Details of the Researcher

PHOTO

Yasuo Yabe
Section
Graduate School of Science
Job title
Associate Professor
Degree

  • 博士（理学）（東北大学）

  • 修士（理学）（東北大学）

Education 2

  • Tohoku University　Graduate School, Division of Natural Science　地球物理学

    - 1998/06/30

  • Tohoku University　Faculty of Science　地球物理学

    - 1993/03

Committee Memberships 13

  • 日本地球掘削科学コンソーシアム（J-DESC）　ICDP部会部会長補佐

    2024/05 - Present

  • 日本地球掘削科学コンソーシアム（J-DESC）　理事

    2024/05 - Present

  • J-DESC　会員提案型活動経費審査委員

    2016/07 - Present

  • J-DESC　ICDP部会執行部委員

    2016/04 - Present

  • 日本地震学会広報委員会　広報委員

    2010/05 - Present

  • 学術調査官

    2020/04 - 2022/03

  • 日本地震学会　代議員

    2010/05 - 2020/04

  • 東京大学地震研究所地震予知研究協議会予算委員会　委員長

    2015/04 - 2017/03

  • 東京大学地震研究所地震予知研究協議会「地震発生の素過程」計画推進部会　部会長

    2009/04 - 2013/03

  • 日本地震学会広報委員会　一般広報誌「なゐふる」編集長

    2008/04 - 2010/04

  • 日本地震学会「地震」編集委員会　編集委員

    2008/04 - 2010/03

  • 次期地震・火山噴火予知のための観測研究計画計画推進準備会　世話人

    2007/10 - 2009/03

  • 東京大学地震研究所地震予知研究協議会「地震発生の素過程」計画推進部会　部会委員

    2004/04 - 2009/03

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Professional Memberships 5

  • European Geosciences Union

  • Japanese Society for Rock Mechanics

  • Japan Geoscience Union

  • American Geophysical Union

  • 日本地震学会

Research Interests 11

  • rheology

  • AE method

  • AERA

  • DRA

  • core method

  • crustal stress

  • fault friction

  • frictional property

  • frictional sliding

  • rock experiment

  • acoustic emission

Research Areas 1

  • Natural sciences / Solid earth science /

Awards 3

  1. 平成27年度岩の力学連合会賞（フロンティア賞）

    2016/04/15　岩の力学連合会

  2. 日本地震学会論文賞

    2013/03/20　日本地震学会

  3. ISS seminar award 2nd prize

    2008/04/09　ISS

Papers 90

  1. Induced Earthquakes Inhibited by Shear Thickening Fluid

    Lu Wang, Yusuke mukuhira, Yasuo YABE, Sando Sawa, Jun Muto

    2025/07/28

    DOI： 10.22541/essoar.175370190.02133888/v1 　

  2. Identification of structures capable of hosting the ML 5.5 Orkney South Africa earthquake and factors controlling the physics and mechanics of dynamic rupture

    S.B. Mngadi, M.S.D. Manzi, N.Z. Nkosi, R.J. Durrheim, Jr.H. Ogasawara, Y. Yabe, DSeis team

    Journal of the Southern African Institute of Mining and Metallurgy　2025/02/28

    DOI： 10.17159/2411-9717/3445/2025 　

  3. From DSeis to PROTEA - Probing the heart of an earthquake, especially the interaction between metasedimentary rocks and mantle-derived intrusions. 

    Hiroshi Ogasawara, Yasuo Yabe, Raymond Durrheim, Musa Manzi, Thomas Kieft, Devan Nisson, Julio Castillo, Alba Gómez-Arias, Bennie Liebenberg, Team DSeis and PROTEA

    2025/01/20

    DOI： 10.5194/egusphere-egu24-14233 　

  4. Frictional properties of the fault hosting aftershocks of the 2014 Orkney earthquake (M5.5), South Africa, and proposal of a new drilling project PROTEA to probe the heart of the earthquake

