohta

    The 136th meeting of the Geodetic Society of Japan　2021/11/17

  161. Development of a deep sea self-calibrated OBP with the A-0-A method for detection of long-term crustal deformation (fourth report)

    Yusaku Ohta, Ryota Hino, Makiko Sato, Syuichi Suzuki, Hideto Otsuka, Hiroaki Kajikawa, Tokihiko Kobat

    The 136th meeting of the Geodetic Society of Japan　2021/11/17

  162. Seismicity around the subducting seamount in the Japan-Kuril trenches junction detected by a broad-band OBS array and S-net observatory

    Ryosuke AZUMA, Susumu Kawakubo, Hidenobu Takahashi, Yusaku Ohta, Ryota Takagi, Syuichi Suzuki, Makiko Sato, Ryota Hino, Shinichi Tanaka, Masanao Shinohara

    SSJ Fall Meeting 2021　2021/10/15

  163. GNSS-Acoustic observations using a Wave Glider and the recent seafloor crustal deformation off Tohoku

    Fumiaki TOMITA, Takeshi Iinuma, Motoyuki Kido, Chie Honsho, Yusaku Ohta, Tatsuya Fukuda

    SSJ Fall Meeting 2021　2021/10/15

  164. Spatial and temporal characteristic of the early afterslip following the 2011 Tohoku-Oki earthquake deduced from onshore and offshore geodetic data

    Putra MAULIDA, Yusaku OHTA, Ryota HINO, Takeshi IINUMA, Ryoichiro AGATA

    SSJ Fall Meeting 2021　2021/10/15

  165. Coseismic fault model estimation using the Hamiltonian Monte Carlo method and its comparison with the Metropolis-Hastings method

    Taisuke Yamada, Yusaku Ohta, Keitaro Ohno

    SSJ Fall Meeting 2021　2021/10/14

  166. Continuous estimation of the transition process from coseismic rupture to initial postseismic slip based on the PTS analysis

    Yusuke TANAKA, Yusaku Ohta, Shin'ichi Miyazaki

    SSJ Fall Meeting 2021　2021/10/14

  167. Interpretation for variation in the incoming Pacific Plate structure around the Kuril Trench axial region by an OBS/MCS seismic survey

    Ryosuke Azuma, Shuichi Kodaira, Ryota Hino, Gou Fujie, Koichiro Obana, Fumiaki Tomita, Yusaku Ohta

    Japan Geoscience Union Meeting 2021　2021/06/06

  168. Resolving 3D rheology of northeastern Japan using postseismic deformation following the 2011 Tohoku-oki earthquake

    Jun Muto, Dhar Sambuddha, James Daniel, Paul Moore, Satoshi Miura, Yusaku Ohta, Takeshi Iinuma

    Japan Geoscience Union Meeting 2021　2021/06/06

  169. Improvement of spatial resolution and evaluation of uncertainty for the coseismic slip distribution of the 2011 Tohoku-oki Earthquake

    Fumiaki Tomita, Takeshi Iinuma, Motoyuki Kido, Ryota Hino, Yusaku Ohta, Ryoichiro Agata, Takane Hori, Naoki Uchida

    Japan Geoscience Union Meeting 2021　2021/06/06

  170. Detectability of short-term seafloor deformation by S-net pressure observation

    Ryota Hino, Tatsuya Kubota, Naotaka YAMAMOTO CHIKASADA, Yusaku Ohta, Hideto Otsuka

    Japan Geoscience Union Meeting 2021　2021/06/06

  171. Ground motion waveforms in the epicentral area of the 2011 Tohoku-Oki earthquake with large displacements, retrieved from ocean-bottom dynamic pressure change data

    Ground motion waveforms in, the epicentral area of th, Tohoku-Oki earthquake with, large displacements, retrieved from ocean-bottom dynamic, pressure change data

    Japan Geoscience Union Meeting 2021　2021/06/06

  172. Real-time Tsunami Inundation Forecast in Japan - Present and Future

    Shunichi Koshimura, Ryota Hino, Yusaku Ohta, Akihiro Musa, Takayuki Suzuki, Takashi Abe, Hiroaki Kobayashi

    Japan Geoscience Union Meeting 2021　2021/06/06

  173. Development of microseismicity catalog near the Japan Trench shallow slow earthquake region using a deep learning module

    Shukei Ohyanagi, Kazuaki Ohta, Yoshihiro Ito, Ryota Hino, Yusaku Ohta, Ryosuke Azuma, Masanao Shinohara, Kimihiro Mochizuki, Toshinori Sato, Yoshio Murai

    apan Geoscience Union Meeting 2021　2021/06/06

  174. Seismicity around the subducted seamount in the trench-trench junction, southern off Hokkaido, by a broadband OBS array

    Ryosuke Azuma, Susumu Kawakubo, Hidenobu Takahashi, Ryota Hino, Yusaku Ohta, Ryota Takagi, Syuichi Suzuki, Makiko Sato, Tanaka Shinichi, Masanao Shinohara

    Japan Geoscience Union Meeting 2021　2021/06/06

  175. Semi-realtime transmission of GNSS-A data using a Wave Glider

    Motoyuki Kido, Tatsuya Fukuda, Yusaku Ohta, Fumiaki Tomita, Chie Honsho, Takeshi Iinuma

    Japan Geoscience Union Meeting 2021　2021/06/05

  176. GNSS-Acoustic observations using a Wave Glider and their results

    Fumiaki Tomita, Takeshi Iinuma, Motoyuki Kido, Yusaku Ohta, Chie Honsho, Tatsuya Fukuda, Takane Hori

    Japan Geoscience Union Meeting 2021　2021/06/05

  177. Characteristic of depth dependence and annual variation of OBP time series in DONET

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Tatsuya Kubota, Daisuke Inazu

    Japan Geoscience Union Meeting 2021　2021/06/05

  178. Sensitivity analysis with large-scale 3D finite element crust structure model for seafloor geodetic constraints on coseismic slip and interseismic slip-deficit distributions

    Sota Murakami, Tsuyoshi Ichimura, Kohei Fujita, Takane Hori, Yusaku Ohta

    Japan Geoscience Union Meeting 2021　2021/06/05

  179. Volcano monitoring based on InSAR Time-series Analysis

    Satoshi Miura, Morishita Yu, Yusaku Ohta, Tomotsugu Demachi, Micaela Colavita

    Japan Geoscience Union Meeting 2021　2021/06/04

  180. Urgent observation of seafloor crustal movement and installation of seafloor seismographs in preparation for future earthquakes off the east coast of Aomori Prefecture

    Takane Hori, Takeshi Iinuma, Fumiaki Tomita, Motoyuki Kido, Chie Honsho, Ryosuke Azuma, Chi-Hsien Tang, Yusaku Ohta, Ryoko Nakata, Ryota Hino, Masanao Shinohara, Shuichi Kodaira

    Japan Geoscience Union Meeting 2021　2021/06/04

  181. Development of Wideba;Receiver for Nobel Ground-based Microwave Radiometer;field experiments of the;ne;GHz wide-b;receiver

    Ryuichi Ichikawa, Hideki Ujihara, Shinsuke Satoh, Yusaku Ohta, Basara Miyahara, Hiroshi Munekane, Taketo Nagasaki, Osamu Tajima, Kentaro Araki, Takuya Tajiri, Hiroshi Takiguchi, Takeshi Matsushima, Nobuo Matsushima, Tatsuya Momotani, Kenji Utsunomiya

    Japan Geoscience Union Meeting 2021　2021/06/04

  182. Development and assessment of the low-cost multi frequencies GNSS receiver and logger system

    Yusaku Ohta

    Japan Geoscience Union Meeting 2021　2021/06/04

  183. Early afterslip of the 2011 Tohoku-Oki sequence estimated by the GNSS carrier phase to fault slip approach

    Yusuke Tanaka, Yusaku Ohta, SHINICHI MIYAZAKI

    Japan Geoscience Union Meeting 2021　2021/06/04

  184. Preliminary results of sea-floor crustal deformation measured by GNSS-Acoustic technique in Nemuro-Oki, southwestern part of Kuril Trench

    Yusaku Ohta, Motoyuki Kido, Chie Honsho, Yukiho Kimura, Makiko Sato, Syuichi Suzuki, Ryosuke Azuma, Mako Ohzono, Hiroki Aota, Hiroaki Takahashi, Fumiaki Tomita, Takeshi Iinuma, Masanao Shinohara, Ryota Hino

    Japan Geoscience Union Meeting 2021　2021/06/03

  185. Applicability of the Hamiltonian Monte Carlo method for single rectangular fault estimation

    Taisuke Yamada, Yusaku Ohta

    Japan Geoscience Union Meeting 2021　2021/06/03

  186. GNSS-Acoustic Observation Using the Wave Glider to Detect the Seafloor Crustal Deformation (2)

    Iinuma T, M. Kido, T. Fukuda, Y. Ohta, F. Tomita, R. Hino

    SSJ Fall meeting 2020　2020/10/30

  187. Limitation of the interplate coupling estimation at Kuril Trench around Nemuro-oki, eastern Hokkaido, Japan deduced from GEONET, and the possible contribution of newly constructed GNSS-A sites

    Yuki Aota, Mako Ohzono, Hiroaki Takahashi, Yusaku Ohta

    SSJ Fall meeting 2020　2020/10/30

  188. Continuous estimation of coseismic and early postseismic slip of the 2011 Tohoku-Oki sequence using PTS analysis

    Yusuke Tanaka, Yusaku Ohta, Shin'ichi Miyazaki

    SSJ Fall meeting　2020/10/30

  189. Continuous estimation of coseismic and early postseismic slip of the 2011 Tohoku-Oki sequence using PTS analysis

    Tanaka Y, Y. Ohta, S. Miyazaki

    134th Meeting of the Geodetic Society of Japan　2020/10/22

  190. Application of a non-tidal ocean model to DONET ocean bottom pressure records and its evaluation

    Otsuka H, Y. Ohta, R. Hino, T. Kubota, D. Inazu

    134th Meeting of the Geodetic Society of Japan　2020/10/22

  191. Development of a deep sea self-calibrated OBP with the A-0-A method for detection of long-term crustal deformation (Third report)

    Yusaku Ohta, Ryota Hino, Makiko Sato, Syuichi Suzuki, Hiroaki Kajikawa, Tokihiko Kobata

    134th Meeting of the Geodetic Society of Japan　2020/10/22

  192. Onset of GNSSAcoustic observation for horizontal and vertical movements off Nemuro region using a triangular PXP array with an optional centered-PXP

    Kimura, Y, M. Kido, Y. Ohta, C. Honsho, F. Tomita

    134th Meeting of the Geodetic Society of Japan　2020/10/22

  193. Detection of seafloor crustal deformation by GNSS-Acoustic measurement using a Wave Glider - preliminary results of a trial observation for long-term operation

    Tomita, F, M. Kido, Y. Ohta, T. Iinuma, T. Fukuda, C. Honsho

    134th Meeting of the Geodetic Society of Japan　2020/10/22

  194. Investigation of inputs to subduction zones: Influence of tectonic processes on the incoming plate

    Ryosuke Azuma, Shuichi Kodaira, Ryota Hino, Gou Fujie, Koichiro Obana, Fumiaki Tomita, Yusaku Ohta

    JpGU-AGU Joint Meeting 2020　2020/07/13

  195. Assessment of the non-tidal component contributions to the ocean bottom pressure time series around Japan

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Tatsuya Kubota, Daisuke Inazu

    JpGU-AGU Joint Meeting 2020　2020/07/16

  196. Launch of GNSS-Acoustic observation for horizontal and vertical movements off Nemuro using a triangular PXP array with an optional centered-PXP

    Yukiho Kimura, Motoyuki Kido, Yusaku Ohta, Chie Honsho, Fumiaki Tomit

    JpGU-AGU Joint Meeting 2020　2020/07/13

  197. Detection of the volcanic plume by 19 February 2018 eruption of Mount Sinabung deduced from GNSS post-fit phase residual analysis

    Yusaku Ohta, Masato Iguchi, Gunawan Hendra, Umar Rosadi, Estu Kriswati

    JpGU-AGU Joint Meeting 2020　2020/07/14

  198. Operation of REGARD: Real-Time GNSS analysis system in Japan

    Hiroki MURAMATSU, Satoshi ABE, Satoshi KAWAMOTO, Yusaku Ohta

    JpGU-AGU Joint Meeting 2020　2020/07/13

  199. Changes in carrier phase residuals of GPS satellite radio waves following the eruptions of Sakurajima -Data analysis from 2013 to 2019-

    Yukako Asakura, Takeshi Nishimura, Yusaku Ohta, Masayuki Kano

    JpGU-AGU Joint Meeting 2020　2020/07/14

  200. Real–time uncertainties evaluation of coseismic fault models and Tsunami inundation deduced from GNSS observations

    Keitaro Ohno, Yusaku Ohta

    JpGU-AGU Joint Meeting 2020　2020/07/13

  201. Performance assessment of the GNSS carrier phase to fault slip approach and its feasibility for seismic monitoring

    Yusuke Tanaka, Yusaku Ohta

    JpGU-AGU Joint Meeting 2020　2020/07/13

  202. Trial of the crustal deformation detection accompanied with the tremor activities in Fukushima-Oki deduced from the ocean bottom pressure gauge data

    Hideto Otsuka, Yusaku Ohta, Ryota Hino, Kazuaki Ohta

    JpGU-AGU Joint Meeting 2020　2020/07/12

  203. 震源断層モデル推定の不確実性リアルタイム評価手法の開発 −2019年山形沖地震への適用−

    大野圭太郎, 太田雄策, 日野亮太

    東北地域災害科学研究集会　2019/12/26

  204. Spatial and temporal developmenent of the early afterslip following the 2011 Tohoku-Oki earthquake using onshore GNSS and offshore pressure data

    Putra Maulida, Yusaku Ohta, and Ryota Hino

    AGU Fall Meeting 2019　2019/12/13

  205. Development of the prototype system for the long-term OBP drift elimination using the “A-0-A” approach

    Yusaku Ohta, Ryota Hino, Makiko Sato, Syuichi Suzuki (Tohoku Univ.), Hiroaki Kajikawa, and Tokihiko Kobata

    AGU Fall Meeting 2019　2019/12/11

  206. Quantitative uncertainty estimation of the coseismic fault model based on the real-time GNSS time series

    Keitaro Ohno, Yusaku Ohta

    AGU Fall Meeting 2019　2019/12/11

  207. Feasibility of the GNSS carrier phase to fault slip approach for estimation of coseismic and postseismic slip phenomena: A case study of the 2011 Tohoku-Oki sequence

    Yusuke Tanaka, Yusaku Ohta, Shinichi Miyazaki

    AGU Fall Meeting 2019　2019/12/09

  208. Development of a real-time buoy observation system for tsunami and crustal displacement and its bottom pressure continuous records

    Narumi Takahashi, Kentaro Imai, Motoyuki Kido, Yusaku Ohta, Tatsuya Fukuda, Yasuhisa Ishihara, Hiroshi Ochi, Ryota Hino

    SSJ 2019　2019/09/16

  209. Attempt to detect LFTs by clustering short-period OBS records

    Hidenobu Takahashi, Ryota Hino, Yusaku Ohta, Naoki Uchida, Syuichi Suzuki, Masanao Shinohara, Takanori Matsuzawa

    SSJ 2019　2019/09/18

  210. Real-time automatic uncertainty estimation of GNSS-based coseismic single rectangular fault model: a case study of 2019 Yamagata-Oki earthquake

    Keitaro Ohno, Yusaku Ohta,, Hironori Muramatsu, Satoshi Abe

    SSJ 2019　2019/09/16

  211. Construction of the sea-floor geodesy network in Nemuro-Oki, the southwestern part of the Kuril Trench

    Yusaku Ohta, Motoyuki Kido, Ryosuke Azuma, Makiko Sato, Syuichi Suzuki, Ryusuke Yamamoto, Hidenobu Takahashi, Yukiho Kimura, Hideto Otsuka, Chie Honsho, Ryota Hino,Mako Ohzono, Kazumi Okada, Yuki Aota, Hiroaki Takahashi,Masanao Shinohara, Fumiaki Tomita,Toshiya Kanamatsu, Kan-Hsi Hsiung, Takeshi Iinuma

