Details of the Researcher

PHOTO

Hirokazu Moriya
Section
Graduate School of Engineering
Job title
Professor
Degree

  • 博士（工学）（東北大学）

Committee Memberships 5

  • 日本非破壊検査協会　アコースティック・エミッション部門主査

    2022/06 - Present

  • 日本地熱学会学会賞選考委員会　委員

    2006/11 - Present

  • 社団法人 日本非破壊検査協会 アコースティックエミッション特別研究委員会　幹事

    2006/07 - Present

  • 日本地熱学会編集委員会　委員

    2004/12 - Present

  • 日本地熱学会地中熱利用専門部会　幹事

    2004/12 - Present

Professional Memberships 8

  • 日本非破壊検査協会

    - Present

  • 日本地震学会

  • Geothermal Resources Council

  • 資源・素材学会

  • 物理探査学会

  • 日本地熱学会

  • American Geophysical Union

  • Socisety for Exploration Geophysicist

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Research Interests 4

  • 総合自然エネルギーシステム

  • AE/微小地震

  • 次世代型地熱開発

  • 地下計測

Research Areas 2

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Measurement engineering /

  • Energy / Earth resource engineering, energy science / 地球物理学

Awards 7

  1. 日本非破壊検査協会学術奨励賞

    2017/06/06　日本非破壊検査協会

  2. IIIAE Paper Award

    2016/12/07　International Institute of Innovative Acoustic Emission

  3. （社）岩の力学連合会 フロンティア賞

    2016/06/18　（社）岩の力学連合会

  4. Best paper Award, ASMP2006

    2006/11/29　Japan Society of Mechanical Engineers

  5. 石田記念財団研究奨励賞

    2006/09/08　（財）石田(實)記念財団

  6. 日本地熱学会研究奨励賞

    2004/12/01　日本地熱学会

  7. 第1回青葉工学振興会研究奨励賞

    1995/10/20　青葉工学振興会

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Papers 137

  1. Developing future engineering leaders: Evaluating a novel entrepreneurship education course

    Yuko Suto, Hirokazu Moriya, Yoshiaki Ikenoue, Yasumasa Sasaki

    The International Journal of Management Education　23　(2)　101084-101084　2025/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijme.2024.101084 　

    ISSN： 1472-8117

  2. P–S Travel-Time Detection and Hypocenter Location of Low-SNR Events Using Polarization in the Time–Frequency Domain

    Jingyi Sun, Yusuke Mukuhira, Takayuki Nagata, Taku Nonomura, Michael C. Fehler, Hirokazu Moriya, Nori Nakata, Takatoshi Ito

    Bulletin of the Seismological Society of America　2024/06/07

    Publisher: Seismological Society of America (SSA)

    DOI： 10.1785/0120230280 　

    ISSN： 0037-1106

    eISSN： 1943-3573

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    ABSTRACT The detection of microseismic events with low signal-to-noise ratios (SNRs) can expand the seismic catalog and provide opportunities for a deeper understanding of subsurface reservoir features. We propose a novel polarization analysis method for comprehensively detecting S-wave arrival and P–S travel time of low-SNR events from the particle motion of P and S waves in the time and frequency domain. In most circumstances, the direct S-wave particle motion shows a flat plane, and that is perpendicular to the direct P-wave motion direction. We combine these two properties to detect the S-wave arrival of low-SNR events. Our previous study applied spectral matrix (SPM) analysis to characterize the 3D particle motion of P waves. However, SPM analysis had limitations in detecting S-wave arrivals. We then introduce the time-delay components of the SPM (complex spectral matrix [cSPM]) to characterize the S-wave particle motion, separate the S-wave from the noise, and detect S-wave arrivals. Using the cSPM analysis method, we assess the planarity and perpendicularity of the S-wave polarization in the time and frequency domains. We then define a characteristic function that detects S-wave arrivals by combining two properties, planarity and perpendicularity, to detect more low-SNR events. The P–S travel time is obtained by setting the threshold values for the P- and S-wave characteristic functions. We apply our method to 4 hr and 2 months of field data recorded at the Groningen field in the Netherlands. Our method successfully detects the P–S travel time of all catalog events and several additional undetected events. We locate the hypocenter of all events using the detected P–S travel times with a grid-based search method.

  3. Polarization Analysis in Time-Frequency Domain by Complex Spectral Matrix -Application to Various Mode of Seismogram-

    Takayuki Nagata, Yusuke Mukuhira, Jingyi Sun, Hirokazu Moriya, Takahiro Shiina, Taku Nonomura

    IEEE Transactions on Geoscience and Remote Sensing　1-1　2024

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/tgrs.2024.3352817 　

    ISSN： 0196-2892

    eISSN： 1558-0644

  4. Machine learning automatic picker for geothermal microseismicity analysis for practical procedure to reveal fine reservoir structures Peer-reviewed

    Kyosuke Okamoto, Yusuke Mukuhira, Dian Darisma, Hiroshi Asanuma, Hirokazu Moriya

    Geothermics　116　102832-102832　2024/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.geothermics.2023.102832 　

    ISSN： 0375-6505

  5. Scaling Microseismic Cloud Shape During Hydraulic Stimulation Using In Situ Stress and Permeability Peer-reviewed

    Y. Mukuhira, M. Yang, T. Ishibashi, K. Okamoto, H. Moriya, Y. Kumano, H. Asanuma, S. A. Shapiro, J. L. Rubinstein, T. Ito, K. Yan, Y. Zuo

    Journal of Geophysical Research: Solid Earth　128　(8)　2023/08/16

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2023jb026839 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  6. Borderless Engineering Taster Program Using Remote Tools

    Ai FUNAYAMA, Hirokazu MORIYA

    Journal of JSEE　71　(1)　1_45-1_50　2023

    Publisher: Japanese Society for Engineering Education

    DOI： 10.4307/jsee.71.1_45 　

    ISSN： 1341-2167

    eISSN： 1881-0764

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    The pandemic has made human mobility difficult and face-to-face study abroad programs were replaced with online ones using remote tools. This has led to a rethinking of the form of study abroad. This research compares the education benefits and motivations of the onsite and online versions of the Tohoku University High School Bridging Program which has been ongoing since before the pandemic. As a result, we found that each onsite and online program had different features of achievements in English skills and awareness. Rather than substituting online as a temporary alternative measure of the inability to travel abroad, we believe that it is meaningful to choose the method according to the educational objectives.

  7. サンガク レンケイ キカク 「 コンナ 『 ケンキュウ ト キョウイク 』 ガ オモシロイ 」 アントレプレナー キョウイク Peer-reviewed

    70　(10)　496-499　2022/10

    Publisher:

    DOI： 10.20665/kakyoshi.70.10_496 　

    ISSN： 0386-2151

    eISSN： 2424-1830

  8. AE Methods for Geothermal Development Invited Peer-reviewed

    森谷祐一, 椋平祐輔

    非破壊検査　71　(6)　245-250　2022/06

    Publisher:

    ISSN： 0367-5866

  9. Development of dental inspection method: Nondestructive evaluation of an adhesive interface by ACTIVE acoustic emission Peer-reviewed

    Ryoma Ezaki, Atsuhi Mine, Kazuhisa Sato, Ken-ichi Fukui, Keigo Kumada, Masahiro Yumitate, Shintaro Ban, Azusa Yamanaka, Mariko Matsumoto, Bart Van Meerbeek, Hirokazu Moriya, Toshiyuki Hashida, Hirofumi Yatani

    Journal of Prosthodontic Research　65　(2)　236-242　2022/04

    DOI： 10.2186/jpr.jpr_d_20_00260 　

    ISSN： 1883-1958

    eISSN： 1883-9207

  10. Identification of similar seismic waves using the phase-only correlation function and wavelet transform Peer-reviewed

    Hirokazu Moriya

    Energies　14　(4527)　2021/07

    DOI： 10.3390/en14154527 　

    eISSN： 1996-1073

  11. The effect of a gouge layer on rupture propagation along brittle shear fractures in deep and high-stress mines Peer-reviewed

    S.B. Mngadi, A. Tsutsumi, Y. Onoe, M.S.D. Manzi, R.J. Durrheim, Y. Yabe, H. Ogasawara, S. Kaneki, N. Wechsler, A.K. Ward, M. Naoi, H. Moriya, M. Nakatani

    International Journal of Rock Mechanics and Mining Sciences　137　104454-104454　2021/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijrmms.2020.104454 　

    ISSN： 1365-1609

  12. Low SNR microseismic detection using direct P-wave arrival polarization Peer-reviewed

    Y. Mukuhira, O.V. Polianinikov, M.C. Fehler, H. Moriya

    Bulletin of the Seismological Society of America　110　(6)　3115-3129　2020

    DOI： 10.1785/0120190192 　

    ISSN： 0037-1106

    eISSN： 1943-3573

  13. Diastereoselective Methylation at the Congested beta-Position of a Butenolide Ring: Studies toward the Synthesis of seco-Prezizaane-Type Sesquiterpenes

    Tomoyoshi Kawamura, Hirokazu Moriya, Masatoshi Shibuya, Yoshihiko Yamamoto

    JOURNAL OF ORGANIC CHEMISTRY　84　(19)　12508-12519　2019/10

    DOI： 10.1021/acs.joc.9b02017 　

    ISSN： 0022-3263

    eISSN： 1520-6904

  14. In-situ stress constraints on the focal mechanisms of induced seismicity Peer-reviewed

    Y. Mukuhira, T. Ito, M.C. Fehler, M. Naoi, H. Moriya, H. Asanuma, M. O. Häring

    Proc. ISRM2019　1380-1387　2019/09

  15. Integration of underground mapping, petrology, and high-resolution microseismicity analysis to characterise weak geotechnical zones in deep South African gold mines Peer-reviewed

    S. B. Mngadi, R. J. Durrheim, M. S.D. Manzi, H. Ogasawara, Y. Yabe, H. Yilmaz, N. Wechsler, G. Van Aswegen, D. Roberts, A. K. Ward, M. Naoi, H. Moriya, M. Nakatani, A. Ishida, SATREPS Team, ICDP DSeis Team

    International Journal of Rock Mechanics and Mining Sciences　114　79-91　2019/02

    DOI： 10.1016/j.ijrmms.2018.10.003 　

    ISSN： 1365-1609

  16. In-situ acoustic emission monitoring in mines

    G. Manthei, K. Plenkers, J. Philipp, M. Naoi, H. Moriya, M. Nakatani

    53rd U.S. Rock Mechanics/Geomechanics Symposium　2019

  17. Low SNR seismicity detection using features of 3D particle motions of direct P-waves Peer-reviewed

    Yusuke Mukuhira, Oleg V. Poliannikov, Michael C. Fehler, Hirokazu Moriya

    2018 SEG International Exposition and Annual Meeting, SEG 2018　2882-2886　2019

    DOI： 10.1190/segam2018-2965365.1 　

    ISSN： 1052-3812

    eISSN： 1949-4645

  18. Emergence and disappearance of very small repeating earthquakes on a geological fault in a gold mine in South Africa Peer-reviewed

    Junya Yamaguchi, Makoto Naoi, Masao Nakatani, Hirokazu Moriya, Toshihiro Igarashi, Osamu Murakami, Yasuo Yabe, Raymond Durrheim, Hiroshi Ogasawara

    TECTONOPHYSICS　747　318-326　2018/11

    DOI： 10.1016/j.tecto.2018.10.014 　

    ISSN： 0040-1951

    eISSN： 1879-3266

  19. Acoustic Emission/Seismicity at Depth Beneath an Artificial Lake after the 2011 Tohoku Earthquake Peer-reviewed

    Hirokazu Moriya

    Applied Science　8　(1407)　2018/08

    DOI： 10.3390/app8081407 　

    ISSN： 2076-3417

    eISSN： 2076-3417

  20. Identification of similar seismic events using a phase-only correlation technique Peer-reviewed

    Hirokazu Moriya

    Construction and Building Materials　168　(20)　984-987　2018/04/20

    DOI： 10.1016/j.conbuildmat.2018.03.053 　

    ISSN： 0950-0618

    eISSN： 1879-0526

  21. Spatial distribution of coherent microseismic events at Cooper Basin, Australia

    Yusuke Kumano, Hirokazu Moriya, Hiroshi Asanuma, Doone Wyborn, Hiroaki Niitsuma

    Society of Exploration Geophysicists - SEG International Exposition and 76tth Annual Meeting 2006, SEG 2006　595-599　2018

  22. Identification of microseismic multiplets in the frequency domain and interpretation of reservoir structure at Basel, Switzerland

    Hiroshi Asanuma, Yusuke Kumano, Hirokazu Moriya, Hiroaki Niitsuma, Ulrich Schanz, Markus Häring

    78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008　1451-1455　2018

  23. Hybrid focal mechanism determination: Constraining focal mechanisms of injection induced seismicity using in situ stress data Peer-reviewed

    Y. Mukuhira, K. Fuse, M. Naoi, M. C. Fehler, H. Moriya, T. Ito, H. Asanuma, M. O. Häring

    Geophysical Journal International　215　(2)　1427-1441　2018

    DOI： 10.1093/GJI/GGY333 　

    ISSN： 0956-540X

    eISSN： 1365-246X

  24. Buried microseismic detection from continuous data using spectral matrix analysis of triaxial particle motion Peer-reviewed

    Yusuke Mukuhira, Michael Fehler, Moriya Hirokazu

    SEG Technical Program Expanded Abstracts 2017　2797-2801　2017/09

    DOI： 10.1190/segam2017-17589398.1 　

    ISSN： 1052-3812

    eISSN： 1949-4645

  25. Observational Studies in South African Mines to Mitigate Seismic Risks: Challenges and Achievements Peer-reviewed

    R. J. Durrheim, H. Ogasawara, M. Nakatani, Y. Yabe, M. Naoi, H.Moriya, A. Cichowicz, T. Satoh, H. Kawakata, A.Milev, T. Kgarume, V.Z. Brink, T. Ward, L. Ribeiro, M. Manzi, S. Mngadi, the SATREPS Team

    MineSafe2017　1　30-31　2017/06

  26. Pore pressure migration during hydraulic stimulation due to permeability enhancement by low-pressure subcritical fracture slip Peer-reviewed

    Yusuke Mukuhira, Hirokazu Moriya, Takatoshi Ito, Hiroshi Asanuma, Markus Häring

    Geophysical Research Letter　44　(7)　3109-3118　2017/05/01

    DOI： 10.1002/2017GRL072809 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  27. Observational studies in South African mines to mitigate seismic risks: challenges and achievements Peer-reviewed

    R. J. Durrheim, H. Ogasawara, M. Nakatani, Y. Yabe, M. Naoi, H. Moriya, A. Cichowicz, T. Satoh, H. Kawakata, A. Milev, T. Kgarume, A. V.Z. Brink, A. K. Ward, L. Ribeiro, M. S.D. Manzi, S. Mngadi

    ISRM AfriRock - Rock Mechanics for Africa　2017-October　175-188　2017

  28. 超音波を用いた骨深度計測の基礎研究 Peer-reviewed

    山田理顕, 森谷祐一, 笠井裕一, 須藤啓広

    中部日本整形外科災害外科学会雑誌　59　(3)　529-530　2016/08/01

    Publisher: THE CENTRAL JAPAN ASSOCIATION OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY

    DOI： 10.11359/chubu.2016.529 　

    ISSN： 0008-9443

    eISSN： 1349-0885

  29. Acoustic Emission Monitoring for Mitigating Seismic Risks in Deep Gold Mines in South Africa Peer-reviewed

    Makoto NAOI, Masao NAKATANI, Hirokazu MORIYA, Yasuo YABE

    Japanese Socienty for Rock Mechanics　12　(1)　12-22　2016/07/11

    Publisher: Japanese Society of Rock Mechanics

    DOI： 10.11187/ijjsrm.12.1_19 　

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    Gold mines in South Africa have mining depths of up to ~4 km. Mining in such depths under high-stress conditions induces many earthquakes, which pose serious hazard to mine workers. To mitigate seismic risks and to understand the role ofmicroearthquakes in earthquake generation processes, we have conducted ultra-sensitive seismic observations, which allow acoustic emissions (AEs) to be detected down to MW −5 (typical rupture size ~ several centimeters), at two South African gold mines. We have found out various modes of AE activity previously unknown from conventional seismic networks (detectability only down to MW ~ −1): AE activity before and after an MW 2.2 earthquake, AE activity likely reflecting damage accumulation processes ahead of an advancing mining front, and AEs occurring steadily along geological faults. This paper summarizes these findings, which received the fiscal 2016 frontier award of the Japanese Society for Rock Mechanics (JSRM).