    Yasuo Yabe, Hiroshi Ogasawara, Raymond Durrheim

    2025/01/20

    DOI： 10.5194/egusphere-egu24-3723 　

  5. Humidity dependence of AE activity in sheared quartz gouges and its implication for the micromechanics of friction

    Yasuo Yabe

    Earth, Planets and Space　2025/01/13

    DOI： 10.1186/s40623-024-02132-2 　

  6. Stable-to-dynamic expansion of fault slipping area through fluid injection observed in laboratory experiments using a sub-meter scale specimen

    Takatoshi Ito, Koji Aoki, Yusuke Mukuhira, Yasuo Yabe

    Earth, Planets and Space　76　(1)　2024/11/22

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-024-02092-7 　

    eISSN： 1880-5981

    More details Close

    Abstract In the field, locally applied fluid pressure can initiate fault slip, which may expand unstably over a wide area under certain conditions, generating elastic waves and inducing earthquakes. Therefore, examining the unstable expansion of the initial slip is important. However, reproducing this process in laboratory experiments, such as triaxial loading tests on small cylindrical specimens with inclined faults, is challenging. To achieve this, we prepared a sub-meter-scale cubic specimen, which was separated into two triangular prisms by a model fault. The specimen was subjected to biaxial compression of different magnitudes. A 2D array of strain gauges was embedded beneath the fault plane to measure the changes in shear strain with fault slip driven by fluid injection. Based on the experimental results, we discussed the features of the injection-induced fault slips that lead to earthquakes. The strain increased locally around the edge of the fault slipping area by approximately 10 με, which is equivalent to a shear stress of ~ 0.1 MPa. The fault slipping area first expanded gradually and then unstably beyond the fluid invasion area approximately 3 s after the slip was initiated. The unstable expansion of initial slips was suppressed by reducing the initial shear stress on the fault by 0.3 MPa. In this case, the initial shear stress was possibly too small for additional stress to accumulate at the edge of the fault-slipping area to overcome the static frictional strength of the fault. Our experimental study explicitly confirms that injection-induced aseismic slip can outpace the fluid migration front, finally leading up to a runaway rupture. It also confirms that the level of initial shear stress is important in controlling the rupture size under fluid injection. Graphical Abstract

  7. A Trial Evaluation of Rock Core DCDA Absolute Shear Stress Measurement for Routine Quantitative Mining Hazard Assessment in Deep Underground High Stress Mines Peer-reviewed

    Ogasawara, H, Y. Mima, A. Ishida, S. Mngadi, M. Higashi, Y. Yabe, A. Funato, T. Ito, M. Nakatani, R. Durrheim

    Material Transactions　65　817-823　2024/06

    DOI： 10.2320/matertrans.MT-Z2024004 　

  8. Frictional properties of rocks recovered form aftershock cloud of the 2014 Orkney earthquake (M5.5), South Africa, by ICDP-DSeis

    Yasuo YABE

    2023/12/10

    DOI： 10.22541/essoar.170224533.30395370/v1 　

  9. Characteristics of Fault Rocks Within the Aftershock Cloud of the 2014 Orkney Earthquake (M5.5) Beneath the Moab Khotsong Gold Mine, South Africa Peer-reviewed

    T. Miyamoto, T. Hirono, Y. Yokoyama, S. Kaneki, Y. Yamamoto, T. Ishikawa, A. Tsuchiyama, I. Katayama, Y. Yabe, M. Ziegler, R. J. Durrheim, H. Ogasawara

    Geophysical Research Letters　49　(14)　2022/07/15

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2022gl098745 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  10. Stress State in the Source Region of Mw2.2 Earthquake in a Deep Gold Mine in South Africa Determined from Borehole Cores Peer-reviewed

    Yasuo Yabe, Shuhei Abe, Gerhard Hofmann, Dave Roberts, Halil Yilmaz, Hiroshi Ogasawara, Takatoshi Ito, Akio Funato, Masao Nakatani, Makoto Naoi, Raymond Durrheim

    Pure and Applied Geophysics　179　(5)　1679-1700　2022/04/05

    DOI： 10.1007/s00024-022-02999-w 　

    ISSN： 0033-4553

    eISSN： 1420-9136

  11. Estimation of surface charge densities supporting seismo-electromagnetic phenomena through the surface charging mechanism Peer-reviewed