    SSJ Fall Meeting 2019　2019/09/16

  212. Feasibility of the GNSS carrier phase to fault slip approach for the estimation of slip phenomenas in subduction zone

    Yusuke Tanaka, Yusaku Ohta, Shin'ichi Miyazaki

    JpGU 2019　2019/05/27

  213. Estimation of the early afterslip location of the 2011 Tohoku-Oki earthquake using onshore GNSS and offshore pressure data

    Putra Maulida, Yusaku Ohta, and Ryota Hino

    JpGU 2019　2019/05/26

  214. Expectations to more realistic and accurate Green’s function for the real-time estimation of the coseismic fault model

    Yusaku Ohta and Keitaro Ohno

    JpGU 2019　2019/05/26

  215. Development of “real-time” uncertainty evaluation algorithm for the estimated coseismic fault model using MCMC approach

    Keitaro Ohno and Yusaku Ohta

    JpGU 2019　2019/05/30

  216. Accuracy and precision assessment of the real-time kinematic GNSS time series

    Yusaku Ohta, Misae Imano, and Motoyuki Kido

    JpGU 2019　2019/05/27

  217. Prototype of deep-sea ocean bottom pressure recorder with self-calibration capability using “A-0-A” approach for detection of long-term crustal deformation

    Yusaku Ohta, Ryota Hino, Syuichi Suzuki, Makiko Sato, Yui Nishimagi (Tohoku univ.), Hiroaki Kajikawa, Tokihiko Kobata

    JpGU 2019　2019/05/27

  218. Quantitative real-time uncertainty estimation of the tsunami inundation using HPC technologies International-presentation Invited

    OHTA Yusaku

    29th Workshop on Sustained Simulation Performance　2019/03/29

  219. リアルタイムGNSSを用いた断層すべり分布推定の不確実性リアルタイム定量評価の試み

    大野圭太郎, 太田雄策

    研究集会「地震動のリアルタイム解析：防災・減災に向けた即時的な活用を目指して」　2019/01/11

  220. GNSS搬送波位相から直接断層すべりを推定する手法による地震すべり分布のリアルタイム推定

    田中優介, 太田雄策, 宮崎真一

    研究集会「地震動のリアルタイム解析：防災・減災に向けた即時的な活用を目指して」　2019/01/11

  221. Quantitative assessment of the “A-0-A” approach for the long-term OBP drift elimation by the results of the laboratory experiments International-presentation

    Yui Nishimagi, Yusaku Ohta, Syuichi Suzuki, Makiko Sato, Hiroaki Kajikawa, Tokihiko Kobata

    AGU Fall meeting 2018　2018/12/13

  222. Estimation of coseismic slip distribution via GNSS carrier phase to fault slip approach: Possibility of the application to near-field tsunami forecasting International-presentation Invited

    Yusaku Ohta, Yusuke Tanaka, Shinichi Miyazaki

    AGU Fall meeting 2018　2018/12/12

  223. Quantitative uncertainty estimation for the coseismic fault model and its slip heterogeneity using real-time GNSS data International-presentation

    Keitaro Ohno, Yusaku Ohta

    AGU Fall meeting 2018　2018/12/11

  224. Role of Real-Time GNSS in Near-Field Tsunami Forecasting International-presentation Invited

    OHTA Yusaku

    International Top-level Forum on Engineering Science and Technology Development Strategy　2018/10/28

  225. 2016 年熊本地震後のGNSSによる地殻変動観測(3)

    中尾 茂, 松島 健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷 威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦 哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見

    日本測地学会130回講演会プログラム　2018/10/17

  226. PTS解析における未知パラメータ間分離精度の定量評価

    田中優介, 太田雄策, 宮崎真一

    日本測地学会130回講演会プログラム　2018/10/17

  227. 非定常地殻変動の把握を目指したA-0-A 方式による深海対応海底水圧計ドリフト補正システムの開発

    太田雄策, 西間木佑衣, 日野亮太, 鈴木秀市, 佐藤真樹子, 梶川宏明, 小畠時彦

    日本測地学会130回講演会プログラム　2018/10/17

  228. DOP を用いた係留ブイ GNSS-A 観測の測位精度異方性の評価

    今野美冴, 木戸元之, 太田雄策, 本荘千枝, 日野亮太

    日本測地学会130回講演会プログラム　2018/10/17

  229. Early Afterslip modelling of 2011 Tohoku Oki Earthquake (Mw9.0) using geodetic data (Preliminary Result)

    Putra Maulida, Yusaku Ohta, Ryota Hino

    GSJ 130th meeting　2018/10/16

  230. 次世代超高感度マイクロ波放射計の開発 -序報-

    市川隆一, 氏原秀樹, 佐藤晋介, 雨谷 純, 太田雄策, 宮原伐折羅, 宗包浩志, 長崎岳人, 田島 治, 荒木健太郎, 田尻拓也, 松島 健, 瀧口博士, 松島喜雄, 桃谷辰也

    日本測地学会130回講演会プログラム　2018/10/16

  231. リアルタイムGNSSによる断層すべり分布の不確実性定量評価の試み

    大野圭太郎, 太田雄策

    日本測地学会130回講演会プログラム　2018/10/16

  232. 2011 年東北沖地震の余効変動における不均質レオロジーの影響

    伊藤嘉秋, 三浦 哲, 武藤 潤, 太田雄策, Moore James, 飯沼卓史

    日本測地学会130回講演会プログラム　2018/10/16

  233. Effect of heterogeneous rheology in postseismic deformation following the 2011 Tohoku-oki earthquake

    Yoshiaki Ito, Satoshi Miura, Jun Muto, Yusaku Ohta, James Moore, Takeshi Iinuma

    SSJ Fall meeting 2018　2018/10/10

  234. Modelling of the early postseismic deformation of the 2011 Tohoku-oki Earthquake taking non-linear rheology into account

    Takeshi Iinuma, Ryoichiro Agata, Takane Hori, Yusaku Ohta, Ryota Hino

    SSJ Fall meeting 2018　2018/10/10

  235. Attempt to detect VLFE-like events based on similarities of spectra and amplitude decay

    Hidenobu Takahashi, Ryota Hino, Ohta Yusaku, Naoki Uchida, Syuichi Suzuki, Masanao Shinohara, Matsuzawa Takanori

    SSJ Fall Meeting　2018/10/10

  236. Coseismic Slip Distribution of the 2016 Kumamoto Earthquake: via the GNSS Carrier Phase to Fault Slip Approach

    Yusuke Tanaka, Yusaku Ohta, Shinichi Miyazaki

    SSJ Fall Meeting 2018　2018/10/10

  237. Real-time Coseismic Slip Estimation via the GNSS Carrier Phase to Fault Slip Approach: Potential Contribution for Redundant Tsunami Forecast system International-presentation

    Yusuke Tanaka, Yusaku Ohta, Shinichi Miyazaki

    10th ACES International Workshop　2018/09/27

  238. Quantitative Uncertainty Estimation for the Coseismic Fault Model and its Slip Heterogenity Using Real-time GNSS Data International-presentation

    Keitaro Ohno, Yusaku Ohta

    10th ACES International Workshop　2018/09/27

  239. Role of Real-Time GNSS in Near-Field Tsunami Forecasting International-presentation

    OHTA Yusaku

    10th ACES International Workshop　2018/09/27

  240. Quantitative Uncertainties Estimation of the rapidly estimated coseismic fault model based on the real-time GNSS data International-presentation

    Yusaku Ohta, Keitaro Ohno

    AOGS 2018　2018/06/07

  241. Evaluation of long-term drift characteristic of the OBP based on the laboratory experiment with the high accuracy reference pressure balance and apply it to the actual observation data

    Yui Nishimagi, Yusaku Ohta, Ryota Hino, Syuichi Suzuki, Makiko Sato, Hiroaki Kajikawa, Tokihiko Kobata

    JpGU 2018　2018/05/24

  242. Nonlinear mechanical coupling between viscoelastic relaxation and deep afterslip in the post-seismic deformation of the 2011 Tohoku-oki earthquake

    Jun Muto, James Daniel, Paul Moore, Sylvain Barbot, Takeshi Iinuma, Yusaku Ohta, Shunsuke Horicuhi, Hikaru Iwamori

    JPGU 2018　2018/05/23

  243. Improvements of the GEONET real-time anlysis system (REGARD) for more reliable operation

    Satoshi Kawamoto, Naofumi Takamatsu, Satoshi Abe, Kohei Miyagawa, Yusaku Ohta

    JpGU 2018　2018/05/23

  244. Characteristics of seismograms of VLFEs recorded by short period OBSs in the northern Japan Trench

    Hidenobu Takahashi, Ryota Hino, Yusaku Ohta, Naoki Uchida, Syuichi Suzuki, Masanao Shinohara, Takanori Matsuzawa

    JpGU 2018　2018/05/23

  245. Trial of quantitative uncertainties estimation for the rapidly estimated coseismic fault model deduced from real-time GNSS data using MCMC approach

    Keitrao Ohno, Yusaku Ohta

    JpGU 2018　2018/05/23

  246. Estimation of coseismic slip distribution for the mainshock and foreshock of the 2016 Kumamoto earthquake using PTS

    Yusuke Tanaka, Yusaku Ohta, Shinichi Miyazaki

    JpGU 2018　2018/05/20

  247. Progress report on seafloor geodetic observation in Japan International-presentation Invited

    OHTA Yusaku

    UNAVCO Science Workshop 2018　2018/03/28

  248. 地震規模即時推定のためのGNSSデータ解析の高度化

    OHTA Yusaku

    「災害の軽減に貢献するための地震火山観測研究計画」H29年度 成果報告シンポジウム　2018/03/14

  249. Possibility of the real-time dynamic strain field monitoring deduced from GNSS data: case study of the 2016 Kumamoto earthquake sequence International-presentation

    Yusaku Ohta, Mako Ohzono, Hirotaki Takahashi, Satoshi Kawamoto, Ryota Hino

    AGU Fall meeting 2017　2017/12/13

  250. How the real-time GNSS can contribute to near field tsunami early warning? International-presentation Invited

    OHTA Yusaku

    ICG-12　2017/12/03

  251. Future prospect of the rapid coseismic fault model estimation using the real-time GNSS data International-presentation Invited

    OHTA Yusaku

    World BOSAI Forum 2017　2017/11/27

  252. 重錘形圧力天びんを用いた海底水圧計ドリフト特性評価 (序報)

    太田雄策, 日野亮太, 鈴木秀市, 佐藤 真樹子, 伊藤喜宏, 梶川宏明, 小畠時彦

    日本測地学会第128回講演会　2017/10/04

  253. GNSS搬送波位相から直接断層すべりを推定する手法の, 2016年熊本地震への適用

    田中優介, 太田雄策, 宮崎真一

    日本測地学会第128回講演会　2017/10/04

  254. GEONETリアルタイム解析システムREGARDによるリアルタイム断層推定

    高松直史, 川元智司, 宮川康平, 阿部聡, 太田雄策, 西村卓也

    日本測地学会第128回講演会　2017/10/04

  255. Slip rate of the North Anatolian Fault at the western part of the Sea of Marmara through seafloor geodetic measurement for two years International-presentation

    Yamamoto, R, M. Kido, Y. Ohta, N. Takahashi, Y. Yamamoto, D. Kalafat, A. Pinar, H. Ozener, S. Ozeren, Y. Kaneda

    IAG-IASPEI 2017　2017/07/30

  256. Accuracy of a continuous/on-demand GPS/Acoustic seafloor positioning using a slackly moored buoy in the Kuroshio region International-presentation

    Imano, M, M. Kido, Y. Ohta, N. Takahashi, T. Fukuda, H. Ochi, C. Honsho, R. Hino

    IAG-IASPEI 2017　2017/07/30

  257. How the real-time GNSS can contribute to near field tsunami early warning in association with other geophysical measurements International-presentation

    OHTA Yusaku

    2017 GNSS Tsunami Early Warning System Workshop in Sendai　2017/07/25

  258. Slip rate of the North Anatolian Fault at the western part of the Sea of Marmara through seafloor geodetic measurement for two years International-presentation

    Tomita, F, M. Kido, Y. Ohta, T. Iinuma, R. Hino

    IAG-IASPEI 2017　2017/07

  259. 海陸地殻変動観測の捉えた2011年東北地方太平洋沖地震の余効変動の時空間変化 International-presentation

    飯沼 卓史, 太田 雄策, 三浦 哲, 武藤 潤, 富田 史章, 木戸 元之, 日野 亮太

    JpGU-AGU Joint Meeting 2017　2017/05/25

  260. 自己浮上式海底圧力計による海底上下変動長期観測にむけて International-presentation

    日野亮太, 鈴木秀市, 佐藤真樹子, 太田雄策, 伊藤喜弘, 梶川宏明, 小畠時彦

    JpGU-AGU Joint Meeting 2017　2017/05/25

  261. Possibility of real-time volcanic plume monitoring using GNSS phase residual and SNR data International-presentation

    Ohta, Y, M. Iguchi

    JpGU-AGU Joint Meeting 2017　2017/05/23

  262. 海陸地殻変動観測の捉えた2011年東北地方太平洋沖地震の余効変動の時空間変化 International-presentation

    中尾 茂, 他, 数, 三浦 哲, 太田 雄策, 出町 知嗣

    JpGU-AGU Joint Meeting 2017　2017/05/22

  263. Reexamination of the fault model for transient slow slip event in the Japan Trench before the 2011 Tohoku-Oki earthquake International-presentation

    Nishimagi, Y, Ohta, Y, Hino, R, Ohzono, M

    JpGU-AGU Joint Meeting 2017　2017/05/22

  264. 東北地方におけるGNSS速度場のクラスタ解析 International-presentation

    伊藤嘉秋, 三浦 哲, 太田雄策

    JpGU-AGU Joint Meeting 2017　2017/05/20

  265. Estimation of the coseismic slip history deduced from the “GNSS carrier phase to fault slip” approach International-presentation

    Yusuke Tanaka, Yusaku Ohta, Shinichi Miyazaki

    JpGU-AGU Joint Meeting 2017　2017/05/20

  266. Accuracy of real-time GPS/Acoustic measurement using a slackly moored buoy International-presentation

    Imano, M, M. Kido, Y. Ohta, N. Takahashi, T. Fukuda, H. Ochi, C. Honsho, R. Hino

    JpGU-AGU Joint Meeting 2017　2017/05/20

  267. Near-field tsunami forecasting from offshore pressure data in association with the earthquake early warning International-presentation

    Horiuchi, A, R. Hino, Y. Ohta, H. Tsushima

    JpGU-AGU Joint Meeting 2017　2017/05/20

  268. Postseismic deformation associated with the 2011 Tohoku Earthquake deduced by means of GPS/Acoustic surveys International-presentation

    Tomita, F, M. Kido, Y. Ohta, T. Iinuma, R. Hino

    EGU General Assembly 2017　2017/04/23

  269. Estimating slip deficit of the North Anatolian Fault beneath the Sea of Marmara, Turkey, using on- and off-shore geodetic data International-presentation

    Yamamoto, R, M. Kido, Y. Ohta, N. Takahashi, Y. Yamamoto, D. Kalafat, A. Pinar, H. Ozener, S. Ozeren, Y. Kaneda

    2016 AGU Fall Meeting　2016/12/12

  270. Spatiotemporal variation in the postseismic deformation of the 2011 Tohoku-oki earthquake revealed by seafloor geodetic observations International-presentation

    Tomita, F, M. Kido, Y. Ohta, R. Hino, T. Iinuma

    2016 AGU Fall Meeting　2016/12/12

  271. Development of the triaxial precise movable table for the precision and accuracy assessment of the kinematic GNSS time series International-presentation

    Ohta, Y, M. Imano, M. Kido

    2016 AGU Fall Meeting　2016/12/12

  272. Development of the triaxial precise movable table for the precision and accuracy assessment of the kinematic GNSS time series International-presentation

    Imano, M, M. Kido, Y. Ohta, T. Fukuda, N. Takahashi, T. Fukuda, H. Ochi, C. Honsho, R. Hino