  30. Unexpectedly frequent occurrence of very small repeating earthquakes (-5.1 <= M-w <=-3.6) in a South African gold mine: Implications for monitoring intraplate faults Peer-reviewed

    Makoto Naoi, Masao Nakatani, Toshihiro Igarashi, Kenshiro Otsuki, Yasuo Yabe, Thabang Kgarume, Osamu Murakami, Thabang Masakale, Luiz Ribeiro, Anthony Ward, Hirokazu Moriya, Hironori Kawakata, Shigeru Nakao, Raymond Durrheim, Hiroshi Ogasawara

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　120　(12)　8478-8493　2015/12

    DOI： 10.1002/2015JB012447 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  31. Delineation of large localized damage structures forming ahead of an active mining front by using advanced acoustic emission mapping techniques Peer-reviewed

    Hirokazu Moriya, Makoto Naoi, Masao Nakatani, Gerrie van Aswegen, Osamu Murakami, Thabang Kgarume, Anthony K. Ward, Raymond J. Durrheim, Joachim Philipp, Yasuo Yabe, Hironori Kawakata, Hiroshi Ogasawara

    INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES　79　157-165　2015/10

    DOI： 10.1016/j.ijrmms.2015.08.018 　

    ISSN： 1365-1609

    eISSN： 1873-4545

  32. Steady activity of microfractures on geological faults loaded by mining stress International-coauthorship Peer-reviewed

    Makoto Naoi, Masao Nakatani, Kenshiro Otsuki, Yasuo Yabe, Thabang Kgarume, Osamu Murakami, Thabang Masakale, Luiz Ribeiro, Anthony Ward, Hirokazu Moriya, Hironori Kawakata, Raymond Durrheim, Hiroshi Ogasawara

    TECTONOPHYSICS　649　100-114　2015/05

    DOI： 10.1016/j.tecto.2015.02.025 　

    ISSN： 0040-1951

    eISSN： 1879-3266

  33. Monitoring of microseismicity in deep gold mines in South Africa Invited Peer-reviewed

    Yabe, Y, M. Nakatani, M. Naoi, H. Moriya, J. Philipp, C. Janssen, H. Kawakata, R. Durrheim, G. Dresen, H. Ogasawara

    Schatzalp Induced Seismicity workshop　2015/03/10

  34. Quasi-static slip patch growth to 20 m on a geological fault inferred from acoustic emissions in a South African gold mine Peer-reviewed

    Makoto Naoi, Masao Nakatani, Thabang Kgarume, Sifiso Khambule, Thabang Masakale, Luiz Ribeiro, Joachim Philipp, Shigeki Horiuchi, Kenshiro Otsuki, Koji Miyakawa, Atsushi Watanabe, Hirokazu Moriya, Osamu Murakami, Yasuo Yabe, Hironori Kawakata, Nana Yoshimitsu, Anthony Ward, Raymond Durrheim, Hiroshi Ogasawara

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　120　(3)　1692-1707　2015/03

    DOI： 10.1002/2014JB011165 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  35. Frequency-Magnitude Distribution of-3.7 <= M-W <= 1 Mining-Induced Earthquakes Around a Mining Front and b Value Invariance with Post-Blast Time Peer-reviewed

    Makoto Naoi, Masao Nakatani, Shigeki Horiuchi, Yasuo Yabe, Joachim Philipp, Thabang Kgarume, Gilbert Morema, Sifiso Khambule, Thabang Masakale, Luiz Ribeiro, Koji Miyakawa, Atsushi Watanabe, Kenshiro Otsuki, Hirokazu Moriya, Osamu Murakami, Hironori Kawakata, Nana Yoshimitsu, Anthony Ward, Ray Durrheim, Hiroshi Ogasawara

    PURE AND APPLIED GEOPHYSICS　171　(10)　2665-2684　2014/10

    DOI： 10.1007/s00024-013-0721-7 　

    ISSN： 0033-4553

    eISSN： 1420-9136

  36. Observational studies of the rock mass response to mining in highly-stressed gold mines in South Africa Peer-reviewed

    H. Ogasawara, M. Nakatani, R.J.Durrheim, M. Naoi, Y. Yabe, H. Moriya, G.F. Hofmann, C. Stander, D.P. Roberts, P. de Bruin, J. Oelofse, H. Kato, A. Cichowicz, D. Birch, D. Ngobeni, A. Milev, T. Kgarume, T. Satoh, S. Horiuchi, H. Kawakata, O. Murakami, N. Yoshimitsu, A.K. Ward, J. Wienand, P. Lenegan, H. Yilmaz, S. Mngadi, P.S. Piper, T.N. Clements, S. Nakano, M. Okubo, H. Ishii, A.V. Visser

    Proc. Seventh International Conference on Deep and High Stress Mining　to be published　2014/09/18

  37. Acoustic Emissions Down to Magnitude Mw = −5 Delineating Damages Around Mining Stopes and Pre-existing Faults: Spatial Distribution, Temporal Change and Source Parameters Peer-reviewed

    Makoto Naoi, Masao Nakatani, Hirokazu Moriya, Kenshiro Otsuki, Yasuo Yabe, Osamu Murakami, Hironori Kawakata, Hiroshi Ogasawara

    Institute of Mine Seismology 24th Seminar on Monitoring & Modelling the Seismic Rock Mass Response to Mining　2014/05/05

  38. Observational studies in South African mines to mitigate seismic risks: a mid-term review of the five-year SATREPS project Peer-reviewed

    R.J. Durrheim, H. Ogasawara, M. Nakatani, Y. Yabe, A.M. Milev, A. Cichowicz, H. Kawakata, H. Moriya, M. Naoi, T. Kgarume, O. Murakami, A.V.Z Brink, G. Ferreira, G. Henry, R. Teleka, J. Kuijpers, S. Mngadi, A Ward, J. Wienand, the SATREPS Research Group

    The Southern African Institute of Mining and Metallurgy 6th South African Rock Engineering Symposium SARES 2014　241-250　2014/05/01

  39. Observational studies in South African mines to mitigate seismic risks: implications for mine safety and tectonic earthquakes Peer-reviewed

    Raymond Durrheim, Hiroshi Ogaswara, Masao Nakatani, Yasuo Yabe, Alexander Milev, Artur Cichowicz, Hironori Kawakata, Hirokazu Moriya, Makoto Naoi, Thabang Kgarume, Osamu Murakami, Siyanda Mngadi

    European Geosciences Union General Assembly 2014　EGU2014-13713　2014/04/29

  40. In-situ monitoring of rock mass response to mining: Japanese-South African collaborative research Peer-reviewed

    H. Ogasawara, M. Nakatani, Y. Yabe, H. Kawakata, T. Satoh, H. Moriya, H. Kato, M. Naoi, S. Nakao, O. Murakami, N. Yoshimitsu, R. Durrheim, A. Milev, A. Cichowicz

    Proceedings of 8th International Symposium Rockburst and Seismicity in Mines (RaSiM8)　51-60　2013/09/01

  41. Detection of mining-induced fractures associated with stress perturbation around a stope in Ezulwini gold mine, South Africa, by using AE events Peer-reviewed

    Hirokazu Moriya, Makoto Naoi, Masao Nakatani, Osamu Murakami, Thabang Kgarume, Anthony K. Ward, Ray Durrheim, Joachim Philipp, Yasuo Yabe, Hironori Kawakata, Hiroshi Ogasawara

    Proc. 6th International Symposium on In-Situ Rock Stress　567-602　2013/08/22

  42. Observational studies in South African mines to mitigate seismic risks: a mid-project progress report Peer-reviewed

    R. J. Durrheim, H. Ogasawara, M. Nakatani, Y. Yabe, A.M. Milev, A. Cichowicz, H. Kawakata, H. Moriya, the SATREPS, Research Group

    Proc. 13th SAGA Biennial Conference and Exhibition　to be published　2013/06/01

  43. Application of the collapsing method on acoustic emission events during monitoring of microcracking around a gas-pressure loaded borehole in rock salt formation Peer-reviewed

    G. Manthei, H. Moriya, T. Popp

    Progress in Acoustic Emission XVI　175-180　2012/11/30

  44. Detection of mining-induced fractures around a stope in Ezulwini gold mine, South Africa, by using AE events with similar waveforms Peer-reviewed

    Hirokazu Moriya, Makoto Naoi, Masao Nakatani, Thabang Kgarume, Anthony K. Ward, Ray Durrheim, Philipp Joachim, Yasuo Yabe, Hironori Kawakata, Hiroshi Ogasawara

    Progress in Acoustic Emission XVI　181-186　2012/11/27

  45. Magnitude-frequency distributions of AEs associated with the mining front and pre-existing faults – cases from SATREPS array operating in a South African gold mine Peer-reviewed

    Makoto Naoi, Masao Nakatani, Joachim Philipp, Shigeki Horiuchi, Kenshiro Otsuki, Thabang Kgarume, Gilbert Morema, Sifiso Khambule, Thabang Masakale, Koji Miyakawa, Atsushi Watanabe, Moriya Hirokazu, Osamu Murakami, Yasuo Yabe, Hironori Kawakata, Nana Yoshimitsu, Hiroshi Ogasawara

    Proc. European Center for Geodynamics and Seismology Workshop　2012/11/01

  46. Ultrasonic Measurement of Bone Thickness for Spinal Surgery Peer-reviewed

    Michiaki Yamada, Hirokazu Moriya, Takahiro Iino, Yuichi Kasai, Akihiro Sudo, Atsumasa Uchida

    IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL　59　(9)　2077-2088　2012/09

    DOI： 10.1109/TUFFC.2012.2429 　

    ISSN： 0885-3010

    eISSN： 1525-8955

  47. Imaging of deep structure using reflection waves detected by spectral matrix analysis and confidence levels Peer-reviewed

    H. Moriya

    Journal of Acoustic Emission　29　29-41　2011/12/01

  48. Identification and classification of similar seismic events by using phase-only correlation technique. Peer-reviewed

    Hirokazu Moriya

    Proc. 10th SEGJ International Symposium　10　133-136　2011/11/20

  49. Phase-only correlation of time-varying spectral representations of microseismic data for identification of similar seismic events Peer-reviewed

    Hirokazu Moriya

    GEOPHYSICS　76　(6)　WC37-WC45　2011/11

    DOI： 10.1190/GEO2011-0021.1 　

    ISSN： 0016-8033

  50. Observational Studies of Earthquake Preparation and Generation to Mitigate Seismic Risks in Mines Peer-reviewed

    H. Ogasawara, R. Durrheim, M. Nakatani, Y. Yabe, A. Milev, A. Cichowicz, H. Kawakata, O. Murakami, M. Naoi, H. Moriya, T. Satoh, SATREPS research group

    Proc. IUGG　in press　2011/06/28

  51. RELATIONSHIP BETWEEN HYPOCENTRAL DISTRIBUTION AND GEOLOGICAL STRUCTURE IN THE HORONOBE AREA, NORTHERN HOKKAIDO, JAPAN Peer-reviewed

    Tetsuya Tokiwa, Koichi Asamori, Naoto Hiraga, Osamu Yamada, Hirokazu Moriya, Hikaru Hotta, Itaru Kitamura, Hideharu Yokota

    PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE ON ENVIRONMENTAL REMEDIATION AND RADIOACTIVE WASTE MANAGEMENT, 2010, VOL 2　117-122　2011

  52. ESTIMATION OF CRUSTAL STRUCTURE IN HORONOBE AREA, HOKKAIDO, JAPAN, BY USING MULTIPLET-CLUSTERING ANALYSIS Peer-reviewed

    HIROKAZU MORIYA, KOICHI ASAMORI, ITARU KITAMURA, HIKARU HOTTA, HIDEFUMI OHARA AND, TADAFUMI NIIZATO

    Journal of Acoustic Emission　28　1-10　2010/12

  53. Imaging of deep structure using reflection waves detected by spectral matrix analysis and confidence levels Peer-reviewed

    H. Moriya

    Progress in Acoustic Emission XV　15　289-294　2010/11/17

  54. Evaluation of fluid flow in enhanced geothermal reservoirs based on induced microseismic multiplets Peer-reviewed

    Hirokazu Moriya, Hiroaki Niitsuma, Roy Baria

    Trans. Geothermal Resources Council　34　407-412　2010/10/27

  55. Hypocentral distribution and geological structure in the Horonobe area, northern Hokkaido, Japan Peer-reviewed

    Tetsuya Tokiwa, Koichi Asamori, Naoto Hiraga, Osamu Yamada, Hirokazu Moriya, Hikaru Hotta, Itaru Kitamura

    Proc. ICEM2010　40054　1-6　2010/10

  56. 条件有利地域における地中熱ヒートポンプシステムの採熱特性と最適運転法の検討 Peer-reviewed

    池上真紀, 関川絵美子, 森谷祐一, 浅沼宏, 新妻弘明

    日本地熱学会誌　33　(3)　169-184　2010/08

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj.32.169 　

    ISSN： 0388-6735

    eISSN： 1883-5775

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    In this paper, the quantitative evaluation of performance and advantages of Geothermal Heat Pump (GeoHP) system in Yumoto District in Fukushima Prefecture, Japan, was studied comparing to other ordinary areas, where the geothermal gradient and the thermal conductivity these values are 3-4 and 1.7 times larger than those in other ordinary areas shown in literatures, respectively. In this study, the GeoHP was operated at Yumoto Nursery School and the numerical simulation has also been carried out to analyze the dynamic behavior of GeoHP system, considering the geothermal gradients and thermal conductivities.<BR>It was revealed that the outgoing fluid temperature of circulation fluid in Yumoto was about 3-4°C higher than that of an ordinary area after the operation for 30 days, and that the thermal conductivity much affect the temperature change. Under a condition of 8 hours continuous operation a day, the electric power consumption of the compressor was 3.1-6.7% lower and the COP of the system was 0.2-0.4 higher in Yumoto than those in ordinary area. The maximum amount of extracted heat for 15 years under this operation condition in Yumoto was estimated to be 1.4-1.7 times larger than that in an ordinary area. It was also revealed that the room temperature recovers in only 30 minutes after an intermission of 8 hours operation a day to the same level as the 24 hours continuous operation. The electric power consumption of the compressor in the intermittent operation exceeded the case of continuous operation only in the first 20 minutes after the heat pump system restarted. It was suggested that these demerits of the intermittent operation, such as room temperature drop and higher electricity consumption after the intermission, are smaller than the demerits of the fall of the ground temperature in the continuous operation, and that the intermittent operations are suitable for the geothermal heat pump system.

  57. INDUCED MICROSEISMIC MULTIPLET AS AN INDICATION OF FLUID FLOW IN GEOTHERMAL RESERVOIR Peer-reviewed

    Hirokazu Moriya, Hiroaki Niitsuma, Roy Baria

    Proc. Renewable Energy E2010　CD-ROM　2010/06/30

  58. Appropriate operation and its advantages of geothermal heat pump system in a high geothermal gradient and high thermal conductivity area Peer-reviewed

    M. Ikegami, E. Sekikawa, H. Moriya, H. Asanuma, H. Niitsuma

    Proc. Renewable Energy 2010　CR-ROM　2010/06

  59. Interpretation of reservoir creation process by super-resolution mapping of microseismic multiplets collected at Basel, Switzerland Peer-reviewed

    H.Asanuma, Y. Kumano, H. Moriya, H. Niitsuma, M. Haring

    Proc. WGC2010　CD-ROM　2010/05/01

  60. Effect of geothermal gradient to thermal conductivity estimated using line heat source theory Peer-reviewed

    Hirokazu Moriya, Emiko Sekikawa, Maki Ikegami, Hiroshi Asanuma, Hiroaki Niitsuma

    日本地熱学会誌　32　(2)　87-96　2010/04

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj.32.87 　

    ISSN： 0388-6735

    eISSN： 1883-5775

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    In this paper, we examine how the thermal conductivity estimated on line-source theory is affected by geothermal gradient, where we discuss it through a numerical simulation referring the real data obtained at Yumoto, Fukushima, Japan. <BR>The thermal conductivity of layer estimated though thermal response test is usually apparent thermal conductivity and the estimate of apparent thermal conductivity is affected by the underground conditions such as groundwater flow and geothermal gradient. Then, we have calculated the apparent thermal conductivity using a simulator on FEM, where we changed the geothermal gradients and conditions for approximation of thermal response curves. It has been revealed that the estimated thermal conductivities have different trends depending on the thermal response curve used for estimation such as circulation test or recovery test, and heating or cooling. It has also been revealed that the difference between actual thermal conductivity and its estimates has been 7.3 in maximum to the actual thermal conductivity in case of Yumoto, where the thermal gradient is 0.106 /m.

  61. Effective conditions to detect crack wave radiating from a fluid-filled crack in a finite test piece of rock Peer-reviewed

    Shin Ito, Kotaro Sekine, Hirokazu Moriya, Kazuo Hayashi

    Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　76　(762)　158-163　2010

    Publisher: Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaia.76.158 　

    ISSN： 0387-5008

    eISSN： 1884-8338

  62. A Japanese - South African collaboration to mitigate seismic risks in deep gold mines Peer-reviewed

    Ogasawara, H, R.J. Durrheim, M. Nakatani, Y. Yabe, A. Milev, A. Cichowicz, H. Kawakata, H. Moriya, JST-JICA SA, research group

    Proceedings of 1st Hard Rock Safe Safety Conference, South African Institute of Mining and Metallurgy　115-134　2009/12

  63. Observational study to mitigate seismic risks in mines: a new Japanese –South African collaborative project Peer-reviewed

    Durrheim, R.J, H. Ogasawara, M. Nakatani, Y. Yabe, A. Milev, A. Cichowicz, H. Kawakata, H. Moriya, the JST-JICA SA, research group

    Proceedings of South African Geophysical Association Biennial Technical Meeting and Exhibition　73-79　2009/12

  64. Development of simulator for Geothermal Heat Pump System considering groundwater flow Peer-reviewed

    森谷祐一, 山田貴大, 新堀雄一, 浅沼 宏, 新妻弘明

    日本地熱学会誌　31　(4)　203-212　2009/12/01

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj.31.203 　

    ISSN： 0388-6735

    eISSN： 1883-5775

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    A simulator for the geothermal heat pump system considering the groundwater flow has been developed. It is known that the groundwater flow affects the ability of heat extraction such as transient response and recovery of temperature. Therefore, it is necessary to simulate the dynamic behavior of the underground heat extraction system in order to evaluate the heat extraction rate. In this paper, the heat flow in the borehole, U-tube and subsurface layers with groundwater flow have been modeled by using the advective-diffusive equation, and the temporal change of temperature has been calculated based on Finite-Element Method (FEM). We analyzed a thermal response test (TRT) data and have clarified that the tool in this paper can simulate the heat flow in the layers associated with the groundwater flow and also represents the heat exchange between U-tube and layers. It has also been demonstrated that the simulator can examine the relationship between groundwater flow and apparent thermal conductivity, groundwater flow and temperature change of layers with time during heat extraction.