    Kiriha Tanaka, Hiroyuki Nagahama, Jun Muto, Toshitaka Oka, Yasuo Yabe

    Physics and Chemistry of the Earth, Parts A/B/C　103137-103137　2022/02

    Publisher: Elsevier BV

    DOI： 10.1016/j.pce.2022.103137 　

    ISSN： 1474-7065

  12. Effect of Fracture on ESR Intensity Using a Low-Velocity Rotary Shear Apparatus Peer-reviewed

    Kiriha Tanaka, Jun Muto, Yasuo Yabe, Toshitaka Oka, Hiroyuki Nagahama

    Geochronometria　48　(1)　2021/05/28

    Publisher: Walter de Gruyter GmbH

    DOI： 10.2478/geochr-2020-0035 　

    ISSN： 1733-8387

    eISSN： 1897-1695

  13. Slow Stick‐Slip Failure in Halite Gouge Caused by Brittle‐Plastic Fault Heterogeneity Peer-reviewed

    Ken‐ichi Hirauchi, Yoshiaki Yoshida, Yasuo Yabe, Jun Muto

    Geochemistry, Geophysics, Geosystems　21　(9)　2020/09

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2020gc009165 　

    ISSN： 1525-2027

    eISSN： 1525-2027

  14. 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　2020

    DOI： 10.1016/j.ijrmms.2020.104454 　

    ISSN： 1365-1609

  15. In-situ stress around source faults of seismic events in and beneath South African deep gold mines

    Yabe, Y, S. Abe, T. Ito, A. Ishida, K. Sugimura, M. Kanematsu, M. Higashi, R. Tadokoro, H. Ogasawara, A. Funato, H. Kato, B. Watson, S. Mngadi, R. Durrheim, G. Hofmann, L. Scheepers, S. Yoshida

    Proceedings of the 9th International Congress on Deep and High Stress Mining, Symposium Series S98, Southern African Institute of Mining and Metallurgy　399-411　2019/06

  16. 2019 status report: Drilling into seismogenic zones of M2.0–M5.5 earthquakes in South African gold mines (DSeis project)

    Ogasawara, H, B. Liebenberg, M. Rickenbacher, M. Ziegler, V.H. Esterhuizen, T.C. Onstott, R.J. Durrheim, M.S.D. Manzi, S. Mngadi, Y. Yabe, H.Y. Ogasawara, S. Kaneki, E. Cason, J.G. Vermeuren, E. an Heerden, T. Wiersberg, M. Zimmer, C. Kujawa, R. Conze, G. van Aswegen, N. Wechsler, A.K. Ward, S. Enslin, S. Tau, M.S. Bucibo, the DSeis Team

    Proceedings of the 9th International Congress on Deep and High Stress Mining, Symposium Series S98, Southern African Institute of Mining and Metallurgy　375-384　2019/06

  17. [Keynote lecture] Spatial variation in stress in seismogenic zones in South African gold mines

    Ogasawara, H, A. Ishida, K. Sugimura, Y. Yabe, S. Abe, T. Ito, A. Funato, H. Kato, B. Liebenberg, G. Hofmann, L. Scheepers, R. J. Durrheim, the SATREPS, DSeis teams

    Proceedings of the 2019 Rock Dynamics Summit in Okinawa, A specialized conference of ISRM　39-44-44　2019/05

    DOI： 10.1201/9780429327933-5 　

  18. 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

  19. 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　747-748　318-326　2018/11/13

    DOI： 10.1016/j.tecto.2018.10.014 　

    ISSN： 0040-1951

    eISSN： 1879-3266

  20. ICDP DSeis Project 南アフリカ金鉱山マグニチュード2〜5.5の地震発生場の掘削に成功！？

    小笠原宏, 矢部康男, 伊藤高敏, 廣野哲朗

    J-DESCニュースレター　9　14　2018/05

  21. Drilling into seismogenic zones of M2.0 – M5.5 earthquakes from deep South African gold mines (DSeis): establishment of research sites Peer-reviewed

    H. Ogasawara, R. J. Durrheim, Y. Yabe, T. Ito, G. van Aswegen, M. Grobbelaar, A. Funato, A. Ishida, H. Ogasawara, S. Mngadi, M. S.D. Manzi, M. Ziegler, A. K. Ward, G. Hofmann, P. Moyer, M. Boettcher, P. Dight, W. Ellsworth, B. Liebenberg, N. Wechsler, T. Onstott, N. Berset