    2016 AGU Fall Meeting　2016/12/12

  273. 周波数領域でのひずみ解析による地震規模即時推 定に向けた解析手法の改良

    大久保慎人, 板場智史, 太田雄策

    日本測地学会 第126回講演会　2016/10/19

  274. キネマティックGNSS解析精度評価のための3軸精密可動台の開発

    太田雄策

    日本測地学会 第126回講演会　2016/10/19

  275. キネマティックPPP解析を用いた2016年熊本地震による動的歪み場の特徴

    太田雄策, 大園真子, 高橋浩晃, 日野亮太

    日本測地学会 第126回講演会　2016/10/19

  276. GEONETリアルタイム解析システムREGARDによ る平成28年熊本地震におけるリアルタイム断層推 定

    川元智司, 檜山洋平, 高松直史, 太田雄策, 西村卓也

    日本測地学会 第126回講演会　2016/10/19

  277. 海底測地観測によるマルマラ海・北アナトリア断層 でのすべり欠損量検出及びGNSSデータを併せた断 層モデル推定

    山本龍典, 木戸元之, 太田雄策, 高橋成実, 山本揚二朗, Dogan Kalafat, Ali Pinar, Haluk Ozener, Sinan Ozeren, 金田義行

    日本測地学会 第126回講演会　2016/10/19

  278. 3軸可動台を用いた海上移動体のキネマティック GNSS 測位精度評価(序報)

    今野美冴, 太田雄策, 木戸元之, 本荘千枝

    日本測地学会 第126回講演会　2016/10/19

  279. GPS/A観測によって捉えた2011年東北沖地震に伴う余効変動の時空間変化

    富田史章, 木戸元之, 太田雄策, 日野亮太, 飯沼卓史

    日本地震学会2016年秋季大会　2016/10/07

  280. 1Hz キネマティックGNSS解析にもとづく2016年熊本地震による動的ひずみ場の特徴

    太田雄策, 大園真子, 高橋浩晃, 日野亮太

    日本地震学会2016年秋季大会　2016/10/07

  281. tFISH/EEW: 沖合津波観測と緊急地震速報に基づく津波予測アルゴリズムの開発とその性能評価

    堀内明子, 日野亮太, 太田雄策, 加地正明, 越村俊一, 対馬弘晃

    日本地震学会2016年秋季大会　2016/10/05

  282. 3軸精密可動台を用いたキネマティック GNSS 測位精度評価

    今野美冴, 太田雄策, 木戸元之, 本荘千枝

    日本地震学会2016年秋季大会　2016/10/05

  283. 係留ブイを用いた GPS/A 海底地殻変動観測の精度評価と高度化

    今野美冴, 木戸元之, 太田雄策, 高橋成実, 福田達也, 越智寛, 本荘千枝, 日野亮太

    日本地震学会2016年秋季大会　2016/10/05

  284. 近地津波および遠地地震波による2012年東北沖スラブ内地震 (Mw 7.2) の破壊過程

    久保田 達矢, 日野 亮太, 太田 雄策, 鈴木 秀市, 稲津 大祐

    日本地震学会2016年秋季大会　2016/10/05

  285. Spatio-temporal foreshocks distribution of the 2011 Tohoku-Oki earthquake based on the OBS observation

    Debebe Kifle Atnafu, Ryota Hino, Yusaku Ohta, Ryosuka Azuma, Masanao Shinohara, Yoshihiro Ito

    日本地震学会2016年秋季大会　2016/10/05

  286. Foreshock activities before the 2011 Tohoku-Oki Earthquake

    Debebe Atnafu, R. Hino, R. Azuma, Y. Ohta, M. Shinohara, Y. Ito

    日本地球惑星科学連合2016年大会　2016/05/24

  287. Spatial characteristics of postseismic deformation following the 2011 Tohoku-oki earthquake inferred from repeated GPS/Acoustic observations

    Tomita, F, M. Kido, Y. Ohta, R. Hino, T. Iinuma, Y. Osada

    日本地球惑星科学連合2016年大会　2016/05/24

  288. 蔵王山・吾妻山周辺の火山性地殻変動

    三浦 哲, 太田雄策, 出町知嗣, 立花憲司, 山本 希, 市來雅啓

    日本地球惑星科学連合2016年大会　2016/05/23

  289. 係留ブイを用いた GPS/A 海底地殻変動観測の誤差伝播の評価

    今野美冴, 木戸元之, 太田雄策, 高橋成実, 福田達也, 越智 寛, 日野亮太

    日本地球惑星科学連合2016年大会　2016/05/23

  290. Detecting a relative motion across the Japan Trench using precise acoustic ranging

    R. Yamamoto, R. Hino, M. Kido, Y.Ohta, T. Kubota, F. Tomita, K.Ohta, Y. Osada

    日本地球惑星科学連合2016年大会　2016/05/22

  291. 2012年12月東北沖スラブ内ダブレット地震（Mw7.2）の断層モデルから考察した2011年東北沖地震後のスラブ内応力場

    久保田達矢, 日野亮太, 鈴木秀市, 太田雄策, 稲津大祐

    日本地球惑星科学連合2016年大会　2016/05/22

  292. 海底間音響測距を用いたトルコ・マルマラ海下北アナトリア断層のすべりレート検出及び断層モデルの推定

    山本 龍典, 木戸 元之, 太田 雄策, 高橋 成実, 山本 揚二朗, Dogan Kalafat, Ali Pinar, Sinan Ozeren, 金田 義行

    日本地球惑星科学連合2016年大会　2016/05/22

  293. 津波・陸上GNSS観測に基づくリアルタイム津波予測アルゴリズムtFISH/RAPiDの性能評価

    堀内 明子, 日野 亮太, 太田 雄策, 久保田 達矢, 対馬 弘晃

    日本地球惑星科学連合2016年大会　2016/05/22

  294. Fault model of the intraplate doublet on Dec. 7 2012 derived from near- and far-field tsunami records and its implication for the post-2011 stress state International-presentation

    T. Kubota, R. Hino, Y. Ohta, S. Suzuki, D. Inazu

    AGU 2015 Fall Meeting　2015/12/12

  295. Recent development status of the quasi real-time crustal deformation monitoring based on the onshore real-time GNSS data and offshore GNSS/Acoustic measurement in Japan International-presentation

    Otha Y, R Hino, M Kido, M Imano, S Kawamoto, Y Sato, T Fukuda, H Ochi, Y Ishihara, O Motohashi N Takahashi

    AGU 2015 Fall Meeting　2015/12/12

  296. 海底間音響測距によるトルコ・マルマラ海・北アナトリア断層のひずみ速度の検出

    山本龍典, 木戸元之, 太田雄策, 高橋成実, 山本揚二朗, Dogan Kalafat, Ali Pinar, Ozeren Sinan, 金田義行

    日本地震学会2015年度秋季大会　2015/10/26

  297. マルマラ海下の北アナトリア断層のひずみ速度検出に向けた海底測距システムの開発と設置

    木戸元之, 太田雄策, 山本龍典, 高橋成実, 山本揚二朗

    日本地震学会2015年度秋季大会　2015/10/26

  298. 2012年スラブ内ダブレット地震（Mw7.2, 7.2）の津波記録から推定した震源モデルの再検討

    久保田達矢, 日野亮太, 太田雄策, 鈴木秀市, 稲津大祐

    日本地震学会2015年度秋季大会　2015/10/26

  299. 人工地震探査で推定した2011年東北地方太平洋沖地震最大すべり域周辺の地殻構造

    東龍介, 太田雄策, 山田知朗, 伊藤喜宏, 佐藤利典, 日野亮太, 望月公廣, 村井芳夫, 八木原寛, 篠原雅尚

    日本地震学会2015年度秋季大会　2015/10/26

  300. GPS/A海底地殻変動観測による2011年東北沖地震の余効変動の解明

    富田史章, 木戸元之, 長田幸仁, 太田雄策, 日野亮太, 飯沼卓史

    日本地震学会2015年度秋季大会　2015/10/26

  301. 実観測記録を用いたtFISH による近地津波予測性能評価

    堀内 明子, 日野 亮太, 太田 雄策, 久保田 達矢, 対馬 弘晃

    日本地震学会2015年度秋季大会　2015/10/26

  302. トルコ・マルマラ海下の北アナトリア断層における海底間音響測距の精度評価

    木戸元之, 山本龍典, 太田雄策, 高橋成実

    日本測地学会第124回講演会　2015/10/14

  303. Crustal deformation associated with the unrest of Azumayama Volcano International-presentation

    Miura, S, M. Yamamoto, M. Ichiki, T. Nishimura, Y. Ohta, T. Demachi

    AOGS 2015　2015/08/07

  304. 係留ブイを用いたGPS/Aによる海底地殻変動自動観測の測位精度評価と精度向上へ向けた解析手法の開発

    今野 美冴, 木戸 元之, 太田 雄策, 高橋 成実, 福田 達也, 越智 寛, 日野 亮太

    日本地球惑星科学連合2015年大会　2015/05

  305. 2011年東北沖地震最大すべり域周辺での人工地震波構造調査（序報）

    東 龍介, 日野 亮太, 太田 雄策, 望月 公廣, 山田 知朗, 村井 芳夫, 伊藤 喜宏, 八木原 寛, 佐藤 利典, 篠原 雅尚

    日本地球惑星科学連合2015年大会　2015/05

  306. トルコ・マルマラ海における北アナトリア断層の海底測地モニタリング

    木戸 元之, 高橋 成実, 山本 揚二朗, Kalafat Dogan・Pinar Ali, Ozeren Sinan, 太田 雄策, 金田 義行

    日本地球惑星科学連合2015年大会　2015/05

  307. 吾妻山周辺の地殻変動

    三浦 哲, 山本 希, 市來 雅啓, 西村 太志, 太田 雄策, 出町 知嗣

    日本地球惑星科学連合2015年大会　2015/05

  308. アラスカ南東部で観測された絶対重力変化の再検討

    風間 卓仁, 福田 洋一, 佐藤 忠弘, 太田 雄策, 三浦 哲

    日本地球惑星科学連合2015年大会　2015/05

  309. GNSS視線遅延データにより捕捉された桜島火山における噴煙柱の移流拡散

    太田 雄策, 井口 正人

    日本地球惑星科学連合2015年大会　2015/05

  310. 近地海底圧力観測記録によって推定した2012 年12 月7 日三陸沖地震（Mw7.3）に伴う津波の波源

    久保田達矢, 日野亮太, 太田雄策, 鈴木秀市, 稲津大祐

    日本地球惑星科学連合2015年大会　2015/05

  311. キネマティックPPP解析における対流圏遅延パラメータと座標推定値の分離精度についての検証

    平田雄一朗, 太田雄策

    日本地球惑星科学連合2015年大会　2015/05

  312. tFISHを用いた近地津波予測の性能評価-2011年3月9日三陸沖の地震（M7.3）を事例に-

    堀内 明子, 太田 雄策, 久保田 達矢, 対馬 弘晃, 日野 亮太

    日本地球惑星科学連合2015年大会　2015/05

  313. GEONETリアルタイム解析システム（REGARD）による地震規模即時推定

    川元 智司, 宮川 康平, 佐藤 雄大, 西村 卓也, 太田 雄策, 日野 亮太, 三浦 哲, 等々力 賢

    日本地球惑星科学連合2015年大会　2015/05

  314. 精密可動台を用いた海底地殻変動観測のためのキネマティックGNSS時系列のノイズ評価

    太田 雄策, 木戸 元之, 出町 知嗣, 日野 亮太

    日本地球惑星科学連合2015年大会　2015/05

  315. 海底地殻変動観測によって捉えた2011年東北沖地震の余効変動

    富田 史章, 木戸 元之, 長田 幸仁, 日野 亮太, 太田 雄策, 飯沼 卓史, 東 龍介, 和田 育子, 三浦 哲

    日本地球惑星科学連合2015年大会　2015/05

  316. GEONETリアルタイム解析を用いた地震規模即時推定システム（REGARD）の概要

    佐藤 雄大, 宮川 康平, 川元 智司, 大島 健一, 村松 弘規, 犬飼 孝明, 太田 雄策, 出町 知嗣, 三浦 哲, 日野 亮太, 中村 康弘, 西山 眞衣, 道家 友紀

    日本地球惑星科学連合2015年大会　2015/05

  317. 地殻変動に起因する大気中ラドン濃度変動

    岩田 大地, 長濱 裕幸, 武藤 潤, 安岡 由美, 三浦 哲, 太田 雄策

    日本地球惑星科学連合2015年大会　2015/05

  318. オンデマンド地殻変動観測ブイシステムの開発と現状の課題

    高橋 成実, 石原 靖久, 福田 達也, 越智 寛, 田原 淳一郎, 森 尚仁, 出口 充康, 木戸 元之, 太田 雄策, 日野 亮太, 三吉 基之, 橋本 剛正, 本橋 修, 小平 秀一

    日本地球惑星科学連合2015年大会　2015/05

  319. Development of a geodetic monitoring system using seafloor extensometers for the state of the submerged North Anatolian Fault in the Sea of Marmara International-presentation

    Kido, M, N. Takahashi, Y. Yamamoto, D. Kalafat, A. Pinar, S. Ozeren, Y. Ohta, Y. Kaneda

    EGU General Assembly 2015　2015/04/12

  320. Revisiting the Interplate Coupling Beneath Northeast Japan Before the 2011 Tohoku Earthquake (M9.0) Based on Terrestrial and Seafloor Geodetic Observations International-presentation

    Iinuma, T, R. Hino, M. Kido, Y. Ohta, S. Miura

    AGU 2014 Fall Meeting　2014/12

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    その他

  321. Spatiotemporal Evolution of Postseismic Deformation Following the 2011 Tohoku Earthquake in Northeastern Japan Arc

    Miura, S, Y. Ohta, T. Demachi, K. Tachibana, T. Sato

    AGU 2014 Fall Meeting　2014/12

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    その他

  322. Recent development for near-field tsunami forecasting from real time GNSS and offshore tsunami data

    Ohta, Y, H. Tsushima, S. Kawamoto, K. Miyagawa, T. Yahagi, Y. Sato, R. Hino, T. Demachi, T. Iinuma, S. Miura

    AGU 2014 Fall Meeting　2014/12

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    本人

  323. 2011 年東北地方太平洋沖地震後の火山フロント沿いの余効ひずみ異常域

    三浦哲, 太田雄策

    日本火山学会2014年度秋季大会　2014/11

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    その他

  324. 津波監視および海底地殻変動観測用係留ブイにおけるGPSデータの精度評価

    太田雄策, 木戸元之, 日野亮太, 今野美冴, 高橋成実, 石原靖久, 福田達也, 越智寛, 田原淳一郎, 森 尚仁, 出口充康, 武藤勝彦, 橋本剛正, 本橋修