  65. Spectral matrix analysis method for the detection of wave arrivals using confidence levels and its application to seismic reflection imaging Peer-reviewed

    Hirokazu Moriya

    Proc. 9th SEGJ International Symposium　CD-ROM　2009/12/01

  66. Spectral matrix analysis for detection of polarized wave arrivals and its application to seismic reflection studies using local earthquake data Peer-reviewed

    Hirokazu Moriya

    EARTH PLANETS AND SPACE　61　(12)　1287-1295　2009

    DOI： 10.1186/BF03352982 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  67. Spectral Matrix Analysis Method for the Detection of Polarized Wave Arrivals Using Confidence Levels Invited Peer-reviewed

    H. Moriya

    Eos Trans. AGU, 87, Fall Meet. Suppl., Abstract　S12B-01　2008/12/15

  68. Estimation of crustal structure in Horonobe area, Hokkaido, Japan, by using Multiplet-clustering analysis Peer-reviewed

    H. Moriya, K. Asamori, I. Kitamura, H. Hotta, H. Ohara, T. Niizato

    Progress in Acoustic Emission XIV　415-422　2008/12/10

  69. Precise arrival time detection of polarized seismic waves using the spectral matrix Peer-reviewed

    Hirokazu Moriya

    GEOPHYSICAL PROSPECTING　56　(5)　667-676　2008/09

    DOI： 10.1111/j.1365-2478.2008.00713.x 　

    ISSN： 0016-8025

    eISSN： 1365-2478

  70. Mechanical and hydraulic coupling of injection-induced slip along pre-existing fractures Peer-reviewed

    Katsumi Nemoto, Hirokazu Moriya, Hiroaki Mitsuma, Noriyoshi Tsuchiya

    GEOTHERMICS　37　(2)　157-172　2008/04

    DOI： 10.1016/j.geothermics.2007.11.001 　

    ISSN： 0375-6505

    eISSN： 1879-3576

  71. Development of a Numerical Model of Geothermal Heat Pump Systems for Integrated Renewable Energy System Simulator Peer-reviewed

    Yoshihito Komantwa, Hirokazu Moriya, Hiroshi Asanuma, Hiroaki Nhtsuma

    Journal of the Geothermal Research Society of Japan　30　(3)　215-226　2008

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj1979.30.215 　

    ISSN： 1883-5775 0388-6735

    eISSN： 1883-5775

  72. Identification of microseismic multiplets in the frequency domain and interpretation of reservoir structure at Basel, Switzerland Peer-reviewed

    Hiroshi Asanuma, Yusuke Kumano, Hirokazu Moriya, Hiroaki Niitsuma, Ulrich Schanz, Markuks Häring

    SEG Technical Program Expanded Abstracts　27　(1)　1451-1455　2008/01

    DOI： 10.1190/1.3059187 　

    ISSN： 1052-3812

  73. Multiplet analysis for estimation of structures inside an AE cloud associated with a compression test of a salt rock specimen Peer-reviewed

    H. Moriya, G. Manthei, H. Niitsuma, J. Eisenblatter

    Journal of Acoustic Emission　24　196-204　2007/04/01

  74. Interpretation of pore-pressure propagation and fluid flow in the Soultz geothermal reservoir Peer-reviewed

    H. Moriya, H. Niitsuma, R. Baria

    Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract, T13A-0480　2006/12/11

  75. Laboratory experiments of injection-induced faulting in pre-fractured rock Peer-reviewed

    K. Nemoto, H. Moriya, H. Niitsuma

    Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract, T13A-0487　2006/12/11

  76. A NEW METHOD FOR EVALUATING DEGRADATION OF SOLID OXIDE FUEL CELL UNDER OPERATING CONDITIONS BY COMBINING THE Peer-reviewed

    Kazuhisa Sato, Shintaro Kyotani, Toshiyuki Hashida, Hirokazu Moriya, Tatsuya Kawada, Keiji Yashiro, Takashi Nakamura, Hiroo Yugami, Junichiro Mizusaki

    Proc. Asian Symposium on Materials and Processing　2006　132-132　2006/11/29

    Publisher: The Japan Society of Mechanical Engineers

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    The purpose of present research is to estimate the degradation mechanism of solid oxide fuel cell (SOFC) by using combining non-destructive test and electrochemical measurement during loading test Mechanical degradation and chemically degradation were investigated by acoustic emission (AE) measurement system and electrochemical measurement,respectively. In the investigation of fracture process with AE amplitude distributions, high amplitude signal, middle amplitude signal and low amplitude signal correspond to vertical craking, delamination in the cathode, and vertical cracking in the elctrolyte respectively. It was demonstrated that the AE method enabled us to detect the above-mentioned mechanical damage and to determine the condition for the onset of the damage in the single cell.

  77. Evaluation Method of Pore-pressure Propagation in Geothermal Reservoir during Hydraulic Stimulation by Using Induced Microearthquake Peer-reviewed

    H. Moriya, H. Niitsuma, R. Baria

    Proc. RE2006　CD-ROM　2006/10/12

  78. Evaluation of fracture system by coherence analysis of induced microsesmic events Invited Peer-reviewed

    Y. Kumano, H. Asanuma, H. Moriya, H. Niitsuma, K. Tezuka, D. Wyborn, R. Baria

    Proc. RE2006　CD-ROM　2006/10/12

  79. Application of an Integrated Renewable Energy System Simulator for Rural and Mountainous Area in Tohoku Region, Japan. Peer-reviewed

    Y. Komaniwa, H. Moriya, H. Asanuma, H. Niitsuma

    Proc. RE2006　CD-ROM　2006/10/12

  80. MULTIPLET ANALYSIS FOR ESTIMATION OF STRUCTURES INSIDE AN AE CLOUD ASSOXIATED WITH A COMPRESSION TEST OF A SALT ROCK SPECIMEN Invited

    HIROKAZU MORIYA, GERD MANTHEI, HIROAKI NIITSUMA, JÜRGEN EISENBLÄTTER

    Progress in Acoustic Emission XIII　137-144　2006/07/26

  81. Shear-wave splitting detected by using downhole triaxial seismic detector during dilation of artificial subsurface fracture Invited Peer-reviewed

    H Moriya, K Tanaka, H Niitsuma

    GEOPHYSICAL JOURNAL INTERNATIONAL　164　(2)　401-410　2006/02

    DOI： 10.1111/j.1365-246X.2005.02828.x 　

    ISSN： 0956-540X

    eISSN： 1365-246X

  82. Fault slip induced by injection of water and pore fluid flow Peer-reviewed

    Katsumi Nemoto, Hirokazu Moriya, Hiroaki Niitsuma

    WATER DYNAMICS　833　182-+　2006

    DOI： 10.1063/1.2207101 　

    ISSN： 0094-243X

    eISSN： 1551-7616

  83. Analysis of fracture propagation behavior using hydraulically induced acoustic emissions in the Bernburg salt mine, Germany Peer-reviewed

    H Moriya, T Fujita, H Niitsuma, J Eisenblatter, G Manthei

    INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES　43　(1)　49-57　2006/01

    DOI： 10.1016/j.ijrmms.2005.04.003 　

    ISSN： 1365-1609

  84. Spatial distribution of coherent microseismic events at Cooper Basin, Australia Peer-reviewed

    Yusuke Kumano, Hirokazu Moriya, Hiroshi Asanuma, Doone Wyborn, Hiroaki Niitsuma

    SEG Technical Program Expanded Abstracts　25　(1)　595-599　2006/01

    DOI： 10.1190/1.2370331 　

    ISSN： 1052-3812

  85. MEASUREMENT OF HYDRAULICALLY ACTIVATED SUBSURFACE FRACTURE SYSTEM IN GEOTHERMAL RESERVOIR BY USING ACOUSTIC EMISSION MULTIPLET-CLUSTERING ANALYSIS Peer-reviewed

    HIROKAZU MORIYA, HIROAKI NIITSUMA AND, ROY BARIA

    Journal of Acoustic Emission　23　113-118　2005/12

  86. Development of simulator for evaluating dynamic behavior of integrated renewable energy system with Geothermal Heat Pump Peer-reviewed

    Y. Komaniwa, H. Moriya, H. Asanuma, H. Niitsuma

    Trans. Geothermal Resources Council　29　71-75　2005/09/30

    ISSN： 0193-5933

  87. Estimation of detailed reservoir structure at Cooper Basin HDR field, Australia, by using microseismic multiplet Peer-reviewed

    Y. Kumano, H. Moriya, H. Asanuma, D. Wyborn, H. Niitsuma

    Trans. Geothermal Resources Council　29　93-97　2005/09/30

    ISSN： 0193-5933

  88. Multiplet analysis for estimation of critical pore-pressure of fractures inside geothermail reservoir Peer-reviewed

    H. Moriya, H. Niitsuma, R. Baria

    Proc. World Geothermal Congress 2005　CD-ROM　2005/04/28

  89. Estimation of radiation mechanism of AE multiplet observetion while hydraulic fracturing in HDR reservoir Peer-reviewed

    Y. Kumano, H. Moriya, H. Niitsuma

    Proc. World Geothermal Congress 2005　CD-ROM　2005/04/28

  90. The role of geothermal energy in the locally distributed renewable energy system (EIMY: Enegry In My Yard) Peer-reviewed

    H. Asanuma, H. Niitsuma, T. Nakata, Y. Niibori, H. Moriya, Y. Komaniwa

    Proc. World Geothermal Congress 2005　CD-ROM　2005/04/28

  91. Microseismicity and permeability enhancement of hydrogeologic structures during massive fluid injections into granite at 3 km depth at the Soultz HDR site Peer-reviewed

    KF Evans, H Moriya, H Niitsuma, RH Jones, WS Phillips, A Genter, J Sausse, R Jung, R Baria

    GEOPHYSICAL JOURNAL INTERNATIONAL　160　(1)　388-412　2005/01

    DOI： 10.1111/j.1365-246X.2004.02474.x 　

    ISSN： 0956-540X

  92. 間隙水圧の圧入にともなうき裂すべり模擬実験装置の開発と誘発すべり実験 Invited Peer-reviewed

    根本克己, 森谷祐一, 新妻弘明

    日本地熱学会誌　27　(1)　41-51　2005/01

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj1979.27.41 　

    ISSN： 0388-6735

    eISSN： 1883-5775

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    An experimental apparatus has been developed which simulates pore-fluid induced slip on a preexisting fracture. Experiments conducted using the apparatus yield insights into the mechanisms of shear slip induced by fluid injection and relationship between slip behavior and fluid flow. The apparatus construction allows injection of pore fluid directly into a pre-existing fracture in a cylindrical rock sample. Confining pressures and pore pressures up to 25 MPa and 40 MPa, respectively, can be adjusted to impose different stress on the sample. A micro-mass flow meter enables precise measurement of volume of fluid flow into the fracture. Preliminary experimental results are presented which confirm the abilities of the apparatus. Preliminary experimental result shows a characteristic intermittent slip and fluctuation in fluid flow synchronizing with the intermittent slip, implying significant effects of pore fluid injected on the shear slip of a pre-existing fracture.

  93. Measurment of hydraulically activated subsurface fracture system in geothermal reservoir by using acoustic emisson multiplet-clustering analysis Peer-reviewed

    H. Moriya, H. Niitsuma, R. Baria

    Progress in Acoustic Emission XII　233-238　2004/11

  94. Interpretation of reservoir creation process at Cooper Basion, Australia by acoustic emission Peer-reviewed

    Y.Kumano, H. Moriya, H. Niitsuma, H. Asanuma, N. Soma, H. kaieda, K. Tezuka, D. Wyborn, H. Niitsuma

    Progress in Acoustic Emission XII　263-270　2004/11

  95. Evaluation of parameter dependencies of AE accompanying sliding along a rough simulated fracture Peer-reviewed

    K. Nemoto, H. Moriya, H.Niitsuma

    Progress in Acoustic Emission XII　239-246　2004/11

  96. Evaluation of roughness effects on hydraulically induced slip and fluid flow into a fracture Peer-reviewed

    K. Nemoto, H. Moriya, H. Niitsuma

    Proc. on 1st International Workshop on Water Dynamics　135-138　2004/10

  97. Hydraulically induced slip due to fluid injection and pore fluid flow assoiated with the slip Peer-reviewed

    K. Nemoto, H. Moriya, H. Niitsuma

    Trans. Geothermal Resources Council　28　299-302　2004/09

  98. Estimation of critical pore pressure for shear slip of fractures at the soultz hot dry rock geothermal reservoir using microseismic multiplets Peer-reviewed

    H. Moriya, H. Niitsuma, R. Baria

    Elsevier Geo-Engineering Book Series　2　(C)　691-695　2004

    DOI： 10.1016/S1571-9960(04)80120-4 　

    ISSN： 1571-9960

  99. Multiplet-clustering analysis reveals structural details within the seismic cloud at the Soultz geothermal field, France Peer-reviewed

    H Moriya, H Niitsuma, R Baria

    BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA　93　(4)　1606-1620　2003/08

    DOI： 10.1785/0120020072 　

    ISSN： 0037-1106

  100. Anwendung der Collapsing-Methode auf Schallemissionsereignisse in einer Steinsalzprobe wahrend eines triaxialen Kompressionsversuchs Peer-reviewed

    Gerd Manthei, Hirokazu Moriya, Robert H. Jones, Hiroaki Niitsuma, Jurgen Eisenblatter

    DGZfP-Berichtsband　3　27-39　2003/03/01

  101. Estimation of Fracture System and Stress State of Ogachi HDR Reservoir by Using AE Multiplet Analysis Peer-reviewed

    Hirokazu Moriya, Shinichi Mlyano, Hiroaki Nlltsuma, Hideshi Kaieda

    Journal of the Geothermal Research Society of Japan　25　(1)　15-31　2003

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj1979.25.15 　

    ISSN： 1883-5775 0388-6735

    eISSN： 1883-5775

  102. Effect of normal stress and slip velocity on acoustic emission activity associated with shear slip Peer-reviewed

    K. Nemoto, H. Moriya, K. F. Evans, M. Nakatani, H. Niitsuma

    Proc. 28th Workshop on Geothermal Reservoir Engineering, Stanford University　CD-ROM　2003/01

    Publisher:

  103. Estimation of fine scale structures in Soultz HDR reservoir by using microseismic multiplets Peer-reviewed

    H. Moriya, S. Miyano, H. Niitsuma, R. Baria

    Proc. 28th Workshop on Geothermal Reservoir Engineering, Stanford University　CD-ROM　2003/01

  104. Anwendung der collapsing-methode zur erkennung von strukturen in wolkenarting verteilten ortungsanhaufungen in einer steinsalzprobe Peer-reviewed

    G. Manthei, H. Moriya, R. H. Jones, H. Niitsuma, J. Eisenblatter

    Bulletin of German Geophysical Society　1　9-12　2003/01

  105. Fracture System and Stress Field of Soultz Deep Reservoir Estimated by Multiplet-clustering Analysis of Induced Microseismic Events Peer-reviewed

    H. Moriya, S. Miyano, H. Niitsuma

    Trans. Geothermal Resources Council　26　229-233　2002/09

  106. Collapsing method for delineation of structures inside AE cloud associated with compression test of salt rock specimen Peer-reviewed

    H. Moriya, G. Manthei, S. Mochizuki, H. Asanuma, H. Niitsuma, R. H. Jones, J. Eisemblatter

    Progress in Acoustic Emissoon XI　11　282-289　2002/09

  107. Detecting Hydraulically Created Permeable Structures in the Soultz HDR Site by High Resolution Seismic Mapping Technique Peer-reviewed

    H. Niitsuma, H, Moriya, H, Asanuma, H, Evans, K. F, Jones, R. H, Jung, R, Baria, R

    Proc. 24th Newzeland Workshop　153-157　2002/05

  108. Detailed fracture system of the Soultz-Sous-Forets HDR field evaluated using microseismic multiplet analysis Peer-reviewed

    H Moriya, K Nakazato, H Niitsuma, R Baria

    PURE AND APPLIED GEOPHYSICS　159　(1-3)　517-541　2002/01

    ISSN： 0033-4553

  109. Evaluation of the Soultz HDR system by precise mapping techniques of induced microseismic event Peer-reviewed

    H. Moriya, K. Nakazato, K.F. Evans, H. Niitsuma, R.H. Jones, R. Baria

    Trans. Geothermal Resources Council　25　187-190　2001/09

  110. Study of hydraulically induced crack propagation in Bernburg salt mine, Germany, by using acoustic emission Peer-reviewed

    H. Moriya, T. Fujita, H. Niitsuma, J. Eisenblatter, G. Manthei

    Prograss in Acoustic Emission X　351-356　2000/09

  111. Estimation and characterization of subsurface fracture in Soultz HDR geothermal site by AE multiplet analysis Peer-reviewed

    K Nakazato, H. Moriya, H. Niitsuma, R. Baria

    Progress in Acoustic Emission X　269-274　2000/09

  112. Super-resolution mapping of AE multiplet for evaluation of structure and dynamic behavior of subsurface fractures in Ogachi HDR field Peer-reviewed

    H. Moriya, S. Miyano, H. Niitsuma, H. Kaieda

    Progress in Acoustic Emission X　281-286　2000/09

  113. Study of microseismic doublet/multiplet for evaluation of fracture system in Soultz HDR field Peer-reviewed

    H. Moriya, K. Nakazato, H. Niitsuma, R. Baria

    Proc. World Geothermal Congress 2000　3807-3812　2000/06

  114. Reevaluation of reservoir structure at Ogachi HDR field by precise source location of AE multiplet Peer-reviewed

    H. Moriya, S. Miyano, H. Niitsuma, H. Kaieda

    Proc. World Geothermal Congress 2000　3801-3806　2000/06

  115. Ogachi HDR reservoir evaluation by AE and geological methods Peer-reviewed

    H. Kaieda, R. Jones, H. Moriya, S. Sasaki, K. Ushijima

    Proc. World Geothermal Congress 2000　3755-3760　2000/06

  116. Ogachi HDR reservoir structure evaluated by microearthquake(AE) events Peer-reviewed

    H. Kaieda, R. Jones, H. Moriya, S. Sasaki

    Trans. Gothermal Resources Council　23　277-280　1999/10

  117. Current status of seismic and borehole measurements for HDR/HWR development Peer-reviewed

    H Niitsuma, M Fehler, R Jones, S Wilson, J Albright, A Green, R Baria, K Hayashi, H Kaieda, K Tezuka, A Jupe, T Wallroth, F Cornet, H Asanuma, H Moriya, K Nagano, WS Phillips, J Rutledge, L House, A Beauce, D Alde, R Aster

    GEOTHERMICS　28　(4-5)　475-490　1999/08

    DOI： 10.1016/S0375-6505(99)00024-3 　

    ISSN： 0375-6505

  118. Detection of traveltime delay caused by inflation of a single artificial fracture Peer-reviewed

    K. Tanaka, H. Moriya, H. Asanuma, H. Niitsuma

    Geothermal Science and Technology　6　181-200　1999/06

  119. Traveltime delay and micro shear-wave splitting in transmitted waves caused by pressurization of artificial fracture Peer-reviewed

    H. Moriya, K. Tanaka, H. Asanuma, H. Niitsuma

    Proc. 4th SEGJ International Symposium　97-103　1998/12

  120. Doublet analysis for characterizing regional structures in three-component microseismic measurement Peer-reviewed

    H. Moriya, H. Niitsuma

    AE/MA inGeologic Structures and Materials　401-410　1998/01

  121. Evaluation of traveltime delay and micro shear-wave splitting in transmitted wave during pressurization of an artificial single fracture Peer-reviewed