    ISRM AfriRock - Rock Mechanics for Africa　2017-October　237-248　2017

  22. Estimate of the stress state of earthquake source region in a South African deep gold mining by diametrical core deformation analysis (DCDA)

    Shuhei ABE, Yasuo YABE, Takatoshi ITO, Masao NAKATANI, Gerhard, HOFMANN, Hiroshi OGASAWARA

    Proceedings of the 14th Symposium of Japan Rock Mechanics Society.　(講演番号107)　1-6　2017/01

  23. 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

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

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

    International Association of Geodesy Symposia　145　63-71　2017

    DOI： 10.1007/1345_2015_135 　

    ISSN： 0939-9585

  25. Acoustic emission monitoring for mitigating seismic risks in deep gold mines in South Africa Invited

    Naoi, M, M. Nakatani, H. Moriya, Y. Yabe

    Int. J. JSRM　12　(1)　19-22　2016/07/11

    Publisher: Japanese Society of Rock Mechanics

    DOI： 10.11187/ijjsrm.12.1_19 　

    More details Close

    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).

  26. Unexpectedly frequent occurrence of very small repeating earthquakes (-5.1 ≤ M<inf>w</inf> ≤ -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　2015/12/01

    DOI： 10.1002/2015JB012447 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  27. 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　2015/10/01

    DOI： 10.1016/j.ijrmms.2015.08.018 　

    ISSN： 1365-1609

    eISSN： 1873-4545

  28. Nucleation process of an M2 earthquake in a deep gold mine in South Africa inferred from on-fault foreshock activity Peer-reviewed

    Yasuo Yabe, Masao Nakatani, Makoto Naoi, Joachim Philipp, Christoph Janssen, Takayoshi Watanabe, Taishi Katsura, Hironori Kawakata, Dresen Georg, Hiroshi Ogasawara

    Journal of Geophysical Research: Solid Earth　120　(8)　5574-5594　2015/08/01

    DOI： 10.1002/2014JB011680 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  29. Steady activity of microfractures on geological faults loaded by mining stress 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 gasawara

    Tectonophysics　649　100-114　2015/05/09

    DOI： 10.1016/j.tecto.2015.02.025 　

    ISSN： 0040-1951

    eISSN： 1879-3266

  30. 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

  31. 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　2015/03/01

    DOI： 10.1002/2014JB011165 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  32. Observational studies of the rock mass response to mining in highly stressed gold mines in South Africa, Proceedings of 7th International Congress on Deep and High Stress Mining Peer-reviewed

    Ogasawara, H, 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. Nakao, M. Okubo, H. Ishii, A.V. Visser

    Proceedings of 7th International Congress on Deep and High Stress Mining　2014/09

  33. 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

  34. In-situ monitoring of rock mass response to mining in South African gold mines using the Ishii strainmeters Peer-reviewed

    Ogasawara, H, T. Katsura, G. Hofmann, Y. Yabe, M. Nakatani, M. Naoi, H. Ishii, D. Roberts, S. Nakao, M. Okubo, J. Wienand, P. Lenegan, A.K. Ward

    Proceedings of the Sixth South African Rock Engineering Symposium 2014　2014/05

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

    Durrheim, R.J, 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

    Proceedings of the Sixth South African Rock Engineering Symposium 2014　2014/05

  36. In situ stress measurement at earthquake prone areas in South African gold mines Peer-reviewed

    Ogasawara, H, H. Kato, G. Hofmann, D. Roberts, T. Clements, P. Piper, Y. Yabe

    Proceedings of the Sixth South African Rock Engineering Symposium 2014　2014/05

  37. 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

  38. Frequency–Magnitude Distribution of −3.7 ≤ M <inf> W</inf> ≤ 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

    DOI： 10.1007/s00024-013-0721-7 　

    ISSN： 0033-4553

    eISSN： 1420-9136

  39. BX CCBO in-situ stress measurements at earthquake prone areas in South African gold mines -a summary of mini-workshop on 13 Feb 2014 Peer-reviewed