    日本測地学会第122回講演会　2014/11

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    本人

  325. 海陸地殻変動観測に基づく2011年東北地方太平洋沖地震の余効変動の解析

    飯沼卓史, 日野亮太, 木戸元之, 長田幸仁, Wang Kelin・Sun Tianhaozhe, 太田雄策, 三浦哲

    日本測地学会第122回講演会　2014/11

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    その他

  326. リアルタイムGNSSデータを用いたCMT解の推定手法の評価

    平田雄一朗, 太田雄策, 川元智司, 日野亮太

    日本測地学会第122回講演会　2014/11

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    本学学生

  327. 海底地殻変動観測による2011年東北沖地震後の太平洋プレートにおける高変位速度の検出

    富田史章, 長田幸仁, 太田雄策, 木戸元之, 飯沼卓史, 日野亮太

    日本測地学会第122回講演会　2014/11

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    本学学生

  328. 東北地方太平洋沖地震後の日本海溝沿いの海底地殻変動

    木戸元之, 日野亮太, 飯沼卓史, 東龍介, 和田育子, 今野美冴, 中山貴史, 三浦哲, 富田史章, 長田幸仁, 太田雄策, 藤本博己

    日本測地学会第122回講演会　2014/11

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    その他

  329. 係留ブイを用いたリアルタイム津波・海底地殻変動連続観測においてGPS/音響結合方式により得られたデータの精度評価

    今野美冴, 太田雄策, 木戸元之, 高橋成実, 福田達也, 越智寛

    日本測地学会第122回講演会　2014/11

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    本学学生

  330. PPP解析にもとづく噴煙柱モニタリングの試み–搬送波位相残差とSNRデータの比較－

    太田雄策, 井口正人

    日本測地学会第122回講演会　2014/11

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    本人

  331. 南西アラスカのGIAにおける圧縮性の効果

    田中愛幸, 佐藤忠弘, 太田雄策, 三浦哲, Jeffrey T. Freymueller・Volker Klemann

    日本測地学会第122回講演会　2014/11

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    その他

  332. 2011年東北地方太平洋沖地震後の奥羽脊梁山脈沿いの余効ひずみ異常域

    三浦 哲, 太田雄策, 飯沼卓史, 出町知嗣, 立花憲司, 佐藤俊也, 大園真子

    日本測地学会第122回講演会　2014/11

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    その他

  333. リアルタイム GPS 解析によって推定された震源断層解の不確実性にもとづいた津波浸水予測精度の評価

    久保田達矢, 日野亮太, 太田雄策, 越村俊一, 齊藤竜彦

    日本地震学会2014年度秋季大会　2014/11

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    本学学生

  334. 日本海溝沿いの東北沖地震後の余効変動検出に向けた海底地殻変動繰り返し観測

    木戸元之, 日野亮太, 飯沼卓史, 東龍介, 和田育子, 富田史章, 長田幸仁, 太田雄策, 今野美冴, 中山貴史, 三浦哲, 藤本博己

    日本地震学会2014年度秋季大会　2014/11

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    その他

  335. GPS 音響結合方式によって計測された東北沖地震後の太平洋プレートにおける高変位速度,

    富田史章, 長田幸仁, 太田雄策, 木戸元之, 日野亮太, 飯沼卓史

    日本地震学会2014年度秋季大会　2014/11

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    本学学生

  336. 東北地方太平洋沖地震後の奥羽脊梁山脈沿いの余効ひずみ異常域

    三浦哲, 太田雄策, 飯沼卓史, 出町知嗣, 立花憲司, 佐藤俊也, 大園真子

    日本地震学会2014年度秋季大会　2014/11

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    その他

  337. Modelling of the Postseismic Deformation Associated with the 2011 off the Pacific Coast of Tohoku Earthquake Based on Terrestrial and Seafloor Geodetic Observations International-presentation

    Iinuma, T, R. Hino, M. Kido, T. Sun, K. Wang, Y. Ohta, Y. Osada, H. Fujimoto, D. Inazu

    AOGS 2014　2014/07

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    その他

  338. The postseismic deformation of the 2011 Tohoku-oki Earthquake observed by repeated GPS/Acoustic surveys International-presentation

    Tomita, F, M. Kido, Y. Osada, H. Fujimoto, R. Hino, R. Azuma, T. Iinuma, Y. Ohta, I. Wada

    AOGS 2014　2014/07

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    本学学生

  339. Crustal Deformation in the Rupture Area of the 2011 Tohoku-oki Earthquake ― Preseismic, Coseismic, and Postseismic Deformation International-presentation

    Hino, R, Y. Osada, T. Iinuma, Y. Ito, Y. Ohta, M. Kido, S. Suzuki, D. Inazu, H. Fujimoto

    AOGS 2014　2014/07

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    その他

  340. Build-up of Comprehensive Observation Network Responding to the Unrest of Zao Volcano, Northeastern Japan

    Satoshi, M, T. Nishimura, M. Yamamoto, M. Ichiki, Y. Ohta, S. Hirahara, T. Demachi, T. Kaida, K. Tachibana, T. Hashimoto

    Symposium on Geodesy for Earthquake and Natural Hazards (GENAH 2014)　2014/07

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    その他

  341. Geodetic Characteristic of the Postseismic Deformation Following the Interplate Large Earthquake in and around the Sanriku-Oki Region, Japan

    Ohta, Y, R. Hino, K. Ariyoshi, D. Inazu, K. Tachibana, T. Demachi, S. Miura

    Symposium on Geodesy for Earthquake and Natural Hazards (GENAH 2014)　2014/07

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    本人

  342. tFISH/RAPiD: Rapid Improvement of Near-Field Tsunami Forecasting Based on Offshore Tsunami Data by Incorporating Onshore GNSS Data

    Tsushima, H, R. Hino, Y. Ohta, T. Iinuma, S. Miura

    Symposium on Geodesy for Earthquake and Natural Hazards (GENAH 2014)　2014/07

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    その他

  343. 高潮流域下におけるリアルタイム津波・地殻変動観測ブイシステムの海域試験

    高橋 成実, 石原 靖久, 福田 達也, 越智 寛, 田原 淳一郎, 森 尚仁, 木戸 元之, 太田 雄策, 日野 亮太, 武藤 勝彦, 橋本 剛正, 本橋 修, 金田 義行

    日本地球惑星科学連合2014年大会　2014/05

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    その他

  344. GEONETリアルタイム解析システム（REGARD）の全国対応

    矢萩 智裕, 宮川 康平, 川元 智司, 大島 健一, 山口 和典, 村松 弘規, 太田 雄策, 出町 知嗣, 三浦 哲, 日野 亮太, 齊田 優一, 道家 友紀

    日本地球惑星科学連合2014年大会　2014/05

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  345. 海底地殻変動観測による東北地方太平洋沖地震の余効変動検出

    富田史章, 木戸元之, 長田幸仁, 東龍介, 藤本博己, 日野亮太, 飯沼卓史, 太田雄策, 和田育子

    日本地球惑星科学連合2014年大会　2014/05

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    本学学生

  346. 受託研究「海底地殻変動観測の高度化」における東北大学の研究成果

    木戸元之, 藤本博己, 日野亮太, 太田雄策, 長田幸仁, 飯沼卓史, 東龍介, 和田育子, 鈴木秀市, 富田史章, 今野美冴

    日本地球惑星科学連合2014年大会　2014/05

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    その他

  347. 海陸地殻変動観測に基づく2011年東北地方太平洋沖地震の余効変動モデル

    飯沼卓史, 日野亮太, 木戸元之, Sun Tianhaozhe, Wang Kelin, 太田雄策, 長田幸仁, 藤本博己, 稲津大祐

    日本地球惑星科学連合2014年大会　2014/05

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    その他

  348. 海底地殻変動データ解析の高精度化・自動化に向けた測距信号走時読み取り手法の検討

    東龍介, 富田史章, 飯沼卓史, 木戸元之, 藤本博己, 藤本博己, 長田幸仁, 太田雄策, 和田育子

    日本地球惑星科学連合2014年大会　2014/05

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    その他

  349. リアルタイム津波・地殻変動観測ブイシステムを用いた海底地殻変動観測

    今野 美冴, 木戸 元之, 太田 雄策, 福田 達也, 越智 寛, 高橋 成実

    日本地球惑星科学連合2014年大会　2014/05

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    本学学生

  350. キネマティックPPP時系列解析によって得られた2011年東北地方太平洋沖地震の余効変動にともなう特徴的ひずみ分布

    平田 雄一朗, 太田 雄策, 大園 真子, 三浦 哲

    日本地球惑星科学連合2014年大会　2014/05

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    本学学生

  351. 水準測量より明らかにした東北地方太平洋沖地震による鳴子地域の上下地殻変動

    塚本 雄也, 杉山 賢一, 藤田 和果奈, 渡辺 慶太郎, 渡邉 虹水, 高畑 明拓, 松岡 萌, 後藤 章夫, 太田 雄策

    日本地球惑星科学連合2014年大会　2014/05

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    本学学生

  352. キネマティックPPPデータによる噴煙柱検出の試み

    太田 雄策, 井口 正人, 植木 貞人, 出町 知嗣

    日本地球惑星科学連合2014年大会　2014/05

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    本人

  353. 蔵王山の火山活動に伴う地殻変動

    三浦 哲, 西村 太志, 太田 雄策, 山本 希, 出町 知嗣, 立花 憲司, 近江 克也, 篠原 英一郎

    日本地球惑星科学連合2014年大会　2014/05

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    その他

  354. 準静的滑りの時空間変化に基づく地震発生切迫度評価の研究

    平成25年度「地震及び火山噴火予知のための観測研究計画」成果報告シンポジウム　2014/03/12

  355. Detecting temporal changes of seismic velocity in response to tidal strain: analysis of a small array data at Iwate volcano International-presentation

    Takano, T, T. Nishimura, H. Nakahara, Y. Ohta, S. Tanaka

    AGU 2013 Fall Meeting　2013/12/12

  356. Geodetic characteristic of the postseismic deformation following the interplate large earthquake along the Japan Trench International-presentation

    Ohta, Y, R. Hino, K. Ariyoshi, T. Matsuzawa, M. Mishina, T. Sato, D. Inazu, Y. Ito, K. Tachibana, T. Demachi, S. Miura

    AGU 2013 Fall Meeting　2013/12/11

  357. Postseismic deformation associated with the 2011 Tohoku Earthquake (M9.0) based on terrestrial and seafloor geodetic observations International-presentation

    Iinuma, T, R. Hino, T. Sun, M. Kido, Y. Osada, K. Wang, Y. Ohta, S. Sato, D. Inazu, H. Fujimoto, Y. Ito, S. Suzuki

    AGU 2013 Fall Meeting　2013/12/09

  358. Precision evaluation for intensive GPS acoustic measurements along Japan trench International-presentation

    Kido, M, H. Fujimoto, Y. Osada, Y. Ohta, K. Tadokoro, T. Watanabe, S. Nagai, K. Yasuda, T. Okuda, J. Yamamoto

    AGU 2013 Fall Meeting　2013/12/09

  359. Reprocessed records of seafloor vertical motion prior to the 2011 Tohoku earthquake International-presentation

    Hino, R, D. Inazu, Y. Ohta, Y. Ito, S. Suzuki, T. Iinuma, Y. Osada, M. Kido, H. Fujimoto, Y. Kaneda

    AGU 2013 Fall Meeting　2013/12/09

  360. An accuracy assessment of realtime GNSS time series toward semi- real time seafloor geodetic observation International-presentation

    Osada, Y, Y. Ohta, T. Demachi, M. Kido, H. Fujimoto, R. Azuma, R. Hino

    AGU 2013 Fall Meeting　2013/12/09

  361. Crustal deformation detected by GPS observation network across the Sumatran fault system in northwestern Sumatra, Indonesia International-presentation

    Tabei, T, T. Ito, F. Kimata, Y. Ohta, E. Gunawan, N. Ismail, D. Sugiyanto, I. Nurdin

    AGU 2013 Fall Meeting　2013/12/09

  362. Analysis of afterslip and viscoelastic relaxation following the 2004 Sumatra-Andaman earthquake from GPS observations in northern Sumatra International-presentation

    Gunawan, E, T. Sagiya, T. Ito, F. Kimata, T. Tabei, Y. Ohta, I. Meilano, H. Z. Abidin, A. Agustan, I. Nurdin, D. Sugiyanto

    AGU 2013 Fall Meeting　2013/12/09

  363. Development of a new real-time GNSS data analysis system in GEONET for rapid Mw estimates in Japan International-presentation

    Kawamoto, S, K. Miyagawa, T. Yahagi, K. Yamaguchi, H. Tsuji, T. Nishimura, Y. Ohta, R. Hino, S. Miura

    AGU 2013 Fall Meeting　2013/12/09

  364. Ocean bottom pressure records of the 2011 Tohoku-Oki earthquake International-presentation

    Hino, R, D. Inazu, Y. Ito, Y. Ohta, T. Iinuma

    11th SEGJ International Symposium　2013/11/18

  365. 日本海溝における海底GPS集中観測の速報

    木戸元之, 日野亮太, 飯沼卓史, 東龍介, 和田育子, 藤本博己, 長田幸仁, 太田雄策, 鈴木秀市, 中山貴史, 出町知嗣, 富田史章

    日本測地学会第120回講演会　2013/10/30

  366. 江刺地球潮汐観測施設で観測された東北地方太平洋沖地震前後でのひずみ速度変化

    田村良明, 三浦哲, 太田雄策, 出町知嗣, 河野俊夫, 佐藤忠弘, 坪川恒也

    日本測地学会第120回講演会　2013/10/29

  367. 2013年5月24日オホーツク海巨大深発地震(Mw8.3)による地殻変動

    高橋浩晃, 大園真子, 太田雄策

    日本測地学会第120回講演会　2013/10/29

  368. GPS観測による蔵王山周辺の地殻変動

    三浦哲, 太田雄策, 出町知嗣, 立花憲司, 近江克也, 篠原英一郎

    日本測地学会第120回講演会　2013/10/29

  369. 海底圧力観測における2011年東北地方太平洋沖地震の余効変動

    日野亮太, 飯沼卓史, 木戸元之, 長田幸仁, 藤本博己, 稲津大祐, 伊藤喜宏, 太田雄策, 鈴木秀市

    日本測地学会第120回講演会　2013/10/29

  370. 海底地殻変動観測による太平洋プレートの沈み込み速度検出の試み

    富田史章, 太田雄策, 木戸元之, 長田幸仁, 藤本博己, 日野亮太, 飯沼卓史, 東龍介

    日本測地学会第120回講演会　2013/10/29

  371. リアルタイムGPS解析結果可視化ツールの開発（序報）

    出町知嗣, 太田雄策, 三浦哲, 立花憲司, 佐藤俊也

    日本測地学会第120回講演会　2013/10/29

  372. 海陸測地観測データに基づく2011年東北地方太平洋沖地震の余効すべりの時空間発展（その３）

    飯沼卓史, 日野亮太, 木戸元之, 長田幸仁, 藤本博己, 太田雄策, 伊藤喜宏, 鈴木秀市, 佐藤まりこ, 稲津大祐

    日本地震学会2013年度秋季大会　2013/10/08

  373. 日本海溝沿いのH25年度海底GPS集中観測の概要

    木戸元之, 日野亮太, 飯沼卓史, 東 龍介, 和田育子, 藤本博己, 長田幸仁, 太田雄策, 鈴木秀市, 中山貴史, 出町知嗣, 富田史章, 平原 聡, 海田俊輝, 立花憲司, 三浦 哲, 松澤 暢

    日本地震学会2013年度秋季大会　2013/10/07

  374. Investigation on the postseismic deformation associated with the 2011 Tohoku Earthquake basd on terrestrial and seafloor geodetic observations - to evaluate the further seismic hazard potential on tha plate interface beneath the northeastern Japanese Isla International-presentation

    Iinuma, T, R. Hino, M. Kido, Y. Osada, D. Inazu, Y. Ito, S. Suzuki, Y. Ohta, H. Fujimoto

    IAG Scientific Assembly 2013　2013/09/04

  375. Real-time crustal deformation monitoring based on RTK-GPS: Application to 2011 Tohoku earthquake and its improvement for implementation to actual GPS network International-presentation

    Ohta, Y, S. Miura, R. Hino, T. Kobayashi, H. Tsushima, S. Kawamoto, K. Miyagawa, T. Yahagi, K. Yamaguchi, H. Tsuji, T. Nishimura

    IAG Scientific Assembly 2013　2013/09/01

  376. Seafloor geodetic monitoring in the hypocentral area of the 2011 Great Tohoku Earthquake International-presentation

    Hino, R, M. Kido, Y. Osada, T. Iinuma, Y. Ito, Y. Ohta, H. Fujimoto, Y. Kaneda

    Joint Assembly IAHS-IAPSO-IASPEI　2013/07/21

  377. 新しいGEONETリアルタイム解析システムの開発

    川元智司, 宮川康平, 山口和典, 西村卓也, 宮原伐折羅, 古屋智秋, 酒井和紀, 畑中雄樹, 根本悟, 辻宏道, 太田雄策, 日野亮太, 木戸元之, 飯沼卓史, 藤本博己, 三浦哲