    K. Tanaka, H. Moriya, H. Asanuma, H. Niitsuma

    Proc. 3rd Well Logging Symposium of Japan　G1-G8　1997

  122. Estimation of regional in-situ stress field controlling subsurface fracture system by using microseismic multiplets Peer-reviewed

    H Moriya, H Niitsuma, JT Rutledge, M Fehler

    ROCK STRESS　247-252　1997

  123. Precise detection of a P-wave in low S/N signal by using time-frequency representations of a triaxial hodogram Peer-reviewed

    H Moriya, H Niitsuma

    GEOPHYSICS　61　(5)　1453-1466　1996/09

    DOI： 10.1190/1.1444071 　

    ISSN： 0016-8033

  124. Evaluation of Fracture System in Clinton County oil field, KY, by Using Microseismic Multiplets Peer-reviewed

    H.Moriya, J.T.Rutledge, H.Niitsuma, M.Fehler

    Abst. Workshop on Induced Seismicity (NARMS'96)　32　1996/06

  125. Identification of Reservoir Structure and Stress State from Hypocenter Cloud in Ogachi HDR Field, Japan, by Using Triaxial Doublet Analysis Peer-reviewed

    H.Moriya, H.Niitsuma, H.Kaieda

    3rd International HDR Forum Abstract　3　66-67　1996/05

  126. Subsurface stress field determination using multiplets in downhole three-component microseismic measurement Peer-reviewed

    H Moriya, H Niitsuma, JT Rutledge, H Kaieda

    ROCK MECHANICS TOOLS AND TECHNIQUES, VOLS 1 AND 2　2　853-858　1996

  127. Detection of Micro Shear-wave Splitting in Dilated Micro Crack Zone by Crosshole Three-component Seismic Measurement Peer-reviewed

    H. Moriya, H. Niitsuma

    Proc. 3rd SEGJ/SEG Int. Symp.　3　55-62　1995/10

  128. Time-Frequency Coherency Analysis of the Seismic Signals Peer-reviewed

    A. Lesniak, H. Moriya, H. Niitsuma

    Proc. 3rd SEGJ/SEG Int. Symp.　3　94-101　1995/10

  129. Calibration Method Using The Spectral Matrix for Downhole Triaxial Seismic Detectors Peer-reviewed

    H. Niitsuma, H. Moriya, K. Nagano

    AE/MA in Geologic Structures and Materials　611-624　1995/05

  130. Evaluation of Geothermal Reservoir Structures by a New Downhole Seismic Technique Peer-reviewed

    H. Niitsuma, M. Sato, H. Asanuma, H. Moriya

    Proc. World Geothermal Congress　2　793-798　1995/05

  131. Characterization of Subsurface Crack System by Combining Triaxial Doublets Analysis and Focal Mechanism Analysis Peer-reviewed

    H. Moriya, H. Niitsuma

    Geothermal Science & Technology　5　123-145　1995/01

  132. Determination of Subsurface Stress Direction by Means of AE Doublet Source Location and Focal Mechanism Analysis Peer-reviewed

    H. Moriya, H. Niitsuma

    Progress in Acoustic Emission 7　7　481-486　1994/10

  133. Downhole Triaxial AE Measurement during Hydraulic Fracturing Test at Yunomori Site and Estimation of Dynamic Behavior of Subsurface Fracture Peer-reviewed

    K. Hisamatsu, H. Moriya, H. Asanuma, M. Sato, N. Shinohara, M. Tateno, H. Niitsuma

    Progress in Acoustic Emission 7　425-430　1994/10

  134. Downhole AE measurement of hydraulic fracturing in Ogachi HDR model field Peer-reviewed

    Koji Nagano, Hiroshi Asanuma, Motoyuki Sato, Hiroaki Niitsuma

    journal of the geothermal research society of japan　16　(1)　85-108　1994

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj1979.16.85 　

    ISSN： 1883-5775 0388-6735

    eISSN： 1883-5775

  135. PRECISE SOURCE LOCATION OF AE DOUBLETS BY SPECTRAL MATRIX ANALYSIS OF TRIAXIAL HODOGRAM Peer-reviewed

    H MORIYA, K NAGANO, H NIITSUMA

    GEOPHYSICS　59　(1)　36-45　1994/01

    DOI： 10.1190/1.1443532 　

    ISSN： 0016-8033

  136. Development and calibration of downhole triaxial AE detectors for subsurface and civil engineering AE measurements Peer-reviewed

    S. Nagashima, H. Moriya, H. Niitsuma

    Progress in Acoustic Emission 6　6　407-413　1992/10

  137. Precise Estimation of AE Source Direction by Spectral Matrix Analysis Peer-reviewed

    H. Moriya, K. Nagano, H. Niitsuma

    Progress in Acoustic Emission 5　244-251　1990

Show all ︎Show first 5

Misc. 93

  1. 第26回国際AEシンポジウム報告—Report on 26th International Acoustic Emission Symposium

    松尾 卓摩, 伊藤 海太, 森谷 祐一

    非破壊検査 : Jjournal of the Japanese Society for Non-destructive Inspection / 日本非破壊検査協会 編　72　(6)　232-235　2023/06

    Publisher: 日本非破壊検査協会

    ISSN： 0367-5866

  2. 3C15 Effect of future creation co-education with industry based on financial thinking -Development of a six-year engineering education system at research-based universities, Report VIII-

    須藤祐子, 森谷祐一, 池ノ上芳章, 佐々木保正

    工学教育研究講演会講演論文集(Web)　2023　2023

    ISSN： 2424-1458

  3. Automatic event picker based on deep leaning for seismic network in geothermal fields and detailed understanding of reservoir structures

    岡本京祐, 椋平祐輔, 浅沼宏, 森谷祐一

    日本地熱学会学術講演会講演要旨集　2023　2023

  4. 3C15 Effect of future creation co-education with industry based on financial thinking－Development of a six-year engineering education system at research-based universities, Report VIII－

    SUTO Yuko, MORIYA Hirokazu, IKENOUE Yoshiaki, SASAKI Yasumasa

    Proceedings of Annual Conference of Japanese Society for Engineering Education　2023　248-249　2023

    Publisher: Japanese Society for Engineering Education

    DOI： 10.20549/jseeja.2023.0_248 　

    ISSN： 2189-8928

    eISSN： 2424-1458

  5. 新年特別座談会 プラスチックリサイクルの行方 : プラ新法と産廃処理業者の役割—INDUST特集 プラスチックリサイクルの行方 : プラ新法と産廃処理業者の役割

    平尾 禎秀, 森口 祐一, 石塚 勝一, 長田 和志, 片渕 昭人, 森谷 賢

    Indust = いんだすと : 産廃処理と資源循環の総合専門誌 / 「いんだすと」編集部 編　37　(1)　2-31　2022/01

    Publisher: 全国産業資源循環連合会

    ISSN： 1343-5841

  6. Estimation of principal stress direction in geothermal reservoir using induced microseismic events during hydraulic stimulation

    MORIYA Hirokazu

    The Proceedings of the Materials and Mechanics Conference　2022　GS0211　2022

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemm.2022.gs0211 　

    eISSN： 2424-2845

    More details Close

    In geothermal development, fluid is injected into subsurface fractures in reservoirs to improve productivity. At that time, understanding tectonic stress is important to estimate the portion where the permeability is improved. Tectonic stress can be measured in a borehole, but it requires drilling of the borehole, and the measurement in the deep borehole is costly and time-consuming. In this presentation, the tectonic stress measurement method using induced AE (Acoustic Emission) is introduced, where fracture planes are estimated from accurately estimated AE source distribution and the estimated possible slip directions of the fracture planes.

  7. Microseismic cloud growth process controlled by regional stress

    椋平祐輔, 伊藤高敏, 岡本京祐, 石橋琢也, 浅沼宏, 熊野裕介, 森谷祐一, YANG Meihua, YAN Kangnan, ZUO Yunhei, RUBINSTEIN Justin, HAERING Markus O.

    日本地熱学会学術講演会講演要旨集　2021　2021

  8. 東北大学のアントレプレナー教育の現状と将来像

    池ノ上 芳章, 森谷 祐一

    青葉工業会報　65　5-7　2021

  9. Constraint on the range of the focal mechanism of microseismicity with In-situ Stress Information

    椋平祐輔, 直井誠, 森谷祐一, 伊藤高敏, 浅沼宏, HAERING Markus O.

    石油技術協会誌(CD-ROM)　85　(1-6)　2020

    ISSN： 2436-2840

  10. 地殻応力情報を用いた微小地震の断層面解範囲絞り込み

    椋平祐輔, 直井誠, FEHLER Michael C., 森谷祐一, 伊藤高敏, 浅沼宏, HAERING Markus O.

    日本地熱学会学術講演会講演要旨集　2019　2019

  11. 3F01 Program development fostering value creativity with financial issues (BS/PL/CS): Development of a six-year engineering education system at research-based universities, Report V.

    SUTO Yuko, IKENOUE Yoshiaki, MORIYA Hirokazu, SASAKI Yasumasa

    Proceedings of Annual Conference of Japanese Society for Engineering Education　2019　426-427　2019

    Publisher: Japanese Society for Engineering Education

    DOI： 10.20549/jseeja.2019.0_426 　

    ISSN： 2189-8928

    eISSN： 2424-1458

  12. き裂システムに対する注水時の間隙水圧伝播

    椋平祐輔, 森谷祐一, 伊藤高敏, 浅沼宏, HAERING M. O.

    日本地熱学会学術講演会講演要旨集　2018　2018

  13. 南アフリカ大深度金鉱山における微小破壊観測

    直井誠, 中谷正生, 矢部康男, 森谷祐一

    地盤工学研究発表会発表講演集(CD-ROM)　53rd　2018

  14. 2F18 English capacity building for the first year students at research-based university: Development of a six-year engineering education system at research-based universities, Report IV.

    SUTO Yuko, ANDO Akira, OKABE Tomonaga, MORIYA Hirokazu

    Proceedings of Annual Conference of Japanese Society for Engineering Education　2018　336-337　2018

    Publisher: Japanese Society for Engineering Education

    DOI： 10.20549/jseeja.2018.0_336 　

    ISSN： 2189-8928

    eISSN： 2424-1458

  15. 3軸AE信号の時間領域での主成分分析による到来波の簡易検出法の検討

    森谷祐一

    アコースティック・エミッション総合コンファレンス論文集　21st　2017

  16. 南アフリカCooke4金鉱山地下1kmの切羽沿いに密集する微小破壊の空間分布詳細構造

    山形直毅, 直井誠, 中谷正生, 森谷祐一, 大槻憲四郎, KGARUME Thabang, PHILIPP Joachim, 村上理, MASAKALE Thabang, RIBEIRO Luiz, 矢部康男, 川方裕則, WARD Anthony, 石田毅, DURRHEIM Ray, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2016　2016

  17. 南アフリカ大深度金鉱山の地質断層上で観測されたRepeating Earthquakeの出現と消失

    山口純弥, 直井誠, 中谷正生, 森谷祐一, KGARUME Thabang, 五十嵐俊博, 村上理, MASAKALE Thabang, 矢部康男, 大槻憲四郎, 川方裕則, 石田毅, WARD Anthony, DURRHEIM Ray, DURRHEIM Ray, 小笠原宏

    日本地球惑星科学連合大会予稿集(Web)　2016　2016

  18. 超音波を用いた骨深度測定の基礎実験

    山田理顕, 森谷祐一, 笠井裕一, 須藤啓広

    中部日本整形外科災害外科学会雑誌　58　2015

    ISSN： 0008-9443

  19. 南アフリカCooke4金鉱山1km深における,Mw≧0の地震に先行する時期に起こったAcoustic Emissionの活動度

    北代雅明, 直井誠, 中谷正生, 森谷祐一, 大槻憲四郎, KGARUME Thabang, PHILIPP Joachim, 村上理, MASAKALE Thabang, RIBEIRO Luiz, 矢部康男, 川方裕則, WARD Anthony, 石田毅, DURRHEIM Ray, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2015　2015

  20. 南アフリカ金鉱山地下1kmの採掘空洞前方で観察された板状分布を示すAE活動のb値と空間相関長の時間変化

    山形直毅, 直井誠, 中谷正生, 森谷祐一, 大槻憲四郎, KGARUME Thabang, PHILIPP Joachim, 村上理, MASAKALE Thabang, RIBEIRO Luiz, 矢部康男, 川方裕則, WARD Anthony, 石田毅, DURRHEIM Ray, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2015　2015

  21. 南アフリカ大深度金鉱山での地震被害低減のための震源至近距離観測研究-SATREPS等6カ年の活動のまとめ-

    小笠原宏, 加藤春實, HOFMANN Gerhard, 矢部康男, CICHOWICZ Artur, 堀内茂木, 大久保慎人, 中谷正生, 直井誠, 森谷祐一, 村上理, 佐藤隆司, 川方裕則, 吉光奈奈, DURRHEIM Ray, DURRHEIM Ray, WARD Anthony, MILEV Alex, 山口照寛, 中尾茂, 伊藤高敏, VAN ASWEGEN Gerrie

    日本地震学会秋季大会講演予稿集　2015　2015

  22. 南アフリカCooke 4金鉱山における微小破壊観測-SATREPS計画5カ年のまとめ-

    直井誠, 中谷正生, 森谷祐一, 大槻憲四郎, KGARUME Thabang, PHILIPP Joachim, 村上理, MASAKALE Thabang, RIVEIRO Luiz, 矢部康男, 川方裕則, WARD Anthony, DURRHEIM Ray, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2015　2015

  23. コーダ波スペクトル比法を用いた南アフリカEzulwini鉱山採掘前線における微小破壊の応力降下量推定

    村上理, 川方裕則, 佐々木裕哉, 直井誠, 中谷正生, PHILIPP Joachim, MASAKALE Thabang, KGARUME Thabang, RIBEIRO Luiz, 矢部康男, 森谷祐一, WARD Anthony, DURRHEIM Raymond, 小笠原宏

    日本地震学会秋季大会講演予稿集　2014　2014

  24. 南アフリカ金鉱山地下1km深において,載荷される断層上で観察された-5.1≦Mw≦-3.6の繰り返し地震

    直井誠, 中谷正生, 大槻憲四郎, KGARUME Thabang, PHILIPP Joachim, MASAKALE Thabang, RIBEIRO Luiz, 森谷祐一, 村上理, 矢部康男, 川方裕則, WARD Anthony, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2013　7　2013/10/01

  25. 位相限定相関関数を用いた類似AE波形の検出

    森谷祐一

    アコースティック・エミッション総合コンファレンス論文集　19th　2013

  26. 能動震源を用いた南アフリカ金鉱山微小破壊観測網のセンサー特性の時間変化の推定

    村上理, 川方裕則, 吉光奈奈, 吉光奈奈, 中谷正生, 直井誠, PHILIPP Joachim, MASAKALE Thabang, KGARUME Thabang, RIBEIRO Luiz, 森谷祐一, 矢部康男, WARD Anthony, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2013　2013

  27. 南アフリカ金鉱山における微小破壊(-3.7≦Mw≦1.3)の規模別頻度分布と採掘発破前後のb値の安定性

    直井誠, 中谷正生, PHILIPP Joachim, 堀内茂木, 大槻憲四郎, KGARUME Thabang, MOREMA Gilbert, KHAMBULE Sifiso, MASAKALE Thabang, 宮川幸治, 渡邉篤志, 森谷祐一, 村上理, 矢部康男, 川方裕則, 吉光奈奈, WARD Tony, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2012　169　2012/10/01

  28. 南アフリカ金鉱山地下1km深で観察された,クラックが準静的に20mまで成長したことを示唆するAE活動

    直井誠, 中谷正生, PHILIPP Joachim, 堀内茂木, 大槻憲四郎, KGARUME Thabang, MOREMA Gilbert, KHAMBULE Sifiso, MASAKALE Thabang, 宮川幸治, 渡邉篤志, 森谷祐一, 村上理, 矢部康男, 川方裕則, 吉光奈奈, WARD Tony, DURRHEIM Ray, 小笠原宏

    日本地震学会秋季大会講演予稿集　2012　26　2012/10/01

  29. 脊椎手術へ応用するための超音波を用いた骨深度計測の基礎研究

    山田理顕, 森谷祐一, 笠井裕一, 須藤啓広

    Journal of Spine Research　1　(4)　2010

    ISSN： 1884-7137

  30. 第17回アコースティック・エミッション総合コンファレンス 報告

    森谷 祐一

    非破壊検査 : journal of N.D.I　58　(11)　506　2009/11/01

    ISSN： 0367-5866

  31. バーゼル地熱フィールドで計測したAEマルチプレットの時空間解析

    浅沼宏, 熊野裕介, 森谷祐一, 新妻弘明, SCHANZ Ulrich, HAERING Markus

    日本地熱学会学術講演会講演要旨集　2008　2008

  32. 福島県天栄村湯本へき地保育所における地中熱ヒートポンプ冬季運転特性

    関川絵美子, 池上真紀, 新妻弘明, 浅沼宏, 森谷祐一, 小山志津夫

    日本地熱学会学術講演会講演要旨集　2008　2008

  33. 地下水が流動する地層における地中熱利用システムのシミュレータ-地下水流動と温度応答,見かけ熱伝導率との関係-

    森谷祐一, 山田貴大, 浅沼宏, 新妻弘明, 新堀雄一

    日本地熱学会学術講演会講演要旨集　2008　2008

  34. 福島県天栄村湯本地区における地中熱利用のためのサーマルレスポンス試験

    森谷祐一

    日本地熱学会平成20年学術講演会要旨集　2007　2007

  35. Analysis of Microearthquakes at the Horonobe Area, North of Hokkaido, Japan, by Using the Multiplet-clustering Analysis

    MORIYA Hirokazu, NIIZATO Tadafumi, KITAMURA Itaru, HOTTA Hikaru, OHARA Hidefumi

    115　46-49　2006/10/30

  36. 浅層の温度分布と地下水流動に関して （２）地下水のモニタリング技術

    森谷祐一

    日本地熱学会誌　28　(3)　307-314　2006/07/01

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI： 10.11367/grsj1979.28.307 　

    ISSN： 0388-6735

    eISSN： 1883-5775

  37. 再生可能エネルギー複合利用システムシミュレータを用いた東北の中山間地域での熱供給に関する考察

    駒庭義人, 森谷祐一, 浅沼宏, 新妻弘明

    日本地熱学会学術講演会講演要旨集　2006　2006

  38. AE波形類似度の空間分布による貯留層内き裂システムの評価

    熊野裕介, 熊野裕介, 浅沼宏, 森谷祐一, 手塚和彦, WYBORN Doone, BARIA Roy, 新妻弘明

    日本地熱学会学術講演会講演要旨集　2006　2006

  39. Advanced Technologies (最新技術)

    森谷 祐一

    日本地熱学会誌　27　(3)　197-198　2005/07/25

    ISSN： 0388-6735

  40. Development of simulator for evaluating dynamic behavior of integrated renewable energy system

    KOMANIWA Yoshihito, MORIYA Hirokazu, ASANUMA Hiroshi, NIITSUMA Hiroaki

    Proceedings of the Annual Meeting of Japan Society of Energy and Resources　24　295-298　2005/06/09

    Publisher: エネルギー・資源学会

    ISSN： 1881-9907

  41. 再生可能エネルギー複合利用システムの動特性解析用シミュレータの開発--個別要素のモデリングと実測データを用いたモデルの妥当性評価—第24回エネルギー・資源学会研究発表会講演論文集 ; セッション19 再生可能エネルギー

    駒庭 義人, 森谷 祐一, 浅沼 宏

    エネルギー・資源学会研究発表会講演論文集　24　295-298　2005/06

    Publisher: エネルギー・資源学会

    ISSN： 1880-1099

  42. Development of simulator for evaluating dynamic behavior of integrated renewable energy system

    KOMANIWA Yoshihito, MORIYA Hirokazu, ASANUMA Hiroshi, NIITSUMA Hiroaki

    21　261-264　2005/01/26

  43. 微小地震を用いたソルツフィールドの貯留層内圧力伝搬プロセスの評価

    森谷祐一, EVANS K. F., 新妻弘明, BARIA R.