    H. Ogasawara, H. Kato, G. Hofhann, D. Roberts, P. Piper, T. Clements, A. K. Ward, Y. Yabe, H. Yilmaz, R. J. Durrheim

    48th US Rock Mechanics / Geomechanics Symposium 2014　2　924-934　2014

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

    Ogasawara, H, G. Hofmann, H. Kato, M. Nakatani, M. Naoi, Y. Yabe, R. Durrheim, A. Cichowicz, T. Kgarume, A. Milev, O. Murakami, T. Satoh, H. Kawakata

    8th International Symposium on Rockburst and Seismicity in Mines　2013/09

  41. Quasi-static fault growth in a gabbro sample retrieved from a South African deep gold mine revealed by multi-channel AE monitoring Peer-reviewed

    Satoh, T, X. Lei, M. Nakatani, Y. Yabe, M. Naoi, G. Morema

    8th International Symposium on Rockburst and Seismicity in Mines　2013/09

  42. Estimation of the stress state around the fault source of a Mw 2.2 earthquake in a deep gold mine in South Africa based on borehole breakout and core discing

    Yabe, Y, M. Nakatani, M. Naoi, T. Iida, T. Satoh, R. Durrheim, G. Hofmann, D. Roberts, H. Yilmaz, G. Morema, H. Ogasawara

    Proceedings for 6th International Symposium on In-Situ Rock Stress　2013/08

  43. In-situ Stress Measurements in and around Active Faults in Central Japan and Implications on a Recovery of Fault Strength during an Earthquake Recurrence Period

    Omura, K, F. Yamashita, Y. Yabe

    Proceedings for 6th International Symposium on In-Situ Rock Stress　2013/08

  44. Detection of mining-induced fractures associated with stress perturbation around a stope at the Cooke 4 gold mine, South Africa, by using AE events

    Moriya, H, M. Naoi, M. Nakatani, O. Murakami, T. Kgarume, A. K. Ward, R.J. Durrheim, J. Philipp, Y. Yabe, H. Kawakata, H. Ogasawara

    Proceedings for 6th International Symposium on In-Situ Rock Stress　2013/08

  45. 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

  46. 南アフリカ金鉱山大深度における震源近傍での現位置多点応力測定の可能性 Peer-reviewed

    小笠原宏, 加藤春實, Gerhard Hofmann, 矢部康男, 坂口清敏

    月刊地球　2013/03

  47. Application of vector-type super computer to understanding giant earthquakes and aftershocks on subduction plate boundaries Peer-reviewed

    Keisuke Ariyoshi, Toru Matsuzawa, Yasuo Yabe, Naoyuki Kato, Ryota Hino, Akira Hasegawa, Yoshiyuki Kaneda

    Sustained Simulation Performance 2012 - Proceedings of the Joint Workshop on High Performance Computing on Vector Systems, and Workshop on Sustained Simulation Performance　67-80　2013

    DOI： 10.1007/978-3-642-32454-3-6 　

  48. 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

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

    Moriya, H, M. Naoi, M. Nakatani, O. Murakami, T. Kgarume, A. K. Ward, R. Durrheim, J. Philipp, Y. Yabe, H. Kawakata, H. Ogasawara

    Proc. 21th Int. Acoustic Emission Sym., Jap. Soc. for Non-Destructive Inspection　2012/11

  50. Strain anomalies induced by the 2011 tohoku earthquake (m<inf>w</inf> 9.0) as observed by a dense gps network in northeastern japan Peer-reviewed

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

    Earth, Planets and Space　64　(12)　1231-1238　2012

    DOI： 10.5047/eps.2012.05.015 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  51. Establishment of SATREPS experimental sites in South African gold mines to monitor phenomena associated with earthquake nucleation and rupture Peer-reviewed

    Durrheim, R, H. Ogasawara, M. Nakatani, Y. Yabe, H. Kawakata, M. Naoi, A.K. Ward, S.K. Murphy, J. Wienand, P. Lenegan, A.M. Milev, O. Murakami, N. Yoshimitsu, T. Kgarume, A. Cichowicz, the SATREPS, research group