    日本地球惑星科学連合2013年大会　2013/05/24

  378. 近地津波波形解析による2011年東北地方太平洋沖地震前震の震源断層モデル推定

    久保田達矢, 日野亮太, 飯沼卓史, 伊藤喜宏, 太田雄策, 鈴木秀市, 稲津大祐, 齊藤竜彦, 金田義行

    日本地球惑星科学連合2013年大会　2013/05/23

  379. 日本海溝沿いの海底地殻変動観測点の強化と観測の開始について

    木戸元之, 長田幸仁, 山本淳平, 藤本博己, 太田雄策, 中山貴史, 海田俊輝, 田所敬一, 渡部豪, 永井悟, 奥田 隆, 安田 健二

    日本地球惑星科学連合2013年大会　2013/05/23

  380. セミリアルタイム海底地殻変動観測に向けたGNSS測位精度評価

    山本淳平, 長田幸仁, 太田雄策, 平原聡, 出町知嗣, 佐藤俊也, 木戸元之, 藤本博己, 内田雅之

    日本地球惑星科学連合2013年大会　2013/05/23

  381. 高潮流域下で観測可能な新しい津波・地殻変動観測ブイシステムの開発

    高橋成実, 石原靖久, 越智寛, 福田達也, 田原淳一郎, 前田洋作, 杉山智彦, 木戸元之, 太田雄策, 武藤勝彦, 橋本剛正, 小暮聡, 金田義行

    日本地球惑星科学連合2013年大会　2013/05/23

  382. PS-InSAR時系列解析による2008年岩手・宮城内陸地震後の粘弾性緩和と局所的余効変動の検出

    大下佑也, 太田雄策, 大園真子, 岡田知己, 出町知嗣, 立花憲司, 三浦哲, 海野徳仁

    日本地球惑星科学連合2013年大会　2013/05/21

  383. 2011年東北地方太平洋沖地震前後の海底上下変動

    日野亮太, 稲津大祐, 飯沼卓史, 太田雄策, 伊藤喜宏, 長田幸仁, 木戸元之, 藤本博己, 金田義行

    日本地球惑星科学連合2013年大会　2013/05/21

  384. 稠密GPSデータによる山形盆地断層帯周辺および東北地方中央部における2011年東北地方太平洋沖地震前後の地殻変動場

    福田秀樹, 太田雄策, 島田誠一, 長谷見晶子, 立花憲司, 出町知嗣, 三浦哲, 加藤照之

    日本地球惑星科学連合2013年大会　2013/05/21

  385. MR(Mixed Reality)を用いた沈み込むプレート形状とその活動の3次元表示

    海田俊輝, 出町知嗣, 平原聡, 飯沼卓史, 太田雄策, 内田直希, 中島淳一, 日野亮太, 海野徳仁, 長谷川昭

    日本地球惑星科学連合2013年大会　2013/05/20

  386. 海底GPS手法による海底地殻変動観測高度化に向けた新たな取り組み

    藤本博己, 木戸元之, 太田雄策, 山本淳平, 長田幸仁, 飯沼卓史, 日野亮太, 田所敬一, 金田義行

    日本地球惑星科学連合2013年大会　2013/05/19

  387. Geodetic constraints on afterslip characteristics following the March 9, 2011, foreshock of the 2011 Tohoku earthquake International-presentation

    2013 Taiwan-Japan Joint Workshop on Crustal Deformation　2013/04/23

  388. Characteristic of the postseismic deformation following the 2011 Sanriku-Oki earthquake (Mw 7.2) by comparing the 1989 and 1992 Sanriku-Oki events International-presentation

    Ohta, Y, R. Hino, K. Ariyoshi, T. Matsuzawa, M. Mishina, T. Sato, K. Tachibana, T. Demachi, S. Miura

    EGU General Assembly 2013　2013/04/09

  389. Postseismic slip distribution associated with the 2011 Tohoku Earthquake (M9.0) based on terrestrial and seafloor geodetic data International-presentation

    Iinuma, T, R. Hino, M. Kido, D. Inazu, Y. Osada, M. Sato, Y. Ohta, H. Fujimoto, Y. Ito, S. Suzuki

    AGU 2012 Fall Meeting　2012/12/03

  390. Seafloor crustal movement observed off Miyagi after the 2011 Tohoku Earthquake using GPS-Acoustic observation system International-presentation

    Osada, Y, M. Kido, Y. Ito, Y. Ohta, R. Hino, H. Fujimoto

    AGU 2012 Fall Meeting　2012/12/03

  391. Development of GPS/A Seafloor Geodetic Network Along Japan Trench and Onset of Its Operation

    Kido, M, H. Fujimoto, Y. Osada, Y. Ohta, J. Yamamoto, K. Tadokoro, T. Okuda, T. Watanabe, S. Nagai, K. Yasuda

    AGU 2012 Fall meeting　2012/12/03

  392. Source models of M-7 class earthquakes in the rupture area of the 2011 Tohoku-Oki Earthquake by near-field tsunami modeling International-presentation

    Kubota, T, R. Hino, D. Inazu, T. Saito, T. Iinuma, S. Suzuki, Y. Ito, Y. Ohta, K. Suzuki

    AGU 2012 Fall Meeting　2012/12/03

  393. Accuracy of acoustic positioning of seafloor benchmarks by a generic acoustic transducer pair International-presentation

    Suzuki, S, Y. Ito, M. Kido, Y. Ohta, Y. Osada, R. Hino, H. Fujimoto

    AGU 2012 Fall Meeting　2012/12/03

  394. Absolute gravity measurements in Southeast Alaska and continuous gravity observation in Juneau by ISEA2 project International-presentation

    Sato, T, T. Kazama, S. Miura, Y. Ohta, S. Okubo, H. Fujimoto, M. Kaufman, S. J Herreid, C. F Larsen, J. T Freymueller

    AGU 2012 Fall Meeting　2012/12/03

  395. Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake International-presentation

    Ito, Y, R. Hino, M. Kido, H. Fujimoto, Y. Osada, D. Inazu, Y. Ohta, T. Iinuma, M. Ohzono, M. Mishina, S. Miura, K. Suzuki, T. Tsuji, J. Ashi

    AGU 2012 Fall Meeting　2012/12/03

  396. PS-InSARおよびGPS時系列にもとづく2008年岩手・宮城内陸地震後の長期的非定常地殻変動

    大下祐也, 太田雄策, 海野徳仁, 三浦哲

    日本測地学会第118回講演会　2012/11/02

  397. 塩野原基線の再測量

    鷺谷威, 松多信尚, 太田雄策, A. Meneses, 野村晋一, 鈴木翔太

    日本測地学会第118回講演会　2012/11/01

  398. 新しいGEONETリアルタイム解析の現状と課題

    川元智司, 宮川康平, 山口和典, 西村卓也, 宮原伐折羅, 古屋智秋, 酒井和紀, 畑中雄樹, 根本悟, 辻宏道, 太田雄策, 日野亮太, 木戸元之, 飯沼卓史, 藤本博己, 三浦哲

    日本測地学会第118回講演会　2012/11/01

  399. 音響トランスポンダを用いた音響測距による海底ベンチマークの位置決定精度について

    鈴木秀市, 伊藤喜宏, 太田雄策, 日野亮太, 木戸元之, 長田幸仁, 藤本博己

    日本測地学会第118回講演会　2012/10/31

  400. 絶対重力計FG5および超伝導重力計iGravを用いたアラスカ南東部における重力観測

    風間卓仁, 佐藤忠弘, 太田雄策, 三浦哲, M. Kaufman, S. Herreid, J. Freymueller

    日本測地学会第118回講演会　2012/10/31

  401. 宮城県沖における2011年東北地方太平洋沖地震の余効変動

    長田幸仁, 木戸元之, 飯沼卓史, 藤本博己, 伊藤喜宏, 太田雄策, 鈴木秀市, 日野亮太, 稲津大祐

    日本測地学会第118回講演会　2012/10/31

  402. 宮城県沖における海底圧力観測

    日野亮太, 久保田達矢, 伊藤喜宏, 太田雄策, 鈴木秀市

    日本測地学会第118回講演会　2012/10/31

  403. PS-InSAR時系列解析による2008年岩手・宮城内陸地震後の長期的非定常地殻変動

    大下佑也, 太田雄策, 海野徳仁, 三浦哲

    日本地震学会2012年秋季大会　2012/10/18

  404. 宮城沖における2011年東北地方太平洋沖地震の余効変動

    長田幸仁, 木戸元之, 飯沼卓史, 藤本博己, 伊藤喜宏, 太田雄策, 鈴木秀市, 日野亮太, 稲津大祐

    日本地震学会2012年秋季大会　2012/10/17

  405. ひずみ集中帯と2011年東北地方太平洋沖地震(M9.0)時の地殻変動異常を再現する東北日本下のレオロジーモデル

    矢部康男, 大園真子, 太田雄策, 飯沼卓史, 武藤潤

    日本地震学会2012年秋季大会　2012/10/17

  406. 海陸測地観測データに基づく2011年東北地方太平洋沖地震の余効すべりの時空間発展（その２）

    飯沼卓史, 木戸元之, 長田幸仁, 藤本博己, 日野亮太, 太田雄策, 伊藤喜宏, 鈴木秀市, 佐藤まりこ, 稲津大祐

    日本地震学会2012年秋季大会　2012/10/16

  407. ＧＰＳデータ解析の高度化とそれに基づく地震発生過程に関する研究

    日本地震学会2012年秋季大会　2012/10

  408. 2011年3月9日三陸沖の地震（Ｍｗ 7.2）の余効変動の特徴-1989年, 1992年三陸沖(岩手県沖)の地震の余効変動との比較-

    太田雄策, 日野亮太, 三品正明, 佐藤忠弘, 立花憲司, 出町知嗣, 田村良明, 三浦 哲

    日本地震学会2012年秋季大会　2012/10

  409. 東北地方太平洋沖地震域で2011年7月10日に発生したスラブ内地震(Mw7.0)に伴う津波とその波源

    久保田達矢, 日野亮太, 稲津大祐, 斎藤竜彦, 飯沼卓史, 鈴木秀市, 太田雄策, 伊藤喜宏, 鈴木健介

    日本地震学会2012年秋季大会　2012/10

  410. Co- and Post- seismic slip associated with the 2011 off the Pacific Coast of Tohoku Earthquake based on terrestrial and seafloor geodetic observations International-presentation

    Iinuma, T, R. Hino, M. Kido, Y. Osada, Y. Ohta, H. Fujimoto

    2012 Global COE Final Symposium: Achievements of G-COE Program for Earth and Planetary Dynamics and the Future Perspective　2012/09/25

  411. Co- and Post- seismic slip associated with the 2011 off the Pacific Coast of Tohoku Earthquake based on terrestrial and seafloor geodetic observations International-presentation

    Iinuma, T, R. Hino, M. Kido, Y. Osada, Y. Ohta, H. Fujimoto

    8th APRU Research Symposium　2012/09/20

  412. Strain Anomalies of The Inland Crust of NE Japan Induced by The 2011 Off The Pacific Coast of Tohoku Earthquake (Mw9.0), Japan International-presentation

    Y. Yabe, M. Ohzono, Y. Ohta, T. Iinuma, J. Muto

    AOGS - AGU (WPGM) Joint Assembly 2012　2012/08/13

  413. Quasi real-time fault model estimation for near-field tsunami forecasting based on real-time GPS analysis International-presentation

    Ohta, Y, T. Kobayashi, H. Tsushima, R. Hino, S. Miura, T. Iinuma, H. Fujimoto

    Tsunami Workshop by Sentinel Asia　2012/07/03

  414. GNSSデータによる震源断層即時推定と その津波規模予測への応用

    地震及び火山噴火研究の将来構想シンポジウム　2012/07

  415. 海陸地殻変動データに基づく2011年東北地方太平洋沖地震に伴う余効すべりの時空間発展

    飯沼 卓史, 日野 亮太, 木戸 元之, 稲津 大祐, 長田 幸仁, 佐藤 まりこ, 石川 直史, 太田 雄策, 伊藤 喜宏, 鈴木 秀市, 藤本 博己

    日本地球惑星科学連合2012年大会　2012/05/24

  416. PS-InSAR時系列解析から求めた2008年岩手・宮城内陸地震後の地殻変動

    大下 佑也, 太田 雄策, 三浦 哲, 出町 知嗣, 立花 憲司, 海野 徳仁

    日本地球惑星科学連合2012年大会　2012/05/23

  417. 霧島火山における2011年１月の噴火以降のGPS連続観測による地殻変動

    中尾 茂, 森田 裕一, 後藤 和彦, 八木原 寛, 平野 舟一郎, 及川 純, 上田 英樹, 小園 誠史, 平田 安廣, 高橋 浩晃, 一柳 昌義, 太田 雄策, 松島 健, 井口 正人

    日本地球惑星科学連合2012年大会　2012/05/23

  418. GPS音響結合方式観測による2011年東北沖地震の余効変動

    長田 幸仁, 木戸 元之, 飯沼 卓史, 稲津 大祐, 佐藤 まりこ, 太田 雄策, 伊藤 喜宏, 日野 亮太, 藤本 博己

    日本地球惑星科学連合2012年大会　2012/05/23

  419. 全国ひずみ傾斜データの流通一元化と公開

    高橋 浩晃, 山口 照寛, 中尾 茂, 松島 健, 加納 靖之, 山崎 健一, 寺石 眞弘, 伊藤 武男, 鷺谷 威, 大久保 慎人, 浅井 康広, 原田 昌武, 本多 亮, 加藤 照之, 三浦 哲, 横田 崇, 勝間田 明男, 小林 昭夫, 吉田 康宏, 木村 一洋, 太田 雄策, 田村 良明, 柴田 智郎

    日本地球惑星科学連合2012年大会　2012/05/21

  420. 2011年東北地方太平洋沖地震に伴う東北日本の地殻不均質に起因するひずみ異常分布

    大園 真子, 矢部 康男, 飯沼 卓史, 太田 雄策, 三浦 哲, 立花 憲司, 佐藤 俊也, 出町 知嗣

    日本地球惑星科学連合2012年大会　2012/05/21

  421. 地震時永久変位即時推定手法の開発およびその2011年東北地方太平洋沖地震への適用

    小林 竜也, 太田 雄策, 日野 亮太, 三浦 哲, 藤本 博己, 対馬 弘晃, 出町 知嗣, 立花 憲司

    日本地球惑星科学連合2012年大会　2012/05/21

  422. GPS観測網(AGNeSS)によるスマトラ断層の断層固着の空間変化

    伊藤 武男, Endra Gunawan, 木股 文昭, 田部井 隆雄, 太田 雄策, Meilano Irwan, Agstan, Nurdin Irwandi

    日本地球惑星科学連合2012年大会　2012/05/20

  423. 2011年東北地方太平洋沖地震発生前のスロースリップイベント

    伊藤 喜宏, 日野 亮太, 木戸 元之, 藤本 博己, 長田 幸仁, 稲津 大祐, 三浦 哲, 太田 雄策, 内田 直希, 辻 健, 芦 寿一郎, 三品 正明

    日本地球惑星科学連合2012年大会　2012/05/20

  424. Continuous GPS observations in Tohoku University and recovery effort after the 2011 off the Pacific coast of Tohoku Earthquake International-presentation

    Demachi, T, S. Miura, Y. Ohta, K. Tachibana, S. Ueki, T. Sato, M. Ohzono, N. Umino

    European Geosciences Union General Assembly 2012　2012/04

  425. Co- and postseismic slip distribution for the 2011 March 9 earthquake based on the geodetic data: Role on the initiation of the 2011 Tohoku earthquake International-presentation

    Yusaku Ohta, Daisuke Inazu, Mako Ohzono, Ryota Hino, Masaaki Mishina, Junichi Nakajima, Yoshihiro Ito, Takeshi Iinuma, Tadahiro Sato, Yoshiaki Tamura, Hiromi Fujimoto, Kenji Tachibana, Tomotsugu Demachi, Yukihito Osada, Masanao Shinohara, Satoshi Miura

    European Geosciences Union General Assembly 2012　2012/04

  426. Newly developed an algorithm to detect/estimate static ground displacements for near-field tsunami forecasting based on the RTK-GPS data International-presentation

    Ohta, Y, T. Kobayashi, H. Tsushima, S. Miura, R. Hino, T. Iinuma, H. Fujimoto

    SSA Annual Meeting 2012　2012/04

  427. Co- and post-seismic deformation of the M7.3 foreshock triggering the 2011 M9.0 Tohoku Earthquake International-presentation

    Ohta, Y, D. Inazu, M. Ohzono, R. Hino, M. Mishina, J. Nakajima, Y. Ito, T. Iinuma, T. Sato, H. Fujimoto, K. Tachibana, T. Demachi, Y. Osada, M. Shinohara, S. Miura

    AGU Fall Meeting 2011　2011/12

  428. Coseismic Slip Distribution of the 2011 off the Pacific Coast of Tohoku Earthquake Deduced from Land and Seafloor Geodesy International-presentation