    日本地熱学会学術講演会講演要旨集　2005　2005

  44. クーパー盆地HDRフィールドにおけるAEのDD法による貯留層構造の評価

    熊野裕介, 森谷祐一, 浅沼宏, WYBORN D., 新妻弘明

    日本地熱学会学術講演会講演要旨集　2005　2005

  45. 地中熱ヒートポンプを用いた再生可能エネルギー複合利用システムの動特性解析用シミュレータの開発

    駒庭義人, 森谷祐一, 浅沼宏, 新妻弘明

    日本地熱学会学術講演会講演要旨集　2005　2005

  46. Estimation of high permeable fracture zone based on AE associated with hydraulic fracturing

    MORIYA H., NIITSUMA H., BARIA R.

    2004　A26　2004/11/20

  47. Shear slip on a pre-existing fault and fluid flow under an over fluid pressure

    NEMOTO K., TSUCHIYA N., MORIYA H., NIITSUMA H.

    2004　B22　2004/11/20

  48. AE analysis observed in the Australian HDR development : Evaluation of fracture system in the reservoir by multiplet analysis

    KUMANO Y., MORIYA H., IZUMI T., ASANUMA H., SOMA N., KAIEDA H., TEZUKA K., WYBORN Doone, NIITSUMA H.

    2004　A30　2004/11/20

  49. Estimation of fracture system by hodogram analysis of induced AE during a hydraulic fracturing at Yufutsu oil and gas field

    MORIYA Hirokazu, OGASAWARA Yusuke, KOMANIWA Yoshito, NAGANO Koji, ASANUMA Hiroshi, NIITSUMA Hiroaki, TEZUKA Kazuhiko, DREW Julian, ENDO Tatsuki

    110　256-259　2004/05/25

  50. AE multiplet analysis of induced microseismic events associated with hydraulic fracturing test at Soultz in 2003

    SUGAWARA S., MORIYA H., SOMA N., KUMANO Y., IZUMI T., ASANUMA H., NIITSUMA H., BARIA R.

    2003　86-86　2003/11/20

  51. Effect of increase rate of pore pressure on injection-induced slip on simulated fracture

    NEMOTO K., MORIYA H., NIITSUMA H.

    2003　91-91　2003/11/20

  52. Estimation of pore-pressure during hydraulic fracturing experiment at Soultz field by using AE multiplet

    MORIYA H., NIITSUMA H., BARIA R.

    2003　81-81　2003/11/20

  53. Estimation of formation process of permeable fracture zone in the upper reservoir of Soultz field based on observation of waveform of multiplets associated with fracturing experiment

    KUMANO Y., MORIYA H., NIITSUMA H., BARIA R.

    2003　82-82　2003/11/20

  54. 地熱動向 第28回スタンフォード地熱貯留層工学ワークショップに参加して

    森谷 祐一

    地熱技術 / 地熱技術開発 [編]　28　(1・2)　17-23　2003/05

    Publisher: 地熱技術開発

    ISSN： 0285-1717

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    記事種別: 会議・学会報告・シンポジウム

  55. 水圧破砕時に誘発されるマルチプレットの波形観察に基づく地下き裂面の動的挙動推定-震源分布方向とせん断表面力方向との関係-

    熊野裕介, 森谷祐一, 新妻弘明, BARIA R

    日本地震学会秋季大会講演予稿集　2003　2003

  56. 模擬既存き裂の間隙水圧上昇に伴う誘発すべり挙動

    根本克己, 森谷祐一, 新妻弘明

    日本地震学会秋季大会講演予稿集　2003　2003

  57. ソルツフィールドにおける人工地熱貯留層造成のための水圧破砕に伴うAE・微小地震マルチプレットの解析

    森谷祐一, 新妻弘明, BARIA R

    日本地震学会秋季大会講演予稿集　2003　2003

  58. マルチプレット・クラスタリング解析によるソルツ深部貯留層の構造ならびに応力場の推定

    森谷祐一, 宮野真一, 相馬宣和, 浅沼宏, 新妻弘明, BARIA R

    日本地熱学会誌　25　(1)　2003

    ISSN： 0388-6735

  59. Application of dynamic response of a penny-shaped fluid-filled subsurface crack to fracture characterization in Higashi-Hachimantai field

    K. Nemoto, H. Moriya, K. F. Evans, M. Nakatani, H. Niitsma

    Proc. 28th Workshop on Geothermal Reservoir Engineering, Stanford University　CD-ROM　2003

  60. マルチプレット・クラスタリング解析によるソルツ深部貯留層の構造ならびに応力場の推定

    森谷祐一, 宮野真一, 相馬宣和, 浅沼宏, 新妻弘明, BARIA R

    日本地熱学会学術講演会講演要旨集　2002　2002

  61. 模擬き裂面の安定せん断すべりのAE発生挙動における有効垂直応力とすべり速度の影響

    根本克己, 森谷祐一, 新妻弘明, 中谷正生, EVANS K F

    日本地震学会秋季大会講演予稿集　2002　2002

  62. Estimation of reservoir structure of an analysis of AE multiplets observed during the hydraulic stimulation in Soultz, 2000

    MIYANO S., NAKAZATO K., SOMA N., MORIYA H., NIITSUMA H., BARIA R.

    2001　A50　2001/12/01

  63. Estimation of fluid flow fractures and its behavior inside the Soultz reservoir by using multiplet clustering analysis

    MORIYA H., NAKAZATO K., EVANS K. F., NIITSUMA H., BARIA R.

    2001　A49　2001/12/01

  64. 花こう岩模擬き裂面の安定すべりにおけるAEレートのパラメータ依存性

    根本克己, 森谷祐一, 新妻弘明, 中谷正生, EVANS K F, 矢部康男

    日本地震学会秋季大会講演予稿集　2001　2001

  65. 座談会 2020年における物理探査を考える—特集号 物理探査・21世紀への展望

    松岡 俊文, 森谷 祐一, 真田 佳典

    物理探査 = Geophysical exploration / 物理探査学会 編　53　(6)　555-565　2000/12

    Publisher: 物理探査学会

    ISSN： 0912-7984

  66. Evalution of fracture plane direction and stress field in Ogachi HDR reservoir by using AE doublet

    MIYANO S., MORIYA H., NIITSUMA H., KAIEDA H.

    2000　2000/01/20

  67. Analysis of behavior of AE multiplets occurrence at Soultz HDR Site

    NAKAZATO K., MORIYA H., NIITSUMA H., BARIA R.

    2000　2000/01/20

  68. On Characteristics of the Regenerator and Appropriate Design

    WATANABE Hiroichi, FUJISAWA Yuichi, MORIYA Shinji, Isshiki Naotsugu

    The Proceedings of the Symposium on Stirlling Cycle　2000.4　35-38　2000

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmessc.2000.4.35 　

    eISSN： 2424-2926

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    Over 98% at the regeneration efficiency of the Regenerator must be made with the goal so that the thermal efficiency of Stirling engine may achieve over 30%. Though the regeneration efficiency is improved, as the volume of Regenerator is increased, and as the area of the heating surface is increased, on the other hand dead space volume and pressure loss increase, and they become the output lowering of the engine. It is a problem that the regeneration efficiency measures the temperature change of operative gas and matrix of the Regenerator inside. However, the accurate thermometry is not possible, when the working fluid is the gas, since the flow velocity of the gas is big for the responsibility of temperature sensor. Then, model test by the water was tried instead of operative gas in this study. Features of the experiment using the water are that the measurement of the temperature behavior is easy, because that it can decrease the flow velocity in the equal Reynold's number region and fact of the matrix in which the model length is done can be increased.

  69. Ogachi project for HDR Geothermal Power(IX) -Fracture structure and stress in the reservoir evaluated by AE analysis-

    KAIEDA H., MORIYA H., SASAKI S.

    1999　1999/12/01

  70. Effect of stress on HDR/HWR reservoir formation at Ogachi and Soultz fields

    ITO T., MORIYA H., HAYASHI K.

    1999　1999/12/01

  71. Estimation of reservoir structure by precise mapping of AE multiplets associated with hydraulic fracturing experiment at Soultz HDR field in 1993

    NAKAZATO K., MORIYA H., NIITSUMA H., BARIA R.

    1999　1999/12/01

  72. Evaluation of stress state and dynamic behavior of fractures at Ogachi HDR field by using AE multiplet

    MORIYA H., NIITSUMA H., KAIEDA H.

    1999　1999/12/01

  73. Fracture and stress evaluation in the Ogachi HDR reservoir by AE method

    KAIEDA Hideshi, JONES R. H., MORIYA Hirokazu, SASAKI Shunji

    101　217-221　1999/10

  74. Study of AE Doublet and its Mechanisms for Evaluation of Reservoir Structure at Soultz Field

    MORIYA H., OYAMADA J., NIITSUMA H., BARIA R.

    21　(1)　62-63　1999/01/25

    ISSN： 0388-6735

  75. AEダブレットの高精度マッピングによる地熱貯留層内部構造の評価

    中里克久, 森谷祐一, 新妻弘明, BARIA R

    アコースティック・エミッション総合コンファレンス論文集　12th　1999

  76. AEマルチプレットを用いた地下応力場計測 -どのような応力場を推定することができるのか?-

    森谷 祐一, 手塚 和彦, 新妻 弘明

    資源・素材　1998　(1)　45-48　1998/11

    ISSN： 0919-7915

  77. Study of AE doublet and its mechanisms for evaluation of reservoir structure at Soultz field

    MORIYA H., OYAMADA J., NIITSUMA H.

    1998　1-31　1998/10/01

  78. Detection of structures inside AE cloud and relocation by Collapsing method

    ASANUMA Hiroshi, ISHIMOTO Manabu, MORIYA Hirokazu, NIITSUMA Hiroaki, JONES Rob

    物理探査学会学術講演会講演論文集　99　36-40　1998/10

  79. Precise mapping and estimation of source mechanisms of Acoustic Emission in salt mine in Bernburg, Germany

    FUJITA Takuo, MORIYA Hirokazu, NIITSUMA Hiroaki, EISENBLATTER Jurgen, MANTHEI Gerd

    物理探査学会学術講演会講演論文集　99　46-50　1998/10

  80. Analysis of AE Doublets Observed in the Soultz HDR Field

    OYAMADA J., MORIYA H., NIITSUMA H., BARIA R.

    日本地熱学会学術講演会講演要旨集　20　(1)　37-37　1998/01/25

    ISSN： 0388-6735

  81. Investigation of deep ground pressure measurement method.

    松木浩二, 古住光正, 山本清彦, 林一夫, 森谷祐一, 林為人, 山口勉, 尾原祐三

    日本鉱業振興会助成研究成果報告書　1998　1998

  82. Detection of shear-wave traveltime delay by using wavelet transform and characterizatin of an artificial subsurface fracture

    TANAKA Katsuro, MORIYA Hirokazu, ASANUMA Hiroshi, NIITSUMA Hiroaki

    物理探査学会学術講演会講演論文集　96　20-24　1997/05

  83. Superresolution underground measurement by the high-precise mapping method using AE doublet.

    森谷祐一, 新妻弘明

    資源・素材　1996　(1)　15　1996/10/21

    ISSN： 0919-7915

  84. Stress analysis by AE doublet. Is the measurement of a regional stress field possible ?

    森谷祐一, 新妻弘明

    資源・素材　1996　(2)　75-78　1996/10/21

    ISSN： 0919-7915

  85. Detection of traveltime delay caused by dilation of an artifical fracture due to pressurization

    TANAKA Katsuro, MORIYA Hirokazu, ASANUMA Hiroshi, NIITSUMA Hiroaki

    物理探査学会学術講演会講演論文集　95　43-47　1996/10

  86. Evaluation of Structural Plane and Stress Direction in Cornwall HDR Field by Triaxial AE Doublet Analysis.

    MORIYA H., MASUZAWA M., H. JONES R., P. GEEN A. s., NIITSUMA H.

    日本地熱学会学術講演会講演要旨集　18　(2)　160-160　1996/04/25

    ISSN： 0388-6735

  87. Fracture Characterization Method Utilizing High Magnetic Permeability Tracer(No. 9) -Automatic Logging Depth Correction by the SCOT Method-

    OSATO Kazumi, TAKASUGI Shinji, MORIYA Hirokazu, NIITUSMA Hiroaki

    物理探査学会学術講演会講演論文集　92　16-20　1995/06

  88. Estimation of borehole locus in Higashi-Hachimantai field by borehole inclination and crosswell seismic measurement

    KOBAYASHI Jun, ASANUMA Hiroshi, MORIYA Hirokazu, NIITSUMA Hiroaki

    物理探査学会学術講演会講演論文集　92　362-366　1995/06

  89. Triaxial Analysis and Estimation of Focal Mechanism of AE during Hydraulic Fracturing in Yunomori Field.

    HISAMATSU K, NIITSUMA H, MORIYA H, TATENO M, SHINOHARA N

    日本地熱学会学術講演会講演要旨集　17　(2)　165-165　1995/04/25

    ISSN： 0388-6735

  90. An application of the speech input to games

    第49回　(ネットワーク)　421-422　1994/09/20

  91. Text-to-Speech Software for Personal Computers

    第47回　(データ処理)　377-378　1993/09/27

  92. Triaxial Downhole AE Measurement and Evaluation of Subsurface Crack Extension during TG-2 Pre-hydraulic Fracturing Experiment in Yunomori Field.

    森谷祐一, 浅沼宏, 永野宏治, 佐藤源之, 新妻弘明, 舘野正之, 篠原信男

    日本地熱学会学術講演会講演要旨集　1993　1993

  93. AE doublet analysis for precise estimation of the relative location in tri-axial hodogram source location.

    森谷祐一, 新妻弘明

    アコースティック・エミッション総合コンファレンス論文集　7th　1989

Show all ︎Show first 5

Books and Other Publications 1

  1. 物理探査ハンドブック 第３章 微小地震・AE

    森谷 祐一

    1999/01

Presentations 91

  1. 採掘空洞前方の岩盤中での大規模亀裂の形成を示唆する微小破壊の震源分布

    直井誠, 森谷祐一, 中谷正生, 村上理

    地震発生の素過程研究集会　2015/02/23

  2. コーダ波スペクトル比法を用いた南アフリカEzulwini鉱山採掘前線における微小破壊の応力降下量推定

    村上理, 川方裕則, 佐々木友哉, 直井誠, 中谷正生, Joachim Philipp・Thabang Masakale・Thabang Kgarume・Luiz Ribeiro, 矢部康男, 森谷祐一, Anthony Ward・Raymond Durrheim, 小笠原宏

    日本地震学会秋季大会　2014/10/10

  3. Acoustic Emissions Down to Magnitude Mw = −5 Delineating Damages Around Mining Stopes and Pre-existing Faults

    M. Naoi, M. Nakatani, H. Moriya

    南アフリカ金鉱山の震源域での多点応力測定ワークショップ　2014/07/31

  4. 採掘空洞前方の岩盤中での大規模亀裂の形成を示唆する微小破壊の震源分布

    直井誠, 森谷祐一, 中谷 正生, 村上 理, Thabang Kgarume, Thabang Masakale,Luiz Ribeiro, 矢部 康男, 川方裕則

    日本地球惑星科学連合大会　2014/04/30

  5. 位相限定相関関数を用いた類似AE波形の検出

    第19回AE総合コンファレンス　2013/12/05

  6. 南アフリカ金鉱山地下1km深で観察された既存弱面に密集する高b値の微小破壊

    直井誠, 中谷正生, 大槻憲四郎, 矢部康男, Thabang Kgarume, Gilbert Morema, Joachim Philipp, Sifiso, Khambule, Thabang Masakale, Luiz Ribeiro, 森谷祐一, 村上理, 堀内茂木, 川方裕則, 吉光奈奈, 宮川幸治, 渡邉篤志, Tony Ward, Ray Durrheim, 小笠原宏

    日本地球惑星科学連合2013年大会　2013/05/19

  7. Thermal response test and GeoHP system in a high geothermal gradient area International-presentation

    KIGAM GSHP seminar　2013/04/29

  8. 東北大学工学部・工学研究科におけるチューター制度の運用

    佐賀大学国際交流推進センター・セミナー 「外国人留学生の教育・指導・支援を考える」　2013/02/01

  9. 南アフリカ金鉱山における微笑破壊（－3.7<Mw<1.3)の規模別頻度分布と採掘葉っぱ前後のb値安定性

    直井誠, 中谷正生, Joachim Philipps, 堀内茂木, 大槻憲四郎, Thabang Kgarume, Gilbert Morema, Sifiso Khambule, Thabang Masakale, 宮川幸治, 渡邉篤志, 森谷祐一