    Iinuma, T, M. Kido, Y. Osada, D. Inazu, M. Ohzono, H. Tsushima, R. Hino, Y. Ohta, S. Suzuki, H. Fujimoto, S. Miura, M. Shinohara

    AGU 2011 Fall Meeting　2011/12

  429. Co- and post-seismic deformation of the M7.3 foreshock triggering the 2011 M9.0 Tohoku Earthquake International-presentation

    Ohta, Y, D. Inazu, M. Ohzono, R. Hino, M. Mishina, J. Nakajima, Y. Ito, T. Iinuma, T. Sato, H. Fujimoto, K. Tachibana, T. Demachi, Y. Osada, M. Shinohara, S. Miura

    AGU Fall Meeting 2011　2011/12

  430. Post-seismic deformation observed off Miyagi after the 2011 0ff the Pacific coast of Tohoku Earthquake (M 9.0) using GPS-Acoustic observation system International-presentation

    Osada, Y, M. Kido, Y. Ito, Y. Ohta, R. Hino, H. Fujimoto

    AGU Fall Meeting 2011　2011/12

  431. Strain anomaly of the inland crust of NE Japan induced by the 2011 off the Pacific coast of Tohoku Earthquake (Mw9.0), Japan International-presentation

    Yabe, Y, M. Ohzono, T. Iinuma, Y. Ohta, T. Demachi, K. Tachibana, S. Miura

    AGU 2011 Fall Meeting　2011/12

  432. Ocean bottom pressure observations near the source of the 2011 Tohoku earthquake International-presentation

    Inazu, D, R. Hino, S. Suzuki, Y. Osada, Y. Ohta, T. Iinuma, H. Tsushima, Y. Ito, M. Kido, H. Fujimoto

    AGU Fall Meeting 2011　2011/12

  433. Rapid fault model estimation based on RTK-GPS and its application to near-field tsunami forecasting International-presentation

    AGU 2011 Fall Meeting　2011/12

  434. Foreshocks and Mainshock of the 2011 Tohoku Earthquake Observed by Ocean Bottom Seismic/Geodetic Monitoring International-presentation

    Hino, R, Y. Ito, K. Suzuki, S. Suzuki, D. Inazu, T. Iinuma, Y. Ohta, H. Fujimoto, M. Shinohara, Y. Kaneda

    AGU Fall Meeting 2011　2011/12

  435. 複合測地観測によるM7.3 (3月9日) 地震時・地震後地殻変動

    太田雄策, 稲津大祐, 大園真子, 日野亮太, 三品正明, 中島淳一, 伊藤喜宏, 飯沼卓史, 佐藤忠弘, 田村良明, 藤本博己, 立花憲司, 出町知嗣, 長田幸仁, 篠原雅尚, 三浦哲

    日本地震学会2011年秋季大会　2011/10

  436. 岩手火山における短期傾斜・ひずみ変動－2009年10月から2010年6月－

    植木貞人, 平原 聡, 中山貴史, 出町知嗣, 河野俊夫, 立花憲司, 太田雄策, 趙 大鵬

    日本火山学会2011年度秋季大会　2011/10

  437. 2011年東北地方太平洋沖地震の震源近傍での海底圧力観測

    稲津大祐, 日野亮太, 鈴木秀市, 長田幸仁, 太田雄策, 飯沼卓史, 対馬弘晃, 伊藤嘉宏, 木戸元之, 藤本博己

    日本地震学会2011年秋季大会　2011/10

  438. 2011年東北地方太平洋沖地震の震源近傍での海底圧力観測

    稲津大祐, 日野亮太, 鈴木秀市, 長田幸仁, 太田雄策, 飯沼卓史, 対馬弘晃, 伊藤嘉宏, 木戸元之, 藤本博己

    日本測地学会第116回講演会　2011/10

  439. 東北地方太平洋沖地震と誘発地震～ 4 月7 日のスラブ内地震（M7.1）について～

    中島淳一, 長谷川昭, 北佐枝子, 太田雄策, 大園真子, 三浦哲

    日本地震学会2011年秋季大会　2011/10

  440. RTK-GPSデータによる震源断層モデル即時決定 -近地津波予測の高精度化に向けて-

    小林竜也, 太田雄策, 三浦哲, 対馬弘晃, 日野亮太, 高須知二, 藤本博己

    日本地震学会2011年秋季大会　2011/10

  441. 海底圧力観測で捉えられた2011年東北地方太平洋沖地震とその前震による地殻変動

    日野亮太, 稲津大祐, 伊藤喜宏, 飯沼卓史, 太田雄策, 鈴木秀市, 長田幸仁, 木戸元之, 藤本博己, 篠原雅尚, 金田義行

    日本地震学会2011年秋期大会　2011/10

  442. 海陸測地観測データに基づく2011年東北地方太平洋沖地震の地震時すべり分布

    飯沼卓史, 木戸元之, 長田幸仁, 稲津大祐, 日野亮太, 太田雄策, 鈴木秀市, 藤本博己, 大園真子, 対馬弘晃, 三浦哲, 篠原雅尚

    日本地震学会2011年秋季大会　2011/10

  443. 海陸測地観測データに基づく2011年東北地方太平洋沖地震の地震時すべり分布の推定

    日本測地学会第116回講演会　2011/10

  444. 長基線リアルタイムキネマティックGPS解析の連続実地試験とその精度評価

    太田雄策, 小林竜也, 出町知嗣, 立花憲司, 佐藤俊也, 藤本博己, 三浦哲

    日本測地学会第116回講演会　2011/10

  445. Rapid determination of seimsic fault model using RTK-GPS data International-presentation

    Kobayashi, T, Y. Ohta, S. Miura

    IUGG 2011 General Assembly　2011/06

  446. InSARデータにより検出された2008年岩手・宮城内陸地震後の長期的余効滑り

    太田雄策, 小澤拓, 大園真子, 三浦哲

    日本地球惑星科学連合2011年大会　2011/05

  447. 高サンプリングGPS観測・解析技術の高度化と火山観測への応用

    「地震及び火山噴火予知のための観測研究計画」平成22年度成果報告シンポジウム　2011/03

  448. 水準測量による2008 年岩手・宮城内陸地震後の上下地殻変動場(序報)

    太田雄策, 大園真子, 赤塚正樹, 小林竜也, 出町知嗣, 三浦哲, 立花憲司, 鈴木秀市, 小澤和浩, 鷺谷威, 山本淳平, 若杉貴浩, 村瀬雅之, 西村卓也, 小林知勝

    日本測地学会第114回講演会　2010/11

  449. Can we detect the aseismic slip at plate boundary based on the RTK-GPS? International-presentation

    G-COE Symposium 2010 Dynamic Earth and Heterogeneous Structure　2010/07/13

  450. 「ゆっくり地震：普通の地震と何が違う？」

    鹿児島大学理学部インテンシブ理数教育特別プログラム　2010/06/22

  451. 中・長基線RTK-GPS時系列の長期安定性とそのノイズ特性評価

    日本地球惑星科学連合2010年大会　2010/05

  452. 低価格2周波GPS受信機とデータロガーを用いたGPS観測システムの構築

    日本地球惑星科学連合2010年大会　2010/05

  453. RTK-GPSによるリアルタイム地殻変動監視（序報）

    地殻変動研究集会　2010/03/10

  454. 高サンプリングGPS観測・解析技術の高度化と火山観測への応用

    地震及び火山噴火予知のための観測研究計画」成果報告シンポジウム　2010/03/03

  455. Coseismic and postseismic deformation of the 2008 Iwate-Miyagi Nairiku earthquake deduced from geodetic data International-presentation

    G-COE symposium 2010: Earthquakes, Active Tectonics and Geodynamics of Island Arcs　2010/02/19

  456. AmbizapによるPPP測位解高精度化とその精度評価

    日本地球惑星科学連合2009年大会　2009/05

  457. Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake and its implication International-presentation

    GCOE International Symposium Circum-Pacific Subduction Zones　2009/02

  458. Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced from a dense GPS network International-presentation

    AGU 2008 Fall meeting　2008/12

  459. Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced from a dense GPS network International-presentation

    ASC-SSJ合同学会　2008/11

  460. 稠密GPS観測網に基づく2008年岩手・宮城内陸地震の地震時断層モデル

    日本測地学会第110回講演会　2008/10

  461. キネマティックGPS による火山体監視の可能性と問題点

    平成20年度京都大学防災研究所研究集会(20K09)「火山噴火機構の解明とモデル化－高度な噴火予知を目指して－」　2008/09

  462. キネマティックGPS解析に基づく海洋潮汐加重変形検出の安定性評価

    日本地球惑星科学連合2008年大会　2008/05

  463. Seismic and Tsunami wave detection of the 2004 Sumatra Andaman earthquake by high-rate kinematic GPS analysis International-presentation

    International Symposium on the restoration program from giant earthquakes and tsunamis　2008/01

  464. The time constant variations of slow slip events in the south Alaska subduction zone International-presentation

    AGU 2007 Fall Meeting　2007/12

  465. 宮尾佳世, 三浦 哲, 長谷川 昭, 中尾 茂, Laura Wallace

    日本測地学会第108回講演会　2007/11

  466. 稠密GPS連続観測に基づく2007年新潟県中越沖地震の余効変動

    三浦哲, 立花憲司, 飯沼卓史, 松島健, 高橋浩晃, 宮崎真一, 鷺谷威, 伊藤武男, 道家涼介, 竹内章, 宮尾佳世, 平尾暁彦, 前田宜浩, 山口照寛, 高田真秀, 岩國真紀子, 落唯史, イルワンメイラノ

    日本地震学会2007年秋季大会　2007/10

  467. 南アラスカで発生する時定数の異なるスロースリップイベント

    Jefferey T. Freymueller, 三浦哲

    日本地震学会2007年秋季大会　2007/10

  468. Application of real-time GPS for earthquake disaster mitigation in Japan International-presentation

    Real-Time GPS for scientific requirements　2007/10

  469. 東北大からの次期計画にむけた提案その３ 観測の高度化のための新規技術開発について

    次期地震予知研究計画検討シンポジウム　2007/06

  470. PPPキネマティックGPSの長期安定性とノイズ特性評価

    日本地球惑星科学連合2007年大会　2007/05

  471. Postseismic deformation following the 2004 Sumatra-Andaman earthquake in the northern Sumatra region International-presentation

    International workshop in Banda Aceh, Indonesia　2006/11

  472. 北部スマトラ域における2004年スマトラ・アンダマン地震後の余効変動のモデル化 -余効滑りの発生場所と滑り方向の考察-

    日本地震学会2006年秋季大会　2006/10

  473. GEONETデータを用いたキネマティックPPPによる雑音特性の評価

    日本測地学会2006年秋季大会　2006/10

  474. GPS地震計の能力とその雑音特性

    測地・地殻変動に関する研究集会　2006/09

  475. 長距離基線 Kinematic GPS解析によるスマトラ-アンダマン地震に伴う表面波の検出

    mm、μarcsec、ｎGalで拓く測地・地球物理」研究会（第２回）　2006/02

  476. A postseismic deformation following 2004 Sumatra-Andaman earthquake based on continuous GPS data in northern Sumatra region International-presentation

    AGU Faill Meeting 2005　2005/12

  477. GPS 連続観測データに基づく2004年スマトラ-アンダマン地震に伴うスマトラ島北部における余効変動のモデル化

    日本地震学会2005年秋期大会　2005/10

  478. A large postseismic deformation following 2004 Sumatra-Andaman earthquake, based on continuous GPS measurement in Banda Aceh, Indonesia ( A Preliminary report) International-presentation

    nternational Meeting, The Sumatran Earthquake Challenge　2005/08

  479. Directivity of large seismic wave caused by 2004 Sumatra earthquake based on the high-frequency GPS data International-presentation

    EGU General Assembly 2005　2005/04

  480. Examination of interplate coupling in the southern Alaska subduction zone, based on the GPS data International-presentation

    AGU Faill Meeting 2004　2004/12

  481. GPSデータに基づく南アラスカにおけるスロースリップイベントとその時間発展の検討

    日本地震学会2004年秋期大会　2004/10

  482. Reexamination of Interplate coupling model in the Tokai region, based on the GPS data

    AGU Faill Meeting 2003　2003/12

  483. GPSデータから求めた東海地域におけるプレート間カップリングの再検討

    日本地震学会2003年秋期大会　2003/10

  484. Time Dependent Model of The Slow Slip Event in the Tokai Region, South central Japan,Detected by GPS measurements in 2001 International-presentation

    IUGG 2003　2003/06

  485. GPS観測から推定した2001年東海スロースリップイベントの時間依存モデル

    2003年地球科学関連合同大会　2003/05

  486. Time Dependent Model of the Slow Slip Evvent in the Tokai Region,South Central Japan,Detected by GPS Measurement in 2001 International-presentation

    EGS-AGU-EUG Joint Assembly　2003/04

  487. Three dimensional velocity field of Eastern Shikoku,Southwest Japan Determined From GPS Data International-presentation

    The State of GPS Vertical Positioning Precision: Separation of Earth Processes by Space Geodesy Workshop　2003/04

  488. Propagation of the slow slip event in the Tokai Region, Detected by GPS Measurements International-presentation

    Mini International Workshop, "Slow Slip Events and Large Earthquake Occurrence Process at the Plate Subduction Zones"　2003/01

  489. 東海地域のプレート間カップリングとその時間的揺らぎの再検討

    日本地震学会2002年秋期大会　2002/10

  490. GPSデータから決定した四国東部の三次元速度場

    2002年地球科学関連合同大会　2002/05

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Industrial Property Rights 4

  1. ＲＥＧＡＲＤ

    商願第6281542号

    Property Type:

    Holder:

  2. 津波浸水予測システム、制御装置、並列計算機システムの制御方法及びプログラム

    OHTA Yusaku

    特許6362178

    Property Type: Patent

  3. 津波浸水予測システム、データ処理サーバ、津波浸水予測の依頼方法及びプログラム

    越村俊一, 小林広明, 日野亮太, 太田雄策, 撫佐昭裕, 佐藤佳彦, 村嶋陽一, 鈴木崇之, 井上拓也, 村田泰洋, 加地正明

    特許6323880

    Property Type: Patent

  4. 津波浸水予測システム、制御装置、津波浸水予測の提供方法及びプログラム

    越村俊一, 小林広明, 日野亮太, 太田雄策, 撫佐昭裕, 佐藤佳彦, 村嶋陽一, 鈴木崇之, 井上拓也, 村田泰洋, 加地正明

    特許6161130

    Property Type: Patent

Research Projects 33

  1. Investigation of water vapor variation during extreme precipitation events using ultra-dense GNSS observation networks

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Japan Agency for Marine-Earth Science and Technology

    2025/04 - 2030/03

  2. Continuous geohazard monitoring based on ultra high density onshore and offshore geodetic observation

    Yusaku Ohta

    Offer Organization: Japan Science and Technology Agency

    System: FOREST (Fusion Oriented REsearch for disruptive Science and Technology) program

    Institution: Tohoku University

    2021/04 - 2028/03

  3. 台風細密観測を実現するマルチジオハザード対応型小型浮体式波浪計の開発

    志村 智也, 馬場 康之, 藤田 実季子, 太田 雄策, 今井 優樹, 田村 仁, 森 信人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 挑戦的研究(開拓)

    Institution: 京都大学

    2024/06/28 - 2027/03/31

  4. Waveglider-based GNSS-acoustic survey utilized oceanographic model

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2024/04/01 - 2027/03/31

  5. Postseismic model for predicting crustal deformation and seismicity after the 7Tohoku-oki earthquake

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2023/04/01 - 2027/03/31

  6. Innovative ultra-high resolution real-time water vapor observation reveals the precursor and development process of cumuliform clouds

    Ryuichi Ichikawa, Yusaku Ohta, Kentaro Araki, Takuya Tajiri, Mikiko Fujita, Hideki Ujihara

    2023/04 - 2027/03

  7. Realization of an understanding of the hydrographic structures through collaboration between seafloor geodesy and physical oceanography

    Shinya Koketsu, Fumiaki Tomita

    Offer Organization: WPI-AIMEC

    System: WPI-AIMEC Fusion Science Award

    2024/07 - 2026/06

  8. Development of an Innovative Mobile Water Pressure Observation System -Realization of Interseismic Seafloor Vertical Crustal Deformation Monitoring

    Yusaku Ohta, Hiroaki Kajikawa

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2022/04 - 2026/03

  9. 理・工・医学の連携による災害医療デジタルツインの開発と医療レジリエンスの再構築

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tohoku University

    2021/07 - 2026/03

  10. (b) Establishment of a monitoring system for slip distribution along the plate interface

    Yusaku Ohta, Masanao Shinohara, Takeshi Iinuma

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology (MEXT)

    System: Research Project for Disaster Prevention on the great Earthquakes along the Nankai trough by MEXT

    2020/07 - 2025/03

  11. Research on efficient selection and evaluation of MEMS sensors with outstanding characteristics

    Ryoichi Nishimura, Yusaku Ohta

    Offer Organization: Tohoku University

    System: Tohoku University-NICT Matching Research Support Project

    Institution: Tohoku University and NICT

    2023/04 - 2024/05

  12. 2023年5月5日の地震を含む能登半島北東部陸海域で継続する地震と災害の総合調査

    平松 良浩, 岡田 知己, 吉田 圭佑, 高木 涼太, 篠原 雅尚, 酒井 慎一, 藏下 英司, 西村 卓也, 太田 雄策, 木下 陽平, 宮崎 真一, 後藤 忠徳, 笠谷 貴史, 吉村 令慧, 田中 愛幸, 宮澤 理稔, 荒木 英一郎, 森下 知晃, 鹿児島 渉悟, 石山 達也, 立石 良, 安江 健一, 廣内 大助, 松多 信尚, 宍倉 正展, 岩田 知孝, 浅野 公之, 大堀 道広, 村田 晶, 石川 浩一郎, 山岸 邦彰, 須田 達, 山崎 新太郎, 青木 賢人, 林 紀代美, 武田 公子, 田中 純一, 井口 克郎, 佐々木 大輔, 原 裕太, 吉田 浩

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究促進費

    Institution: 金沢大学

    2023/06 - 2024/03

  13. 能登半島北東部において継続する地震活動に関する総合調査

    平松 良浩, 藏下 英司, 酒井 慎一, 飯高 隆, 勝間田 明男, 岡田 知己, 吉田 圭佑, 西村 卓也, 太田 雄策, 木下 陽平, 吉村 令慧, 後藤 忠徳, 笠谷 貴史, 田中 愛幸, 宮澤 理稔, 森下 知晃, 鹿児島 渉悟, 石山 達也, 安江 健一, 廣内 大助, 松多 信尚, 大堀 道広, 村田 晶, 岩田 知孝

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究促進費

    Category: 特別研究促進費

    Institution: 金沢大学

    2022/07/22 - 2023/03/31

    More details Close

    能登半島北東部で長期間継続する地震活動の原因及び全体像、また2022年6月19日のマグニチュード5.4、最大震度６弱の地震による災害像を明らかにするために、地震観測、測地観測、電磁気観測、重力観測、温泉成分測定、活構造調査、強震観測からなる総合調査を2022年7月から2023年3月まで実施した。 これらの観測で得られたデータの解析により、複数の断層面で地震が発生していることや震源が時空間的に移動していること、震源域南部の深部に流体の存在を示す地震波速度構造や比抵抗構造が存在すること、地震波の反射波から推定される反射面も深部の流体の存在と整合的であること、地殻変動源の位置が時間的に変化するとともに地殻変動源のモデルが開口割れ目から開口を伴う逆断層に変化したこと、震源域北部において重力値が減少し、地殻変動源のモデルと概ね一致すること、温泉成分の陰イオン濃度が複数地点で同時期に時間変化をし、地殻流体の影響を反映した可能性が考えられること、年代指標となる火山灰に基づき海成段丘面の年代を特定し、その分布高度と合わせて隆起速度を推定したこと、地震活動域の東部から南部にかけての海成段丘面で新たな変動地形を見出したこと、震度６弱の記録地点周辺において、工学的基盤面での速度コントラストの大きさが地震動増幅に大きく寄与していることや卓越周波数の空間変化があること、を研究成果として得ることができた。 これらの成果は非火山地域における群発地震活動の要因を考える上で重要なものであり、また当該地域における地震防災に役立つ知見も得られており、科学的・社会的にも意義がある成果である。

  14. 津波情報の即時伝達のための水中音響伝送手法の開発

    高橋 成実, 木戸 元之, 今井 健太郎, 越智 寛, 石原 靖久, 太田 雄策, 福田 達也, 近貞 直孝

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 国立研究開発法人防災科学技術研究所

    2020/04 - 2023/03

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    2011年の東日本大震災では、高さ40mを超える津波が襲来し、甚大な被害が発生した。これを受け、日本海溝沿いには日本海溝海底地震津波観測網が敷設され、海底での津波観測と海域での水圧値を用いた津波予測技術が進展し（Tsushima et al., 2012; Takahashi et al., 2018）、いくつかのシステムは気象庁や自治体に実装された。しかし、海底観測網の整備と運用にはコストや人的負担が大きいため、全海域に敷設するのは難しい。遠地地震の監視を目的として、DARTブイシステム（https://nctr.pmel.noaa.gov/Dart/）が太平洋沿岸には設置、運用されているが、これも日本列島南方に流れる黒潮下では、その強潮流により設置することができず、全ての海域に設置できるものではない。これを解決するために、海底で観測した水圧値を音響信号に変換し、複数の中継器を経由して海面に伝送、衛星を通じて陸上にデータを伝送するシステムを検討している。 これを実現するために必要な技術は、海中部のノイズや海面や海底からの反射ノイズに強いこと、消費電力が抑えられて長期的な利用が可能であること、観測データの精度が確保できることである。これを検討するために、一定の数値を音響信号に変換して伝送する音響通信試験を6日間にわたり田沢湖で実施した。通信試験では、湖底に送信機を設置し、２つの一定値を使用して、音響データを直接湖面の受波機に伝送するケースと、中継器でデータを中継してから受波機に伝送するケースの2つの経路で伝送されたデータを比較し、音響伝送の安定性評価を行った。

  15. Development of novel ground-based microwave radiometer for earth science

    ICHIKAWA Ryuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: National Institute of Information and Communications Technology

    2018/04/01 - 2022/03/31

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    We have developed a wideband receiver system to apply a next-generation microwave radiometer to millimeter-wave spectroscopy for the high-resolution and high-precision monitoring of water vapor behavior. The new radiometer is suitable for not only space geodetic techniques such as very long-line baseline interferometry (VLBI) and GNSS, but also field measurements such as monitoring volcanic activities and cumulonimbus cloud generation. We have succeeded in developing a prototype of the complete receiver system, which has a wide-bandwidth feed of 16-62 GHz for measuring three frequency bands, namely, 16-32 GHz (water vapor), 28-38 GHz (liquid water), and 51-62 GHz (oxygen), although we were forced to change our schedule owing to the COVID-19 pandemic. We have also developed low-cost multi-GNSS receivers and a simulation tool to estimate tropospheric wet delays using a numerical weather model in order to evaluate the values obtained using the new radiometer.

  16. Fusion of sensing and simulation of tsunami damage assessment towards innovation of disaster medical system

    KOSHIMURA Shunichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tohoku University

    2017/05/31 - 2022/03/31

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    The project promoted collaborative research among science, engineering, and disaster medicine with the goal of enhancing resilience of disaster medical systems by integrating real-time simulation and sensing. Considering the catastrophic tsunami disaster concerned as future risks in Japan, we achieved three outcomes ; 1) quantitative and rapid estimation of human and physical damage caused by the tsunami, 2) immediate estimation of medical demands in disaster affected areas, and 3) methodology for planning and updating disaster medical activities through multi-agent simulation. Through the project, we examined the required specifications for an innovative medical support system in the anticipated disaster process of future Nankai Trough earthquake and tsunami disaster that is expected to occur next 30 years.

  17. New development of crustal deformation research deduced from hyper-dense GNSS Competitive

    Offer Organization: ERI, the University of Tokyo

    2020/04 - 2022/03

  18. 確度を考慮した全地球衛星測位システムによる地震・津波規模の即時推定法の開発 Competitive

    Offer Organization: Today Science Foundation

    System: Today Science and Technology Grant

    Institution: Tohoku University

    2018/04 - 2022/03

  19. Fusion of sensing and simulation towards enhancing disaster medical system

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2017/04/01 - 2021/03/31

  20. 革新的水圧変動モニタリングシステムの利活用先開拓のためのフィジビリティスタディ Competitive

    2020/06 - 2021/03

  21. 海底水圧連続観測に基づく2011年東北沖地震震源域のスロースリップイベント活動

    太田 雄策

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 新学術領域研究(研究領域提案型)

    Category: 新学術領域研究(研究領域提案型)

    Institution: 東北大学

    2017/04/01 - 2019/03/31

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    平成30年度は、長期ドリフト特性がどのようなパラメータで規定されているかを明らかにするために印加圧力および温度に依存したドリフト特性の変化について室内実験で検証を行った。さらに、海底水圧計の長期ドリフトがゼロ点(圧力の印加がない状態での出力) でのドリフト実測値より把握する手法（A-0-A方式, Kajikawa et al., 2014）の性能評価のための室内実験を実施した。 海底水圧計の長期ドリフト特性の温度変化依存性を把握するために、産業技術総合研究所計量標準総合センターの恒温槽内 (海底を想定し、2度に温度を設定) に水圧計を設置し、その状態で重錘形圧力天びんによって印加することで、海底環境下でのドリフト特性の把握を目指した。恒温槽に海底水圧系を設置してからの日数が短いために、温度に依存したドリフト特性変化の定量化には至っていないものの、室温状態と比較して明瞭にドリフトの振幅に差異が確認され、実際の温度環境で実験を行うことの重要性が明らかになった。 A-0-A方式による長期ドリフト把握能力の精度評価を目的とし、実験室環境でそれらの評価を行った。実験では70MPaと40MPaの２系統でそれぞれ2本ずつ印加し、高圧での印加後に短時間 (20分) センサーを大気圧に解放した。こうして得られたゼロ点での校正値と高圧印加時の時系列を比較し，A-0-A方式によるドリフト軽減の効果を検証した。その結果、両センサーとも印加時とゼロ点時のドリフト特性は大局的には一致することが明らかになった。一方、印加時とゼロ点時のドリフト特性の残差時系列には線形で説明できるトレンドが確認された。この結果は、A-0-A方式で完全にはドリフト成分が除去できない一方で，残差時系列は概ね単純な一次式で近似することが可能であり、それらの特性を事前に把握することで、ドリフトを正確に除去できる可能性がある。

  22. Resolution of crustal deformation of the Japan Islands in various spatio-temporal scales

    Sagiya Takeshi, Sueoka Shigeru, Miyakawa Ayumu, Yoshida Takeyoshi, Ichihara Mie, Aizawa Koki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Institution: Nagoya University

    2014/07/10 - 2019/03/31

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    We investigate crustal deformation in the Japan Islands combining geodetic, seismological, and geological approaches in order to understand the deformation processes in various spatio-temporal scales in a comprehensive manner. We find that long-lasting inelastic deformation is going on almost universally associated with active faults, playing an essential role in generation of inland earthquakes and geomorphic features. For a long time, geological and geodetic observations have been considered contradictory each other. But we have proven that these data can be integrated for better understanding of the whole deformation process of the Japan Islands.

  23. Development of novel ocean bottom pressure measurement system for understanding of the broadband crustal deformation Competitive

    Yusaku Ohta, Hiroaki Kajikawa

    Offer Organization: Tohoku University and AIST

    Institution: Tohoku University

    2018/04 - 2019/03

  24. Development of rapid coseismic fault model estimation system based on the multiple geodetic data

    Ohta Yusaku

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2015/04/01 - 2018/03/31

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    We developed the prototype system of rapid coseismic fault model estimation for the large earthquake whose magnitude is more than 7 based on real-time GNSS and strain meter. We showed the method for the high precision kinematic GNSS analysis and investigated the precision of kinematic GNSS time series using developed precise movable table for GNSS antenna. We also investigated the uncertainties estimation of the rapid coseismic fault model estimation using GNSS data based on MCMC approach. Furthermore, we improved the method for rapid coseismic fault model estimation based on borehole strain meter. Finally, we have started operation the prototype system of the distribution and its analysis of crustal deformation continuous observation data.

  25. Development of the high accuracy attitude determination system for the GNSS/Acoustic seafloor geodetic observation

    Ohta Yusaku

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2015/04/01 - 2017/03/31

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    For the accuracy and precision improvement of the geodetic observation in the offshore region, low power consumption system for the position and attitude estimation is extremely important. This research achieved (1) development of the low power consumption GNSS continuous observation system for the moored buoy environment and (2) development of new algorithm for the precise and accurate estimation deduced from the 1 GNSS antenna and MEMS gyro. We succeeded to develop the low power consumption GNSS observation system which contain the real-time PPP processing and the GNSS phase data recording with less than 3 W power consumption. We also developed the new algorithm for the attitude determination based on the 1 GNSS antenna and MEMS gyro. Based on our algorithm, we succeeded to estimate the attitude with the accuracy of 0.5, 0.4, and 0.4 degree for the Yaw, Pitch and Roll angle, respectively.

  26. Sumatran Fault after the giant Sumatra earthquake - Temporal decay of postseismic deformation and initiation of a new strain accumulation process

    TABEI Takao, KIMATA Fumiaki, ITO Takeo, OHTA Yusaku, TSUTSUMI Hiroyuki, ISMAIL Nazli, NURDIN Irwandi, SUGIYANTO Didik, MEILANO Irwan, GUNAWAN Endra

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Kochi University

    2012/04/01 - 2016/03/31

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    We have conducted continuous and intermittent GPS observations in Aceh province, northern Sumatra, Indonesia to monitor temporal decay of the postseismic deformation after the 2004 giant Sumatra earthquake. In addition we have carried out geodetic and geomorphic studies to evaluate earthquake generation potential of the Sumatran fault that is the arc-parallel strike-slip fault system in the overriding plate. GPS observations, interferometric analysis of synthetic aperture radar images, mapping of active faults from satellite stereo images, geomorphic field research, fault creep measurements, and trench excavation have been conducted to estimate slip pattern of the Sumatran fault in a wide range of time scale.

  27. Study on viscoelastic structure and monitoring of global change by observation of uplifting and gravity in Alaska, US

    Miura Satoshi, SATO TADAHIRO, FUJIMOTO HIROMI, OHTA YUSAKU, MOTOYUKI SATO, TAKAHASHI HIROAKI, OKUBO SHUHEI, KAZAMA TAKAHITO, Jeff Freymueller, Chris Larsen, Max Kaufman

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    2011/04/01 - 2016/03/31

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    In order to study crustal uplifting and gravity change in southeastern Alaska, United States, we carried out continuous GPS and gravity measurements together with absolute gravity survey three times in the area. From the continuous GPS measurements, the maximum uplifting rate of 3 cm/year, which is consistent with the previous study, was derived. Since the continuous gravity measurements by a superconducting gravimeter demonstrated very small, almost no instrumental drift rate, we may be able to use the gravimeter complementing the absolute gravity survey. Gravity change rates obtained by the survey show -1 to -3 micro-gal/year, which is about a half of those for the period from 2006 to 2008. This discrepancy can be attributed to the effects of underground water and/or loading of precipitation.

  28. Noise assessment of the real-time kinematic multi-GNSS time series Competitive

    Yusaku Ohta

    2014/07 - 2015/03

  29. A study on stress sensitivity of seismic velocity at shallow media using the earth tide and seismic wave interferometry

    NISHIMURA Takeshi, TANAKA Sachiko, OHTA Yusaku, NAKAHARA Hisashi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2012/04/01 - 2014/03/31

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    We used the tidal effect acting on the solid earth by the moon to examine the strain sensitivity of seismic velocity at shallow structure. We retrieved seismic waves propagating between two sites by cross-correlating the ambient noises for the dilatational and contractional episodes of the earth tide, respectively. Travel time differences of the seismic waves for the two episodes are measured for the ambient noises recorded at a small seismic array deployed on the foot of Mt. Iwate and Hi-net data. The results show that the seismic velocity at the dilatational episode is slightly lower than that at the contractional one. The strain sensitivity is estimated to be about 2-7x10^4 /strain.