    地震学会　2012/10/10

  10. 南アフリカ金鉱山1km深で観測された，クラックが準静的に20mまで成長したことを示唆するAE活動

    直井誠, 中谷正生, Joachim Philipps, 堀内茂木, 大槻憲四郎, Thabang Kgarume, Gilbert Morema, Sifiso Khambule, Thabang Masakale, 宮川幸治, 渡邉篤志, 森谷祐一

    地震学会　2012/10/10

  11. Research Group of SATREPS, 鉱山での地震被害低減のための観測研究－日本と南アフリカの共同研究

    小笠原宏, R Durrheim, 中谷正生, 矢部康男, A. Milev, A. Cichowicz, 川方裕則, 森谷祐一, 佐藤隆司, S. Murphy, A. Ward, G. Morema, M. Kataka, R. Vermeulen, G. van Aswegen

    日本地球惑星科学連合2010年大会予稿集　2011/06

  12. A Japanese-South African Collaboration for Observational Study to Mitigate Seismic Risks in Mines

    Ogasawara, H, R.J. Durrheim, M. Nakatani, Y. Yabe, A. Milev, A. Cichowicz, H. Kawakata, H. Moriya, T. Satoh, SATREPS

    日本地震学会秋季大会　2009/12

  13. Spectral Matrix Analysis Method for the Detection of Polarized Wave Arrivals Using Confidence Levels International-presentation

    American Geophysical Union Fall Meeting　2008/12/15

  14. バーゼル地熱フィールドで計測したＡＥマルチプレットの時空間解析

    浅沼 宏, 熊野裕介, 森谷祐一, 新妻弘明, Schanz Ulrich, Markus Haring

    日本地熱学会平成20年度学術講演会　2008/11

  15. 地下水が流動する地層における地中熱利用システムのシミュレータ −地下水流動と温度応答，見かけ熱伝導率との関係−

    森谷祐一, 山田貴大, 浅沼 宏, 新妻弘明, 新堀雄一

    日本地熱学会平成２０年度学術講演会　2008/10/30

  16. 福島県天栄村湯本地区における地中熱利用のためのサーマルレスポンス試験

    森谷祐一, 清水優子, 駒庭義人, 松島悠人, 池上真紀, 浅沼宏, 新妻弘明

    日本地熱学会平成１９年度学術講演会　2007/11/30

  17. 類似波形を有する誘発微小地震の解析による地熱貯留層評価

    アコースティック・エミッション特別研究委員会　2007/06/29

  18. 地中熱利用のための基礎技術

    第1回東北地域支部会・地中熱ヒートポンプ技術講演会　2007/03/23

  19. 研究の現場から

    地中熱利用ヒートポンプシンポジウム（東京）　2006/12/19

  20. 再生可能エネルギー複合利用システムシミュレータを用いた東北の中山間地域での熱供給に関する考察

    駒庭義人, 森谷祐一, 浅沼 宏, 新妻弘明

    日本地熱学会平成１８年度学術講演会　2006/11/20

  21. マルチプレット・クラスタリング解析による北海道北部幌延地域の微小地震解析

    森谷,新里, 北村, 堀田,大原

    物理探査学会第１１５回学術講演会　2006/10/16

  22. 東北大学大学院工学研究科「学生国際工学研修プログラム」とその教育効果について

    日本国際教育交流協議会　2006/08/02

  23. 東北大学工学部・工学研究科におけるチューター制度の運用と教育効果

    外国人留学生の入国手続き等に関する説明会及び留学生実務担当者協議会　2006/06/02

  24. 透過弾性波のS波マイクロスプリッティングの検出と人工地下き裂の性状評価

    東京大学地震研特定共同研究Ｂ「リソスフェアの短波長不均質構造の物理的解釈」研究発表会　2006/01/12

  25. 微小地震を用いたソルツフィールドの貯留層内圧力伝搬プロセスの評価

    森谷祐一, エバンス キース, 新妻弘明, バリア ロイ

    日本地熱学会平成１７年度学術講演会　2005/11/25

  26. 地中熱ヒートポンプを用いた再生可能エネルギー複合利用システムの動特性解析用シミュレータの開発

    駒庭義人, 森谷祐一, 浅沼宏, 新妻弘明

    日本地熱学会平成１７年度学術講演会　2005/11/25

  27. クーパー盆地ＨＤＲフィールドにおけるＡＥのDD法による貯留層構造の評価

    浅沼,野崎, 新妻,ワイボーン

    日本地熱学会平成１７年度学術講演会　2005/11/25

  28. 再生可能エネルギー複合利用システムの動特性解析用シミュレータの開発－個別要素のモデリングと実測データを用いたモデルの妥当性評価－

    駒庭義人, 森谷祐一, 浅沼宏, 新妻弘明

    第24回エネルギー資源学会研究発表会講演論文集　2005/06/10

  29. 地熱を利用する

    仙台市第２回産学連携セミナー「寺子屋せんだい」　2005/02/21

  30. 自然エネルギー複合利用における動特性解析のためのシミュレーターの開発

    駒庭義人, 森谷祐一, 浅沼宏, 新妻弘明

    第21回エネルギーシステム・経済・環境コンファレンス講演論文集　2005/01/26

  31. オーストラリア高温岩体発電開発におけるAE解析 －マルチプレット解析による貯留層内き裂システム構造の推定－

    熊野裕介, 森谷祐一, 泉胤智, 浅沼宏, 相馬宣和, 海江田秀志, 手塚和彦, ワイボーン ドゥーン, 新妻弘明

    日本地熱学会平成１６年度学術講演会　2004/12/03

  32. 水圧破砕に伴うAEの高精度標定に基づく高透水ゾーンの推定

    日本地熱学会平成１６年度学術講演会　2004/12/02

  33. 勇払油ガス井における注水に伴うAEのホドグラム解析による震源標定とフラクチャ構造の推定

    森谷祐一, 小笠原祐輔, 駒庭義人, 永野宏治, 浅沼宏, 新妻弘明, 手塚和彦, Drew, Julian Drew, 遠藤立樹

    物理探査学会第109回学術講演会論文集　2004/05/27

  34. 2003年ソルツHDRフィールド水圧破砕にともなうAEマルチプレットの解析

    菅原聡, 森谷祐一, 相馬宣和, 泉胤智, 浅沼宏, 新妻弘明, Baria Roy

    日本地熱学会平成15年度学術講演会　2003/11/23

  35. 水圧破砕に伴うマルチプレットの波形観察に基づくソルツ浅部貯留層内透水き裂ゾーンの形成過程の推定

    熊野裕介, 森谷祐一, 新妻弘明, Baria Roy

    日本地熱学会平成15年度学術講演会　2003/11/23

  36. AEマルチプレット高精度標定に基づくソルツフィールド水圧破砕実験時の間隙水圧分布の推定

    森谷祐一, 新妻弘明, Baria Roy

    日本地熱学会平成15年度学術講演会　2003/11/23

  37. 模擬既存き裂の間隙水圧上昇に伴う誘発すべり挙動

    根本克己, 森谷祐一, 新妻弘明

    日本地震学会　2003/10/06

  38. ソルツフィールドにおける人工地熱貯留層造成のための水圧破砕に伴うAE・微小地震マルチプレットの解析

    森谷祐一, 新妻弘明, Baria Roy

    日本地震学会　2003/10/06

  39. 水圧破砕時に誘発されるマルチプレットの波形解析に基づく地下き裂面の動的挙動推定－震源分布方向とせん断表面力方向との関係ー

    熊野裕介, 森谷祐一, 新妻弘明, Raria Roy

    日本地震学会　2003/10/06

  40. ソルツ高温岩体発電実験フィールドにおける水圧破砕実験にともなう誘発微小地震の解析

    東京大学地震研究所特別セミナー　2003/06/20

  41. 東北大学における留学生交流の取り組み

    東北大学留学センターシンポジウム　2003/02/28

  42. マルチプレットクラスタリング解析によるソルツ深部貯留層の構造ならびに応力場の推定

    森谷祐一, 宮野慎一, 相馬宣和, 浅沼宏, 新妻弘明, バリア ロイ

    日本地熱学会平成14年度学術講演会　2002/11/23

  43. マルチプレットクラスタリング解析によるソルツ深部貯留層構造ならびに応力場の推定

    森谷,宮野, 相馬,浅沼, 新妻,バリア

    日本地熱学会平成14年度学術講演会　2002/11/23

  44. 模擬き裂面の安定せん断滑りのAE発生挙動における有効垂直応力とすべり速度の影響

    根本克己, 森谷祐一, 新妻弘明, 中谷正男, Evans Leith

    日本地震学会　2002/11/11

  45. Study of Induced Microearthquakes with Similar Waveforms in Soultz HDR field, France International-presentation

    USGS Earthquake Hazards Team Seminar Series　2002/09/30

  46. AEダブレット解析による雄勝高温岩体貯留層内き裂構造面方向と応力場評価

    宮野慎一, 森谷祐一, 新妻弘明, 海江田秀志

    日本地熱学会平成１３年度学術講演会　2001/11/22

  47. ソルツHDRフィールドにおかるAEダブレット発生挙動の解析

    中里克彦, 森谷祐一, 新妻弘明, バリア ロイ

    日本地熱学会平成１３年度学術講演会　2001/11/22

  48. 花崗岩模擬き裂面の安定すべりにおけるAEレートのパラメータ依存性

    根本, 森谷, 新妻, 中谷, Evans, 矢部

    日本地震学会2001年秋季大会　2001/10/26

  49. Model experiment of shear slip and seismic efficiency during hydraulic fracturing International-presentation

    Moriya, H, Nemoto, K, Niitsuma, H, Nakatani, M, Evans, K

    MTC/MURPHY meeting　2001/03/22

  50. Multilet clustering analysis of the Soultz 1993 seismicity -Evaluation of fluid flow behavior - International-presentation

    Moriya, H, Nakazato, K, Niitsuma, H, Jung, R, Evans, K, Baria, R

    MTC/MURPHY meeting　2001/03/22

  51. Analysis of microseismic multiplet at the Soultz in 1993 International-presentation

    Moriya, H, Nakazato, K, Niitsuma, H, Baria, R

    MTC/MURPHY meeting　2001/03/22

  52. AEダブレット解析による雄勝高温岩体貯留層内き裂構造面方向と応力場評価

    宮野, 森谷, 新妻, 海江田

    日本地熱学会平成１２年度学術講演会　2000/11/22

  53. ソルツHDRフィールドにおかるAEダブレット発生挙動の解析

    中里,森谷, 新妻,バリア

    日本地熱学会平成１２年度学術講演会　2000/11/22

  54. 高温岩体発電のための雄勝計画（ＩＸ） －ＡＥ計測から推定した貯留層の亀裂構造と地圧－

    海江田, 森谷, 佐々木

    日本地熱学会平成１１年度学術講演会　1999/12/03

  55. 雄勝及びソルツフィールドにおけるＨＤＲ／ＨＷＲ型地熱貯留層の構造と地殻応力の関係

    伊藤,森谷,林

    日本地熱学会平成１１年度学術講演会　1999/12/03

  56. ソルツＨＤＲフィールド１９９３年水圧破砕実験で観測されたＡＥダブレットの高精度震源位置標定による地下構造推定

    中里,森谷, 新妻,バリア

    日本地熱学会平成１１年度学術講演会　1999/12/03

  57. ＡＥマルチプレットを用いた雄勝高温岩体発電実験フィールドの応力場推定ならびにき裂動的挙動の評価

    森谷, 海江田, 新妻

    日本地熱学会平成１１年度学術講演会　1999/12/03

  58. ソルツHDRフィールド地下貯留層構造推定とその性状評価のためのAEダブレット解析

    中里,森谷, 新妻,バリア

    資源・素材学会東北支部 平成１１年度秋季大会講演　1999/11/16

  59. ＡＥダブレットの高精度マッピングによる地熱貯留層内部構造の評価

    中里,森谷, 新妻,バリア

    第１２回アコースティック・エミッション総合コンファレンス　1999/09/15

  60. ＡＥ観測に基づく雄勝高温岩体貯留層の評価

    海江田, 佐々木, ジョーンズ,森谷

    第６回地下と土木のＡＥ国内コンファレンス　1999/08/25

  61. ドイツBernburg岩塩鉱内水圧破砕にともなうＡＥの発生機構

    藤田,森谷, 新妻, アイゼンブレッター,マンタイ

    第６回地下と土木のＡＥ国内コンファレンス　1999/08/25

  62. ＡＥダブレットを用いたソルツＨＤＲフィールド貯留層微細構造の推定

    中里,森谷, 新妻,バリア

    第６回地下と土木のＡＥ国内コンファレンス　1999/08/25

  63. ＡＥの超解像マッピングに基づく地下き裂計測ならびに応力場の推定

    森谷,新妻, 海江田

    第６回地下と土木のＡＥ国内コンファレンス　1999/08/25

  64. Evaluation of shear displacement and seismic efficiency during hydraulic fracturing by a model experiment International-presentation

    Moriya, H, Nemoto, K, Niitsuma, H, Evans, K

    MURPHY/MTC meeting　1998/11/03

  65. Structure evaluation of Soultz HDR reservoir from precise location of doublet/multiplet International-presentation

    Moriya, H, Nakazato, K, Niitsuma, H, Baria, R

    MURPHY/MTC meeting　1998/11/03

  66. Re-evaluation of Ogachi HDR reservoir by using AE multiplet/doublet International-presentation

    Moriya, H, Jones, R, Niitsuma, H, Kaieda, H

    MURPHY/MTC meeting　1998/11/03

  67. ソルツＨＤＲフィールド貯留層構造評価のためのＡＥダブレット発生機構の考察

    森谷, 小山田, 新妻, バリア

    日本地熱学会平成10年度学術講演会　1998/10/29

  68. ＡＥマルチプレットを用いた地下応力場計測－どのような応力場を推定することができるのか？－

    森谷, 手塚, 新妻

    資源・素材関係学協会合同秋季大会　1998/10/23

  69. ベルンブルク岩塩鉱での水圧破砕にともなうＡＥのマッピングと発震機構の推定

    藤田, 森谷, 新妻, アイゼンブレッター, マンタイ

    物理探査学会第99回学術講演会論文集　1998/10/21

  70. ＡＥクラウド内の構造面検出とコラプシング法による震源位置再標定

    浅沼, 石本, 森谷, 新妻, ジョーンズ

    物理探査学会第99回学術講演会論文集　1998/10/21

  71. Traveltime Delay and Micro Shear-wave Splitting in Transmitted Waves Caused by Pressurization of Artificial Fracture International-presentation

    Moriya, H, Tanaka, K, Niitsuma, H

    4th SEGJ International Symposium　1998/09

  72. Study of doublet/multiplet and its mechanisms using microseismicity in Soultz HDR field International-presentation

    Moriya, H, Oyamada, J, Asanuma, H, Niitsuma, H, Baria, R

    MTC Project meeting　1998/03/28

  73. Collapsing method for delineating original structure International-presentation

    Moriya, H, Ishimoto, M, Asanuma, H, Niitsuma, H, Jones, R

    MTC Project meeting　1998/03/28

  74. ソルツＨＤＲフィールドにおいて観測されたＡＥダブレットの解析

    小山田, 森谷, 新妻, R. Baria

    日本地熱学会平成9年度学術講演会　1997/10/07

  75. ウエーブレット変換による透過S波伝搬時間変化の高精度検出と人工地下き裂の性状評価

    田中, 森谷, 浅沼, 新妻

    物理探査学会第96回学術講演会論文集　1997/05/29

  76. Fracture mapping and characterization by relocation of multiplets in Clinton County oil field, Kentucky International-presentation

    Moriya, H, Rutledge, J. T, Niitsuma, H

    MTC Project meeting　1997/03/17

  77. Estimation of regional in-situ stress field controlling subsurface fracture system by using microseismic multiplets International-presentation

    Moriya, H, Rutledge, J. T, Niitsuma, H, Fehler, M

    International Symposium on Rock Stress　1996/10/09

  78. AEダブレットによる応力解析 －Regional Stress Fieldの計測は可能か？－

    森谷, 新妻

    資源・素材関係学協会合同秋季大会　1996/08/27

  79. ＡＥダブレットを用いた高精度マッピング法による超解像地下計測

    森谷, 新妻

    資源・素材’96　1996/08/27

  80. Subsurface stress field determination using multiplets in downhole three-component microseismic measurement International-presentation

    Moriya, H, Niitsuma, H

    2nd North American Rock Mechanics Symposium　1996/06

  81. Evaluation of fracture system in Clinton County oil field, KY, by using microseismic multiplets International-presentation

    Moriya, H, Rutledge, J. T, Niitsuma, H, Fehler, M

    Workshop on Induced Seismicity　1996/06

  82. Doublet analysis for characterizing regional subsurface structures in three-component microseismic measurement International-presentation

    Moriya, H, Niitsuma, H

    6th Conference on Acoustic Emission/Microseismic Activity in Geologic Structures and Materials　1996/06

  83. 人工地下き裂加圧にともなう透過弾性波伝搬時間変化の検出

    田中, 森谷, 浅沼, 新妻

    物理探査学会第95回学術講演会論文集　1996/05

  84. Identification of reservoir structure and stress state from hypocenter cloud in Ogachi HDR field, Japan, by using triaxial doublet analysis International-presentation

    Moriya, H, Niitsuma, H, Kaieda, H

    3rd International HDR Forum　1996/05

  85. Detection of micro shear-wave splitting in dilated micro crack zone by crosshole three-component seismic measurement International-presentation

    Moriya, H, Niitsuma, H

    3rd SEG/SEGJ International Symposium　1995/11

  86. 高透磁率トレーサによるき裂確認法（その9）－ＳＣＯＴ法による検層深度の自動補正－

    大里, 森谷, 新妻, 高杉

    物理探査学会第92回学術講演会論文集　1995/05

  87. 坑井傾斜計測と坑井間弾性波計測による東八幡平フィールド坑井の坑跡推定

    小林, 浅沼, 森谷, 新妻

    物理探査学会第92回学術講演会論文集　1995/05

  88. 3軸ＡＥダブレット解析および発震メカニズム解析に基づく地下き裂挙動評価法

    森谷, 新妻

    物理探査学会第90回学術講演会論文集　1994/10

  89. 3軸ダブレット解析に基づく地圧方向の推定

    森谷, 新妻

    物理探査学会第91回学術講演会論文集　1994/05

  90. 3軸ＡＥダブレット解析による地下き裂進展挙動の高精度推定

    森谷, 新妻

    物理探査学会第89回学術講演会論文集　1993/10

  91. 時間－周波数表現を用いた3軸ホドグラム解析によるＰ波到来時刻の高精度検出法

    森谷, 新妻

    物理探査学会第88回学術講演会論文集　1993/10

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Industrial Property Rights 2

  1. 外科手術におけるスクリュー挿入作成位置をリアルタイムで提供するシステム

    山田理顕, 森谷祐一

    特許6372784

    Property Type: Patent

  2. 物理量検出器及び物理量検出器の製造方法

    新妻弘明, 江刺正喜, 西澤充智, 浅沼宏, 森谷祐一, 鹿熊英昭, 高木義彦, 吉田勇作, 川添勝

    特許第4138372

    Property Type: Patent

Research Projects 34

  1. Measurement of fluid flow fracture system inside geothermal reservoir by using AE doublet Competitive

    1994/04 - Present

  2. Development and effect studies of educational program based financial statements to enhance the creativity for the undergraduate and graduate students in engineering

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2019/04 - 2022/03

  3. Expansion of slow slip microearthquake into the field of subsurface fluid energy utilization

    Moriya Hirokazu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2019/06 - 2021/03

    More details Close

    The seismic events, which were considered to be slow events, were detected by analyzing continuous waveform data measured in the Groningen gas field. Despite the depth of the earthquake source is thought to be around 3km-5km, events with a time duration around 30 seconds were included. When the source depth is about 3 km, the shear slip of the crack is generally several ms and the time duration of detected waveforms is several seconds general. Therefore, the event detected in this analysis seemed that the shear slip was more slowly than the normal AE. On the other hand, since the velocity structure of the field is composed of relatively low-velocity layers, it was found that detailed examination is required in consideration of such as the Q value.

  4. Development of hydraulic fracture evaluation by laboratory experiments and AE analysis

    Naoi Makoto, Moriya Hirokazu, Mukuhira Yusuke

    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: Kyoto University

    2016/04 - 2019/03

    More details Close

    We conducted hydraulic fracturing experiments in order to investigate the relationship between hydraulic fractures and induced microearthquakes. We monitored acoustic emissions during the experiments and compared the hypocenter distributions to fluid penetration regions that observed after the experiments. Fluid pressure history, fluid penetration region, acoustic emission activities, and their dominant mechanism significantly depended on the kind of rocks and dominant direction of preexisting fractures, revealing many important points that should be considered when estimating influence regions by microseismic activities.

  5. A Study on Prediction of Rock Failure Scale and its Timing by Observation of Acoustic Emission at Africa Deep Mine

    Moriya Hirokazu

    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

    2014/04 - 2018/03

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    We observed around 300 thousand of AE (Acoustic Emission) events by a high-resolution monitoring network close to the active front of a tabular mining stope being advanced northward at 1 km depth in the Cooke 4 Gold Mine in South Africa. The application of the double-difference relative location algorithm resolved seemingly continuous, dense cloud of AEs that extend about 20 m ahead of the stope front into several discrete, steeply dipping tabular clusters a few meters thick and 10-30 m in dip extent, separated by quiet intervals a few meters thick. The tabular clusters had a strike parallel to the stope face and a dip of around 65°, resembling commonly observed large shear fractures along the plane of maximum shear. These observations suggest that discrete tabular clusters of AEs represent macroscopically localized damage structures that formed in the highly stressed intact rock ahead of the stope face and may culminate in dynamic shear events.

  6. Science and Technology of Geothermal Energy Frontier

    TSUCHIYA Noriyoshi, ASANUMA Hiroshi, OKMOTO Atsushi, SAKAGUCHI Kiyotoshi, WATANABE Noriaki, HIRANO Nobuo, KIZAKI Akihisa, MORIYA Hirokazu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

    Category: Grant-in-Aid for Specially Promoted Research

    Institution: Tohoku University

    2013 - 2017

    More details Close

    Geological models and the properties of supercritical geothermal reservoirs are described with respect to supercritical geofluids, mechanical behaviors of reservoir rocks, crustal permeability and tectonic settings. Mechanical conditions at the elastic-plastic boundaries of granitic rocks indicate potentially exploitable supercritical geothermal resources. Tensile fracturing is possible even in ductile rocks, and some permeability-depth relations proposed for the continental crust show no drastic permeability reduction at the BDT (Brittle-Ductile Transition). The reservoir permeability (&gt;10^[-16] m^2) could be maintained even under supercritical conditions. The permeable-impermeable boundary of the crust and geothermal reservoirs were affected by water-rock interaction such as dissolution and precipitation of silica minerals. NE Japan is representative of an Island-Arc setting in a subduction system, and it is highly possible that exploitable supercritical geothermal resources may be located on and around the present volcanic front.

  7. Development of imaging system to avoid spinal cord injury risk by using ultrasound reflection method

    MORIYA HIROKAZU

    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

    2013/04 - 2016/03

    More details Close

    We have developed several different ultrasound sensors and carried out the experience using bone to confirm that it is possible to detect reflection wave from opposite surface of bone. We have investigated the reflection waves from the bottom of drilling hole, opposite surface of bone, multiple reflection between the bottom of drilling hole and sensor, and scattering waves. We have develop a filter to remove the signal induced by input pulse by using polynomial function. Three types of sensors with a center frequency of 3.5MHz, 10MHz and 15MHz were manufactured and used to detect the thickness of bone, and it has been confirmed that the sensor with a center frequency of 3.5MHz is better to detect the bone thickness from 1mm to 3mm. We are preparing for a document to obtain the patent of a monitoring system including ultrasound reflection method.

  8. Multidisciplinary monitoring of preparation and generation of earthquakes at M2 sources in South African gold mines

    OGASAWARA Hiroshi, NAKATANI Masao, YABE Yasuo, KAWAKATA Hironori, ISHII Hiroshi, NAKAO Shigeru, OKUBO Makoto, IDE Satoshi, IIO Yoshihisa, KANO Yasuyuki, KAME Nobuki, SATOH Takashi, LEI Xinglin, KATO Aitaro, IGARASHI Toshihiro, IMANISHI Kazutoshi, MORIYA Hirokazu

    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: Ritsumeikan University

    2009/05 - 2014/03

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    Drilling > 80 holes with a total length > 2.8 km in earthquake prone areas, conducted were multi-disciplinary studies at sites (at depths > 3km or with equivalent stress) at six South African gold mines in ever-larger scale. Microfracturing associated with a magnitude (M) 2 event as well as those in highly stressed rock mass at 1.0km depth at another mine were finely delineated and seismologically analyzed in ever-greater detail. A hole intersecting an M2 hypocenter allowed the constraint of stress. A technology was introduced that allowed to measure stress at ever-larger depths or in ever-larger magnitudes, which calibrated elastic stress modelling. Pre-seismic strain change was observed for a M0 event, which was one of the other outcomes that can be obtained only from our monitoring at the closest proximity of hypocenters.

  9. AE measurements in deep South African gold mines: Phase II - monitoring of rock mass damage by underground cavities and prediction of rockbursts

    NAKATANI Masao, MORIYA Hirokazu, LEI Xinglin, SATOH Takashi, OGASAWARA Hiroshi, KAWAKATA Hironori, YABE Yasuo, IDE Satoshi, IGARASHI Toshihiro, SANO Osamu

    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: The University of Tokyo

    2009/04 - 2014/03

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    A dense, 3-dimensional array of AE sensors with about 100-m spread was deployed in the rock mass near a mining stope at about 1-km depth in a South African gold mine. The area contained multiple geological faults. A huge number of microfractures were occurring almost exclusively either in the great proximity of fracture planes of geological faults or in the zone of high-differential stress ahead of the mining front. Relative abundance of small events was to a similar extent to natural earthquakes in the latter, but was extreme in the former. It has turned out that the latter population consists of several, discrete, large-scale (a few tens of meters), tabular clusters of a few meters thickness. Laboratory tests of rock samples from the mine showed that weak foliation affects the microfractures. Also, complexities of microfracture activity and the eventual through-going fracture were both shown to be affected by the orientation of the foliation with respect to the principal stress axis.

  10. 南アフリカ大深度金鉱山での地震被害低減のための観測研究 Competitive

    2009/04 - 2014/03

  11. Characterization of Subsurface 3-D Cracks for Advanced Geothermal

    HAYASHI Kazuo, ITO Shin, SEKINE Kotaro, MORIYA Hirokazu

    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

    2008 - 2010

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    In modern geothermal heat extraction, artificial fractures are usually introduced in order to produce geothermal heat more efficiently and more massively. The artificial cracks are predominantly large in sedimentary rocks. In the present report, we model the artificial crack as a 3-D crack filled with fluid. Then we studied the dynamic responses of the 3-D fluid filled cracks, such as size, location and conductivity. A new method is proposed to estimate the factors listed above. The applicability to field data was checked.

  12. Development of method for estimation of high permeable fractures and their distribution by using the multiplet-clustering analysis

    MORIYA Hirokazu

    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

    2008 - 2010

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    I have carried out the development of the method for estimation of high permeable fracture and their distribution in geothermal reservoir based on the multiplet-clustering analysis, where the analysis of induced AE data, comparison of results of AE data analysis and logging data analysis, and development of a parameter to identify high permeable fractures in reservoir were performed. In this study, I first have analyzed the induced microseismic AE multiplet by using the Weibull distribution to clarify the stochastic property of event occurrence, and shown that the occurrence of similar microseismic events (AE multiplet events)is quasi-periodic rather than random, and I inferred it to be related to the fluid flow rate in fractures. I have also suggested a parameter using event energy, injected fluid volume and time interval of event occurrence, and examined the feasibility of parameter using the induced microseismic events during a hydraulic stimulation at Soult field, France.

  13. Establishment of design methodology of EIMY : Experimental approach at Iwase Yumoto

    NIITSUMA Hiroaki, ASANUMA Hiroshi, MORIYA Hirokazu, ITO Takatoshi, MURAOKA Hirofumi, SOMA Nobukazu

    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

    2006 - 2008

  14. Development of the method for evaluation of subusurface fracture permeability by the multiplet-clustering analysis

    MORIYA Hirokazu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2006 - 2007

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    I have carried out the research for the development of the method to evaluate the permeability of sunsurface fracture. I have taken form the method for the evaluation of permeability. On the basis of the results which obtained through the research before, I have shown that it is possible to estimate the direction of fluid flow and the growing process of permeable fracture system by the time lapse distribution of source location determined by the multiplet-clustering analysis. I have also revealed that the pressure gradient as well as the critical pore-pressure of fractures during the hydraulic stimulation of geothermal reservoir can be estimated by the integration of the tectonic stress field and the fracture orientation and the time lapse distribution of AE source location, where I used the induced AE data at the Soultz HDR field in France. I have also shown that it is difficult to estimate the velocity of pressure propagation because the number of events is insufficient number and the source does not distribute all over the reservoir. On the other hand, I have demonstrated that the degree of fluid flow in the reservoir can be evaluated by refining the increasing rate of seismic moment release and the increasing rate of source area. The dynamic behavior of subsurface fracture was also examined, where the relationship between the frequency band for identifying similar microearthquakes (multiplet) and the structures delineated by the source location of multiplet. As the results, I have developed the procedure to evaluate the fracture permeability in the geothermal reservoir on the basis of the precisely determined source location by the multiplet-clustering analysis, and also revealed the restriction on the evaluation.

  15. Development of measurement method for high permeable fracture system by the multiplet-clustering analysis.

    MORIYA Hirokazu, NIITSUMA Hiroaki, ASANUMA Hiroshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2004 - 2005

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    In this research, we have examined the parameters for estimation of high permeable fracture by using induced AE multiplet, where the field data were analyzed and model experiment using granite rock specimen was also carried out in order to study the relation between the induced AE events and the permeable fractures. The relationships among AE occurrence, shear slip, flow rate and pressure in fracture has been investigated through the model experiments, where the shear slip was artificially induced using split rock specimen under the parameter controlled high stiffness system. On the other hand, the induced AE at Coper Basin in Australia and Soultz in France was analyzed and the relationships among the injection pressure, flow rate and AE occurrence were examined. The distribution of the critical pore-pressure for shear slip of fracture has been estimated at Soultz, and the pore-pressure propagation and the formation process of permeable fracture system has been examined. It has been revealed that the permeable fracture system in the reservoir is developed by the linkage of preexisting permeable fractures due to the shear slip of fractures which favorably oriented to the principal stress direction and easily caused shear slip. In addition, it has also been revealed that the pore-pressure spreads in few hundred meters in the reservoir without pressure drop and the pore-pressure exponentially declines as a function of distance from the outlet point in the injection well. On the basis of the above mentioned studies, we have proposed a measurement method for estimation of permeable fractures in reservoir by using the induced AE multiplets.

  16. AE ダブレットを用いた次世代型地熱貯留層の高度計測

    森谷祐一

    System: 産業技術助成事業

    Institution: NEDO

    2000/11 - 2003/03

  17. Characterization of subsurface artificial fracture by the TFC/3DTFC method

    ASANUMA Hiroshi, MORIYA Hirokazu, NIITSUMA Hiroaki

    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

    2001 - 2002

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    (a)Field Studies: Crosshole seismic measurement at Tohoku University Higashi-Hachimantai Field was carried out. Downhole airgun was used as a seismic source and signals transmitted through artificially pressurized fracture was recorded. The state of pressurization, location of source and detector were changed. (b)Analysis by the TFC/3DTFC method: The recorded signals in the field experiment were analyzed by the time-frequency coherency (TFC) and by the 3D-TFC methods. Some coherent components including direct arrivals, reflected phase and unknown coherent waves were discriminated. (c)Interpretation: Possible physics to generate coherent waves from pressurised fracture was investigated using theory of elastic wave. It has been concluded that leaky guided waves propagating along fracture is the most possible origin of detected coherent waves with lower velocity and highly correlated to pressurization.

  18. Development of four component optical interference micro accelerometer for dowohole seismic measurement

    NIITSUMA Hiroaki, MORIYA Hirokazu, ASANUMA Hiroshi, ESASHI Masayoshi

    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

    2001 - 2002

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    (a)Design of interference-type accelerometers: The frequency characteristics and sensitivity of the accelerometers were re-investigated and dimensions of the parts were decided. (b)Fabrication: We have designed a process chart for the microsensor and fabricated the sensor using facilities for micromechanical systems equiooed in VBL, Tohoku University. Morn than 10 sensors with expected interference pattern were fabricated. (c)Evaluation of the microsensors: The interference pattern, static characteristic and dynamic characteristics of the microsensors were evaluated in Lab. Then the sensors were mounted onto a metal-mount for 4C detector. Its static characteristics was investigated. (d)Field test: The 4C detector was set at the bottom of borehole in test site on campus. Artificial seismic signals from downhole airgun was detected by the 4C detector, and its in-situ performance was evaluated.

  19. 次世代型地熱貯留層計測のためのアサイスミックき裂のAE発震機構に関する研究

    森谷 祐一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究(B)

    Category: 若手研究(B)

    Institution: 東北大学

    2001 - 2002

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    本年度は,アサイスミックき裂で生じている物理現象の垂直応力依存性とせん断滑り速度依存性とについて,AE発生率ならびにm値を用いて具体的に検討し,地下のアサイスミックき裂でのAE発生挙動について考察した。 (A)き裂面から発生するAEの発生レート,m値の垂直応力依存性 高剛性の試験機を使用し変位制御によりSlide-Hold-Slide(定速度滑り-滑りを停止の後に一定時間保持-定速度滑り)試験を行った。既存き裂面に作用する垂直応力成分の大きさを変化させて,封圧が10から20MPaの環境下でせん断滑りの際に発生するAEを計測し,AE発生率(100〜500kHzの帯域で単位滑り量あたりのAE発生数)ならびにAE振幅のm値の変化を検討した。その結果,AE発生率とm値はき裂面に作用する垂直応力成分に依存しないことが分かった。本現象は,垂直応力が増加しても,き裂表面間の接触点数と接触面積に大きな変化がないためであると考えられる。 (B)き裂面から発生するAEの発生レート,m値の滑り速度依存性 同様の試験システムを用いて,せん断滑り速度を制御しながらその際に発生するAEを計測し,AE発生率ならびにm値の変化を検討した。その結果,AE発生率とm値はき裂面に作用するせん断滑り速度が増加すると,共に減少することが示された。追実験をする必要があるものの,このことは水圧破砕によりき裂内への流体流入度とともに間隙水圧上昇度が大きく,せん断滑り速度が比較的速いと考えられる既存き裂の場合,AEの発生率は低く,また相対的に振幅の大きなイベントが発生することを意味していると考えられる。 本研究で得られた成果は,地震学会ならびにスタンフォード地熱貯留層工学研究会で発表した。

  20. Investigation of behavior of engineered geothermal reservoirs by super-resolution mapping techniques

    NIITSUMA Hiroaki, MORIYA Hirokazu, ASANUMA Hiroshi

    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

    1999 - 2001

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    Geothermal energy is one of the most potential energy source in future, because it is widely distributed on the earth, safe, clean and environmentally friendly to the earth. Engineered geothermal systems, which includes hot dry rock (HDR), hot wet rock (HWR) and enhanced geothermal systems (EGS), are promising for electrical power generation in future. However, behavior of reservoirs associated with hydraulic fracturing has not been clearly understood, and hence this brings uncertainty/risk in the development of engineered geothermal systems. In this project, microseismic techniques for delineation of structures inside the microseismic cloud was investigated, then informations from microseismicity was combined with geological information and rock mechanics to interpret/understand physics in the reservoir. Major results from this project are, 1. Data sets collected at Soutls, Fenton-Hill, Rosemanowes, Ogachi, and Hijiori were re-analyzed by super-resolution mapping techniques. Location and orientation of microscopic seismic structures were estimated and their behavior (slip, stress conditions etc.) were also estimated. Variation of super-resolution mapping techniques was investigated to reduce uncertainty/error in mapping. 2. Relationship between seismic activity and geological information including location and orientation of preexisting fracture was investigated by tests in laboratory simulating a shear slip of fracture in granite.