  30. Research of rheological structure beneath the Ou-backbone Range based on the multiple geodetic data

    OHTA Yusaku

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2010/04 - 2014/03

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    We investigated the postseismic crustal deformation following the 2008 Iwate-Miyagi inland earthquake based on the precise leveling, dense GPS observation, and InSAR data. We investigated the rheological structure in the northeastern Japan arc based on the dense GPS network of far field from the focal region. In contrast, the near field of the focal region of the 2008 event, it is difficult to explain the some of the short-wave length crustal deformation. These anomalies will reflect the long-term aseismic slip in the shallower portion around the coseismic fault. Furthermore, we evaluated an anomalous crustal strain distribution in the Tohoku region associate with a step-like stress change induced by the 2011 Tohoku earthquake (Mw9.0). These strain anomalies may reflect the inhomogeneity of the rheology or stiffness of the crust.

  31. Development of broadband GPS seismometer

    OHTA Yusaku

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (Start-up)

    Category: Grant-in-Aid for Young Scientists (Start-up)

    Institution: Tohoku University

    2007 - 2008

  32. Study on viscoelastic structure beneath Southeastern Alaska, United States through geodetic observation of crustal uplift Caused by deglaciation

    MIURA Satoshi, SATO Tadahiro, FUJIMOTO Hiromi, OHTA Yusaku, KASAHARA Minoru, TAKAHASHI Hiroaki, SON Bunka, SUGANO Takayuki, OKUNO Junichi, INAZU Daisuke

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2005 - 2008

  33. プレート沈み込み帯におけるプレート間の力学的相互作用の時間変化の解明

    太田 雄策

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 名古屋大学

    2006 - 2007

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    平成18年度においては主にキネマティックGPS測位技術を地震計として利用するための精度検証についての評価を行った.GPSを地震計として用いる場合(以下GPS地震計),その利点は機械的な帯域制限が存在しない点にある.そのため短周期地震動から永久変位成分までを統一的に扱うことのできるセンサーとしてGPS地震計は有用であると考えられる.しかしGPS地震計の詳細な精度評価を行った研究は非常に少ない.更に従来用いられてきたある基準局に対する変動を求める基線解析ではなく,単独の観測点の変動を精密に求める精密単独測位法(PPP法)によるキネマティック解析に関する料度評価はほとんどなされていなかった.こうした観点から,PPPキネマティック座標時系列の精度評価を行った.その結果,座標時系列の安定性にはGPS衛星の時計補正情報が大きく影響を与えることが明らかになった.PPP法においては高精度に決定されたGPS衛星の軌道情報と時計補正情報が必須である.こうした時計補正情報に関しては複数の解析センターが地上GPS観測点のデータに基づいてその解析値(プロダクト)を提供している.特にAIUB/CODEとJPLは通常他の機関が提供するよりも高サンプリング(30秒毎)のプロダクトを提供している.今回はそれらを用いて,各プロダクト間の精度の差異を調べた.その結果,AIUB/CODEが提供する高サンプリングプロダクトを用いた場合が座標時系列の安定性が最も良い事が明らかになった.対照的にJPLの高サンプリングプロダクトでは短周期ノイズが卓越し,時計補正情報プロダクトに何らかのノイズが混入している可能性が明らかになった.また,座標時系列の長期安定性に関しても同時に評価を行った.その結果,座標値の絶対値がある特定の日を境に大きく偏差を持つ場合があることが明らかになった.

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Social Activities 22

  1. JICA training: ‘National Survey Project Planning and Management’ Lecturer

    2024/11/05 - 2024/11/05

  2. Public lectures on the science and experience of ‘measurement’.

    2024/11/02 - 2024/11/02

  3. 地殻変動の高精度把握

    地震・火山研究の最前線に迫る

    2024/02/18 - 2024/02/18

  4. JICA研修 「国家測量事業計画・管理」講師

    2023/10/23 - 2023/10/23

  5. JICA研修 「国家測量事業計画・管理」講師

    2022/11/07 - 2022/11/07

  6. 法政大学法政中学校における出前講義

    地震と津波の科学

    2022/03/16 - 2022/03/16

  7. JICA lecture in Tohoku University

    2019/09/24 - 2019/09/24

  8. 高等学校外体験型模擬授業 (水沢第一高等学校)

    2019/03/05 - 2019/03/05

  9. 出前授業(岩手県洋野町立中野中学校)

    2016/11/29 - 2017/11/29

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    「地震・津波とは？ 〜正しく理解する〜」と題した全校生向け出前授業を実施した．

  10. JICA研修の一環における講義

    2017/09/26 -

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    JICA研修「国家測量事業計画・管理コース」の一環として測地学・津波に関する講義を実施した．

  11. JICA研修の一環における講義

    2016/09/27 -

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    JICA研修「国家測量事業計画・管理コース」の一環として測地学・津波に関する講義を実施した．

  12. 津波観測で被害最小化

    2015/03/16 -

  13. ＧＰＳ活用、巨大地震を観測 地理院、春から本格運用

    2014/12/31 -

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    巨大地震が起きた際、ＧＰＳ衛星の電波で位置を正確に計測する全国の電子基準点の動き方を集約し、地震の震源や規模をすばやく特定する技術を国土地理院や東北大が開発、２０１５年度から本格的に運用を始めることがわかった。地理院は気象庁など、ほかの機関へのデータ公開も検討中だ。 規模が大きく、気象庁の地震計ではすぐにとらえられなかった東日本大震災級の巨大地震にも対応できるという。地震の規模や震源の迅速な特定は津波予測にも生かせる。 地理院によると、電子基準点は、地球の上空を回っているＧＰＳ衛星からの電波を受信して、１秒ごとに地球上の位置を測定している。正確な位置情報は、地図づくりや測量の基準として使われている。

  14. 巨大地震規模 3分で推定 東北大と地理院 試験開始

    2014/05/01 -

  15. 巨大地震規模、3分で推定＝国土地理院が新システム試験―津波警報に活用期待

    2014/04/30 -

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    巨大地震が発生した際、地震の規模（マグニチュード＝M）を3分程度で自動推定する新システムを国土地理院が全国を対象に整備し、来年度以降の本格運用に向け試験を始めた。東北大地震・噴火予知研究観測センターの太田雄策准教授らとの共同研究で、全地球測位システム（GPS）などを使う各地の電子基準点の変動（GEONETデータ）を素早く解析し、地震の断層モデルを想定して規模を推定する技術を開発した。 気象庁気象研究所と活用法を検討しており、同院の宮川康平地震調査官は「津波警報などに活用してもらえるよう、信頼度や精度を確保していきたい」と話している。技術的な詳細は横浜市で開催中の日本地球惑星科学連合大会で5月1日に報告される。

  16. ＧＰＳで地殻変動を検知 東北大と地理院共同研究

    2012/09/14 -

  17. 地震規模、ＧＰＳで即時に推計 国土地理院が試験導入へ

    2012/03/13 -

  18. M8超 素早く割り出せ

    2011/10/24 -

  19. Ｍ８超地震 即時に規模推定 東北大など手法開発 津波も再現

    2011/10/15 -

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    東北大や気象庁気象研究所（茨城県つくば市）などの研究グループは、衛星利用測位システム（ＧＰＳ）を使って、マグニチュード（Ｍ）８を超える海溝型巨大地震の際、断層の変位量と津波の規模を即時に推定するシステムを開発した。静岡市内で開催中の日本地震学会秋季大会（１５日まで）で１４日、発表した。 研究段階にあるこのシステムが実用化できれば、東海、東南海、南海の３連動地震で想定されている大津波からの迅速な避難にも役立ちそうだ。 研究グループによると、東日本大震災で得られたＧＰＳデータをこのシステムに入力し、解析したところ、地震発生から４・５分で断層の変位量を確定させ、地震の規模をＭ８・７とはじき出した。気象庁が地震発生当初に出したＭ８・１よりも実際の値（Ｍ９）に近かった。津波についても地震発生から５・５分で、北海道や東北地方への到達時間と第１波の高さをほぼ再現できた。 地震時の断層の変位量はこれまで

  20. マグニチュード ＧＰＳで迅速計算

    2011/06/14 -

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    巨大地震の発生直後にマグニチュードを割り出すのは難しいのが現状ですが、ＧＰＳで捉えた地盤の動きから数分程度でマグニチュードを推計する手法を東北大学の研究グループがまとめました。将来、津波の正確な予測にも活用できる可能性があるということです。

  21. 海溝型地震規模を即時推定＝ＧＰＳ利用、津波高さ予想も－東北大

    2011/06/13 -

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    東日本大震災のような大津波を伴う海溝型地震が発生した際、全地球測位システム（ＧＰＳ）を使って地震の規模を直ちに推定する東北大の太田雄策助教らの研究が１３日、地震予知連絡会（事務局・国土地理院）に報告された。副会長の松沢暢東北大教授や委員の斉藤隆国土地理院地理地殻活動研究センター長は記者会見で、現在は技術的な制約があるが、将来は津波の高さを早く予想するのに使える可能性があるとの見方を示した。（2011/06/13-22:09）

  22. 東北の「秘湯」が消える

    2008/07/07 -

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Media Coverage 14

  1. トカラ地震1カ月、過去にない長期化要因 浅い位置までマグマ上昇か

    朝日新聞

    2025/07/26

    Type: Newspaper, magazine

  2. トカラ列島で前例ない地殻変動を観測 わずか3日間で宝島と小宝島が10センチ離れる

    テレビ朝日　テレ朝ニュース

    2025/07/12

    Type: TV or radio program

  3. トカラ列島 島が約10センチ離れる地殻変動 “過去にない動き”

    NHK　ニュースウォッチ９

    2025/07/09

    Type: TV or radio program

  4. 東日本大震災で遅れたMの把握、南海トラフで挽回なるか 測位衛星を活用、1分以内で算出 Myself

    産経新聞　産経新聞

    2025/03

    Type: Newspaper, magazine

  5. GPSを活用...14年前の教訓を次の巨大地震でいかす 東北大学の研究者が取り組む地震解析 Myself

    TBS　TBS News

    2025/03

    Type: TV or radio program

  6. 地震研究の最前線 「M7.9」「津波6m」発災直後なぜ東日本大震災は過小評価されてしまったのか？“GPS活用”新たな地震解析に挑む研究者の挑戦 Myself

    TBC 東北放送　Nスタみやぎ

    2025/02/11

    Type: TV or radio program

  7. 迫る巨大地震

    北海道建設新聞　北海道建設新聞

    2023/01/16

    Type: Newspaper, magazine

  8. ソフトバンク、独自基準点データ活用のためのコンソーシアムを設立

    株式会社インプレス　ケータイWatch　https://k-tai.watch.impress.co.jp/docs/news/1437050.html

    2022/09

    Type: Internet

  9. Self-driving cars and earthquakes have more in common than you’d think

    temblor Inc.　Temblor Earth News　http://doi.org/10.32858/temblor.254

    2022/04

    Type: Internet

  10. 近づく千島海溝沿い巨大地震 いざという時どこに避難するか…「明日起きても驚かない」と研究者

    北海道放送　「今日ドキッ！」

    2021/03

    Type: TV or radio program

  11. 次世代の先導者 津波 数分で正確に予測

    日経産業新聞

    2017/09/07

    Type: Newspaper, magazine

  12. 余効滑り域、震災震源近接 ２日前の最大前震分析 東北大

    河北新報

    2012/10/01

    Type: Newspaper, magazine

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    東日本大震災の本震２日前の昨年３月９日に発生したマグニチュード（Ｍ）７．３の最大前震の余効滑りの領域が、２日間で本震の震源付近に及んでいたとの研究結果を、東北大地震・噴火予知研究観測センターの太田雄策助教（測地学）らがまとめた。分析には衛星利用測位システム（ＧＰＳ）に加え、海底水圧計も使った。同装置で前震から本震までの一連の地殻変動を解明したのは初めて。本震を誘発したか否かは不明だが、震源へのひずみの集中につながった可能性があるという。 従来はＧＰＳで計測した陸側プレート（岩板）の地殻変動データから、余効滑り域の範囲やプレート境界の滑り量を推計するのが一般的だった。 太田助教らは、東北大などが沖合に設置した海底水圧計で観測した地殻変動データも分析し、ＧＰＳだけを用いる従来の手法よりも高い精度で範囲や滑り量を推定。前震の余効滑りが本震の震源付近に迫っていたことを突き止めた。 余効滑り域は東

  13. ニューステラス関西 「津波警報研究最前線」

    NHK

    2011/07/08

    Type: TV or radio program

  14. BBC Radio 4 "Frontiers"

    BBC

    2011/06/22

    Type: Other

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    Large numbers of seismologists fear the recent earthquake in Japan reveals greats gaps in their science. Attention in the country has focused on the threat to Tokyo and to the south, where danger still lurks; but experts admit they underestimated the danger to the north, where the quake and tsunami struck in March. If even the Japanese experts, the best prepared in the world, can get it wrong, what other dangers is seismology missing? Roland Pease investigates from Japan.

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Other 4

  1. リアルタイム・マルチGNSS解析時系列のノイズ特性の解明

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    プレート境界では幅広い時間帯域において様々な現象が発生する．これまで「1日毎」のGNSS (主としてGPS) データ解析によってプレート境界における地震間のゆっくりすべり等が数多く見出されてきた．しかし，巨大地震発生直後の数時間スケールでの余効変動や，数日以下の時定数を持つゆっくりすべりなどは現状のGNSS解析技術ではその精度が十分ではない．一方でこのような時間帯域の地殻変動を正確に把握することはプレート境界の状態を把握する上で極めて重要である．そのためには，数日以下の時定数を持つゆっくりとしたプレート境界上のすべり現象を，GNSSデータから，準実時間で自動検知することが極めて重要であり，その実現のためにはそうした時間帯域のGNSSデータを実時間で解析する手法が極めて有効である．一方で，GNSSデータの実時間(リアルタイム)解析においては，未知パラメータ数に対して観測データの数が十分ではなく，さらに水蒸気分布の時空間変化等の影響によって，得られる時系列のシグナル/ノイズ比が低い．また近年，GPSだけではなく，複数のGNSS衛星を用いたマルチGNSS解析が行われつつあるが，そうしたマルチGNSS環境下でのリアルタイム解析結果のノイズ特性は現状ほとんど分かっておらず，そうした時間帯域における地殻変動の監視を困難にしている． このような背景のもと，本研究では数日程度以下の時間帯域における将来的な地殻変動モニタリングを見据え，リアルタイム・マルチGNSS時系列のノイズ特性を明らかにする．具体的には静止体および精密可動台を用いた移動体におけるリアルタイムGNSSデータを様々なパラメータによって解析し，それらからGNSS時系列のノイズ特性を抽出することによって，数日以下の非地震性すべりをGNSSデータによって自動検知するための基礎データを得る．

  2. 津波予測支援のためのGNSSリアルタイム解析に関する研究

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    本共同研究は、津波の予測に必要な地震の地殻変動、震源断層モデルについて、GNSS観測データを用いて即時、的確に推定する技術、その他必要な技術を実用化するために実施するものである。

  3. 2011年東北地方太平洋沖地震による東日本地域の地殻構造の地震波速度変化と地殻変動

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    本研究は、巨大地震によって引き起こされた東日本の地殻変動と地震波速度変化を、防災科学技術研究所、国土地理院や東北大学の地震波、ＧＰＳ、ＩｎＳＡＲのデータを利用し、精度良く推定することを目的とする。 具体的には、日本側は大地震による地殻変動推定、地震波速度変化の要因解明を担当し、フランス側はデータセンター構築と４次元速度変化分布の推定を主に担当する。 両国の研究チームが相互補完的に取り組み、得られた成果を比較検討することで、これまでにない地震活動が起きている東北地方の地殻構造の状態を明らかにする。また、その成果は、今後の地震火山活動を評価する上での基礎的な資料となることが期待される。

  4. 高精度RTK-GPSシステムの開発

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    本共同研究では，株式会社ジオサーフが有しているGPS受信機用制御ソフトウェア技術と，理学研究科が有する地震・火山発生地域に設置してあるオンライン化済GPS受信機とLINUX-BOXを用い，高精度RTK-GPSシステムを構築することを目的としたソフトウェア・システム開発を行う．