  21. Development of a measurement techniques of coherent waves by a downhole double three compnent seismic detector

    ASANUMA Hiroshi, TATENO Masayuki, MORIYA Hirokazu, NIITSUMA Hiroaki

    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

    1999 - 2000

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    1.Application to super resolution mapping : We investigated a method to use crossvariance matrix from upper and lower detector in frequency domain for precise detection of polarization of P wave. It has been revealed that effect of uncorrelated noise is effectively suppressed by this method. 2.Application to AE reflection method : Software for three dimensional TFC method, where coherency of hodogrmas is evaluated, was developed. Reflectors at Kakkonda geothermal field was successfully imaged by this method. 3.Application to drill bit reflection method : The TFC method was used in the analysis existing data sets and the effectiveness of this method was investigated. 4.Application to cross hole measurement : Field experiments to detect coherent waves from pressurized fracture were made in Tohoku University Higashi Hachimantai Field, Iwate. Some coherent component appeared in the coherence index associated with water injection, although interpretation of origin and characteristics of thie wave has not done yet.

  22. Development of a method to estimate velocity structure using drill bits as a seismic source

    ASANUMA Hiroshi, MORIYA Hirokazu, NIITSUMA Hiroaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    1999 - 2000

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    1. Investigation on signal processing : We investigated a method to extract information on velocity structure from continuous drill signals. It has been revealed that velocity information can be extracted by analysis three dimensional hodograms in both time and frequency domains. 2. Investigation on inversion : We investigated a method to model velocity structure using information obtained by the techniques in 1. We have found that velocity structure consistent with real structure can be modeled by using a layerd model. 3. Evaluation of the method : Performance of the methods studied in 1 and 2 are eveluated by using real data sets collected at Soultz. Problem in processing and limitation of this method are examined and fed back to the developing phase 1 and 2.

  23. AEの超解像マッピング法に基づく地熱貯留層内高透水性き裂推定法の開発

    森谷 祐一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1999 - 2000

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    本年度の研究成果は以下のとおりである。 (A)実フィールドデータの解析と性能評価 今年度は、高透水性き裂位置を高精度に計測することを目的として、AEマルチプレットの超解像マッピング法にクラスタリング解析の概念を導入したMulutiplet Clustering Analysisを開発した。また、本方法を用いてソルツ(フランス)および雄勝HDR(高温岩体)発電実験フィールドにおける水圧破砕で計測されたAEの解析を行いその有効性を具体的に検討した。 ソルツフィールドでは、東西、南北、深度で1.5×1.2×1.5kmの範囲で約10000個のAEが発生し、おおよその貯留層サイズが推定されているが、ここでは、AEマルチプレット(波形が相互に類似したAE群)に着目した超解像マッピング法(AE源の高精度標定)、貯留層内き裂構造の推定を行った。その結果、AEマルチプレットは主応力方向に対してせん断すべりを起こしやすい既存き裂で発生し、個々のき裂サイズは3〜15mであり、さらに、それらのき裂群は、メッシュ状に分布していることが推定された。応力場、坑井内検層のデータによる透水き裂位置との対比により、本解析法で同定されたき裂構造面は、地熱貯留層内の流体流路として働いていると考えられる結果が得られ、本解析法により透水性き裂構造の計測が可能であることわかった。 一方、雄勝フィールドにおいても1992年水圧破砕時に計測されたAEマルチプレットの解析を行ない、本方法の有効性を検討した。その結果、深部(深度約1000m)および浅部(深度約700m)貯留層内のき裂構造面方向は、ともに北東であることが新たにわかった。 本研究では、具体的な解析法を考案するとともに実データの解析を通じてその有効性を示すことができ、おおむね当初の予定通りに遂行できた。これらの成果は、世界地熱会議、AE国際シンポジウム、日本地熱学会等で発表した。また、国際学術雑誌へ投稿し、掲載される予定である。

  24. Development of microsensors for subsurface microsensing

    NIITSUMA Hiroaki, MORIYA Hirokazu, ASANUMA Hiroshi, ESASHI Masayoshi

    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

    1997 - 2000

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    1. Development of silicon capacitive accelerometer : We fabricated silicon capacitive micro accelerometers with a size of 9mmX5mmX2mm. The accelerometer had sufficient response up to 1KHz. The sensor and electrical circuit were packaged into a micro sonde and tested in mini-field. 2. Development of optical accelerometer : A pure-passive optical accelerometer was fabricated. The sensor worked well at the frequency lower than 1kHz 3. Development of optical hydrophone : Optical hydrophones were fabricated. The hydrophone uses interference at the end of fiber. The hydrophone had ability to detect signals in a water tank 4. Fiber grating sensor : We investigated a method to create fiber Bragg grating on a fiber. A fiber sensor for a temperature compensation of a tidal wave detector was successfully fabricated with a resolution in the order of 0.001 degree-C. 5. Development of Radon sensor : Miniaturized radon sensor with a sintilator and cathode was fabricated at the end of optical fiber. This sensor had ability to detect alpha-ray from standard source.

  25. Discrimination of coherent waves by a downhole double three component seismic detector

    ASANUMA Hiroshi, MORIYA Hirokazu, NIITSUMA Hiroaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    1997 - 1998

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    (a) Development of double detector : We developed a downhole double three component detector using two three component detectors which have been designed and manufactured at Tohoku University. In-situ calibration the detector was carried out in Tohoku University Higashi-Hachimanatai Field. It has been revealed that the detector has a detectability of hodogram up to 200 Hz. (b) Investigation on signal processing : A method which enables coherence analysis of the three dimensional hodogram. A spectral-matrix-based method (3D-TFC) showed good potential for this purpose. (c) Field measurement : We carried out a field measurement of AE at Kakkonda Geothermal Field and recorded AE events with good quality. (d) Analysis of field data : Coherent phase, including direct arrival and reflected, in the AE events from Kakkonda were detected by the 3D-TFC method. The result was consistent with other geological information and reflection survey.

  26. 貯留層の動的挙動評価のためのAEマルチプレットを用いた地下応力場計測

    森谷 祐一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1997 - 1998

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    本年度の研究実績は以下の通りである。 (1) 応力場算出のため解析法の開発 マルチプレット震源分布より計測できる地下き裂構造面とその構造面の滑り方向から主応力を推定する方法を考案し,これを具体化した。構造面すべり方向は,モーメントテンソル解析をもとにしたグリッド法により,少数の3成分地震計の配置により推定できるようになった。逆解析法は,ボーリングコア中のスリッケンサイドを用いた応力計算法を導入したもので,ここでは,最大,中間,最小主応力方向,および最小主応力により正規化された最大主応力,中間主応力を算出することが出来る。これらの応力場は,き裂内の間隙水圧の関数として計算可能である。 (2) 実フィールドデータの解析 クリントン石油フィールドで計測されたAEに適用し,主応力方向ならびに主応力比を推定した。本結果は、AEの発震メカニズム解析で推定されている応力場とよい整合性が見られ,有効性が明らかになった。本成果は,国内学会において発表するとともに,国際雑誌への論文としてまとめている。今後は,国内外の高温岩体発電実験フィールドで計測されたAEの解析を行ない,応力場計測を行なうとともに,本方法についてさらに具体的な検討を行なう。

  27. Development of a Downhole Tri-axial magnetic field measuring system and its application to Subsurface Fracture Characterization

    SATO Motoyuki, EBIHARA Satoshi

    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

    1996 - 1998

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    This project was carried out in the three phases described below. (1) Hardware development of the downhole tri-axial magnetic field measuring system was carried out. The basis of the system is the downhole tool developed by the NEDO under MITT, Japan. Fundamental experiment in air and in a borehole at Tohoku University experiment site at Higashi Hachimantai Geothermal field was achieved for understanding the tool characteristics. Theoretical tool response was calculated and directivity to electrical conductivity of the surround material was examined. (2) Independent response of in-phase and quadrate - phase components was experimentally shown. Theoretical approach to the method of simultaneous electrical conductivity and magnetic permeability logging was studied. Also, we found this technique is sensitive to the thin layer detection and precise determination of geological boundary. (3) A Cross-hole tomography technique was tested by using a low frequency downhole tool. The system use 2MHz-32MHz, which are intermediate frequency of conventional borehole radar and induction technique. We could show that this technique can be used in relatively conducting material. Throughout this project, we showed experimentally and theoretically that the dowohole tri-axial magnetic field measuring system can be used for simultaneous electrical conductivity ad magnetic permeability logging, and that it is useful for characterization of subsurface fracture classification.

  28. NEW UNDERSTANDING OF GEOTHERMAL RESERVOIR BY ADVANCED MAPPING

    NIITSUMA Hiroaki, MORIYA Hirokazu, ASANUMA Hiroshi, FEHIER Michael, BARIA Roy

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for international Scientific Research

    Category: Grant-in-Aid for international Scientific Research

    Institution: Tohoku University

    1996 - 1997

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    1.Installation of a server : A data server was installed in Tohoku University for this Project. 2.Joint Experiment : Joint AE measurement experiment was carried out at Soultz HDR site in cooperation with Socomine. 3.Project Meetings : Three project meetings were held in Sendai in FY 97 and 98. 4.Multicomponent signal processing WG : (a) In-situ detectability of the 3D hodogram was examined by the SPM analysis, (b) A time-frequency coherency analysis using the double 3C detector was investigated, (c) Wavelet spectral matrix analysis was introduced into the AE reflection method, (d) The 3D triaxial drill-bit VSP was investigated, (e) Triaxial AE doublet analysis was applied to Soultz dataset. (f) A software to automatically clusterize AE doublets was developed. 5.AB Tomography WG : AE tomography method was applied to Soultz data set. 6.Sparse Network WG : The performance of the AE network at Soultz was quantitatively evaluated and application of drill-bit VSP,AE reflection method and doublet analysis was investigated. 7.De-blurred mapping WG : Information on fracture network and geologic structure was introduced to the de-blurred mapping. 8.AE mechanism WG : Existence of aseismic zone inside the reservoir was found out. Theoretical and experimental study on seismic/aseismic zones was carried out. Spatial and temporal distribution of the doublet were examined.

  29. ポラリメトリックボアホールレーダによる地中異方性媒質評価の研究

    佐藤 源之, 森谷 裕一, 浅沼 宏, 新妻 弘明, 中塚 勝人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(C)

    Category: 基盤研究(C)

    Institution: 東北大学

    1996 - 1996

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    (1)フィールド実験 基礎実験として、比較的損失が小さく校正に適している岩手県釜石鉱山内東北大学実験フィールドの花崗岩岩体中のボアホールにおいて2本の抗井間でのクロスホール計測を行った。ダイポール、スロット2種類のアンテナを送受信相互に組み合わせ、4通りの偏波状態のデータを取得しポラリメトリック解析による異方性評価のためのデータに使用した。 (2)異方性媒質物性計測 岩石サンプルからコアサンプルを整形し、実験室において精密な高周波電気特性を計測するための同軸管ホルダを設計し、製作した。 一方原位置においはTDR法による媒質簡易評価法について実験及びレーダ実験データの照合を行ったところ、良好な対応が確認できた。特に電磁波に対する不均質性と、レーダ計測での異方性との相関がみられた。 (3)レーダポラリメトリによる異方性評価法の開発 クロスホール計測で取得したデータより伝搬媒質の異方性評価を行った。開発した信号処理手法により、散乱行列の定量評価が可能となり、本研究においては散乱行列の性質と媒質の物性の対比から、散乱行列要素の対角要素と非対角要素の関係が異方性の重要な評価パラメータとなることを見いだした。

  30. 人工地熱貯留層性状評価のためのS波マイクロスプリティング現象の検出

    森谷 祐一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1996 - 1996

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    本年度の研究実績は、以下に示す通りである。 (1)東八幡平実験フィールドにおける計測実験 東八幡平実験フィールドにおいて、フィールド実験を実施した。ここでは、S波伝搬時間遅延と加圧時間、圧力との関係、人工地下き裂に対するS波の入射角度依存性を評価するための実験を行った。 (2)信号処理法の開発 S波マイクロスプリッティング検出のための信号処理法として、クロススペクトル解析法、およびウェーブレット変換を用いた方法の検討を行った。 (3)S波マイクロスプリッティング現象の解明 クロススペクトル解析により、 (a)S波伝搬時間遅延と加圧時間、圧力との関係を検出した。 (b)人工地下き裂に対するS波の入射角度と伝搬時間遅延との関係を検出した。 (4)マイクロクラックゾーン評価法の検討 (a)(3-a,b)の結果と単純なマイクロクラックゾーンモデルにより、S波伝搬速度低下率を与えることによりマイクロクラックゾーンの厚さの推定値を得られるようになった。 (b)き裂密度および配向方向を評価するために、透過後のS波偏波方向をウェーブレット変換による検出を試みた。本解析により偏波方向と伝搬時間遅延の関係が検出できれば、スプリッティング理論を導入することで、マイクロクラックゾーンおよびき裂密度の評価が可能であるとの見通しが立った。

  31. Characterization of deep geothermal reservoir by the AE reflection method

    NIITSUMA Hiroaki, MORIYA Hirokazu, ASANUMA Hiroshi, ABE Mamoru, SATO Motoyuki

    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

    1995 - 1996

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    (a) Field AE measurement : Two field AE measurement was made at Kakkonda Geothermal area, Japan. Downhole single/double point measurement was carried out and AE signals with sufficient quality for AE reflection method was recorded. (b) Detection of reflected waves : A theory to discriminate reflected waves from 3C AE signals was devised. Its performance was examined by simulations and optimum parameters in analysis was found. (c) Estimation of the 3D subsurface structure : An method for inversion of the detected reflected waves were devised based on deffraction migration method. (d) Analysis of field data : AE signals recorded at Kakkonda was analyzed by the new techniques derived throughout this research project. The estimated subsurface structure was compared with other geological information, including logging data, core information and surface survey. The reflection image in Kakkonda by the AE reflection method was considerably consistent with other information.

  32. ポラリメトリックボアホールレーダの偏波校正法に関する研究

    佐藤 源之, 森谷 祐一, 浅沼 宏, 阿部 司, 新妻 弘明

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 一般研究(C)

    Category: 一般研究(C)

    Institution: 東北大学

    1995 - 1995

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    1 地下き裂の反射偏波特性解析 ボアホールレーダでが計測対象とする地下き裂のモデル化を行い、FD-TDを利用した偏波特性シミュレーションを行った。現実的なき裂モデルとアンテナ配置では、非常に局所的な反射波の乱れが生じていることがわかった。また、き裂面からの交差偏波の発生を定量的に知ることができた。 2 校正法の開発 クロスホール計測で取得したデータより、アンテナ伝達特性を決定し、定量的な散乱行列要素を決定する方法を確立した。 3 フィールド実験 校正のために比較的損失が小さく校正に適していると考えられる岩手県釜石鉱山内に配置されている東北大学実験フィールドの花崗岩中ボアホールにおいて2本の坑井間での伝送量をはかるクロスホール計測を行った。実験でではダイポール、スロット2種類のアンテナを送受信相互に組み合わせ、4通りの偏波状態のデータを取得した。ダイポールとスロットを送受信で逆転させた場合、一致した波形が得られなかった。これは、計測がモノスタティックとみなすことができないことを示しており、ポラリメトリックデータの取り扱いをバイスタティック状態として正しく行う必要のあることが明らかとなった。これは、シミュレーション結果とも良く一致する。また、交差偏波の強度についてもシミュレーションとに定性的一致をみた。

  33. 貯留層の動的挙動評価のためのAEマルチプレットを用いた地下応力場計測 Competitive

    1994/04 -

  34. 坑井内計測によるAE 源の高精度位置標定に関する研究

    Offer Organization: 日本学術振興会

    Category: 特別研究員奨励費

    1992 - 1994

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Social Activities 5

  1. 国際教育交流協議会夏期研究集会委員

    2003/01 - Present

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    国際教育交流協議会夏期研究集会

  2. 東北大学工学部・工学研究科におけるチューター制度の運用

    2013/02/01 -

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    東北大学工学部・工学研究科におけるチューター制度の運用に関する講演

  3. 地中熱利用ヒートポンプシンポジウム（東京）

    2006/12/19 -

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    地中熱利用ヒートポンプに関する講演

  4. 地中熱利用ヒートポンプシンポジウム（大宮）

    2006/12/18 -

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    地中熱利用ヒートポンプに関する講演

  5. 平成15年度地熱学会仙台大会実行委員会委員

    2003/11/01 -

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    日本地熱学会仙台大会の実行

Other 8

  1. 南アフリカ地下3kmの鉱山における地震の計測と解析

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    南アフリカ地下3kmの鉱山における地震を震源近傍で計測し，解析を行うことで，地震の発生メカニズム等の解明を行う．

  2. 椎弓形成術における骨厚の超音波による計測

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    本研究では，湿潤状態で厚さが数ミリメートル以下の骨の場合，10 MHz程度の超音波でも骨内を透過することに着目し，反射法により骨厚をリアルタイム・高分解能で計測することを狙ったものである．整形外科臨床医，企業の協力を得て，椎弓形成術時の骨の穿孔や切削時における，脊柱管までの骨厚を簡便かつリアルタイムに計測する方法とシステムの開発を目指す．

  3. 環境調和型再生可能エネルギー「地熱」利用のためのAE・微小地震を用いた地下情報計測に関する研究

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    AE・微小地震震源の高精度標定法の開発を目的として行われたもので，ここでは，地震計ネットワークの3成分弾性波検出器により計測されたAE・微小地震信号を用いた震源位置高精度標定のための一連の多成分信号処理法が開発されている．

  4. AE・微小地震法による地圏環境計測に関する研究助成

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    幌延地区のAEマルチプレット解析に関する研究．

  5. 北海道幌延地区の地震観測データの解析

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    北海道幌延地区の地震観測データについてマルチプレット解析を行い，震源位置の高精度標定と地下構造の推定を行う．

  6. 地球環境システム計測に関する研究

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    地球内部の流体流動をAEにより推定する方法の研究

  7. AEダブレットを用いた次世代型地熱貯留層の高度計測

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    水圧破砕等により人工地熱貯留層を造成する際，地下き裂の進展に伴いAEが計測される。そのAEの中には波形が相互に類似したAEダブレット（マルチプレット）と呼ばれるAE群が多く見られる。本研究では，AEマルチプレットに着目し，それらの震源位置高精度標定法であるマルチプレット・クラスタリング解析法を開発し，本方法による地熱貯留層内高透水性地下き裂の高精度計測法を具体的に検討している。

  8. Measurement of fluid flow fracture system inside geothermal reservoir by using AE doublet

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    AEダブレットを用いた次世代型地熱貯留層の高度計測を行う．

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