    Deep Mining 2012　2012

  52. Source Parameters of Picoseismicity Recorded at Mponeng Deep Gold Mine, South Africa: Implications for Scaling Relations Peer-reviewed

    G. Kwiatek, K. Plenkers, G. Dresen

    BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA　101　(6)　2592-2608　2011/12

    DOI： 10.1785/0120110094 　

    ISSN： 0037-1106

    eISSN： 1943-3573

  53. Twenty thousand aftershocks of a very small (M 2) earthquake and their relation to the mainshock rupture and geological structures Peer-reviewed

    Makoto Naoi, Masao Nakatani, Yasuo Yabe, Grzegorz Kwiatek, Toshihiro Igarashi, Katrin Plenkers

    Bulletin of the Seismological Society of America　101　(5)　2399-2407　2011/10/01

    DOI： 10.1785/0120100346 　

    ISSN： 0037-1106

    eISSN： 1943-3573

  54. 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

  55. In-situ stress at a site close proximity to the Gofukuji Fault, central Japan, measured using drilling cores Peer-reviewed

    Yasuo Yabe, Kentaro Omura

    ISLAND ARC　20　(2)　160-173　2011/06

    DOI： 10.1111/j.1440-1738.2010.00756.x 　

    ISSN： 1038-4871

  56. Frequency-magnitude characteristics down to magnitude -4.4 for induced seismicity recorded at Mponeng Gold Mine, South Africa Peer-reviewed

    G. Kwiatek, K. Plenkers, M. Nakatani, Y. Yabe, G. Dresen, JAGUARS-Group

    Bulletin of the Seismological Society of America　100　(3)　1165-1173　2010/06/01

    DOI： 10.1785/0120090277 　

    ISSN： 0037-1106

  57. Comparison of stress state around the Atera fault, central Japan, estimated using boring core samples and by improved hydraulic fracture tests Peer-reviewed

    Yasuo Yabe, Kiyohiko Yamamoto, Namiko Sato, Kentaro Omura

    Earth, Planets and Space　62　(3)　257-268　2010

    DOI： 10.5047/eps.2009.12.002 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  58. 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

    11th SAGA Biennial Technical Meeting and Exhibition　2009/09/16

  59. 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

    Southern African Institute of Mining and Metallurgy, Hard Rock Safe Safety Conference　115-134　2009/09

    Publisher:

  60. Character of slip and stress due to interaction between fault segments along the dip direction of a subduction zone Peer-reviewed

    Keisuke Ariyoshi, Toru Matsuzawa, Yasuo Yabe, Naoyuki Kato, Ryota Hino, Akira Hasegawa, Yoshiyuki Kaneda

    Journal of Geodynamics　48　(2)　55-67　2009/08

    DOI： 10.1016/j.jog.2009.06.001 　

    ISSN： 0264-3707

  61. Semi-controlled Earthquake-generation Experiments in Deep Gold Mines, South Africa &mdash; Monitoring at Closest Proximity to Elucidate Seismogenic Process &mdash;

    OGASAWARA Hiroshi, KAWAKATA Hironori, ISHII Hiroshi, NAKATANI Masao, YABE Yasuo, IIO Yoshihisa, The Research Group for the Semi-controlled Earthquake-generation Experiments at Deep Gold Mines South Africa (SeeSA)

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.)　61　(0)　563-573　2009

    Publisher: SEISMOLOGICAL SOCIETY OF JAPAN

    DOI： 10.4294/zisin.61.563 　

    ISSN： 0037-1114

    More details Close

    Experimental sites with potential earthquakes up to M &sim; 3 in coming few years are known beforehand from mining schedule at 2-3 km depths in South African gold mines, which allows us to deploy various borehole instruments including Ishii strainmeters, geophones, accelerometers and AE sensors. Deployment of these wide-dynamic-range and high-resolution observations in the past 15 years has led to many findings about the earthquake rupture and its preparation stage. High-sampling seismograms obtained at close proximity of M > 1 earthquakes have demonstrated similarities of these earthquakes to natural, greater earthquakes in many aspects, including stress drop, energy efficiency, and complexity of rupture propagation. Some of larger mine earthquakes are preceded by perceivable abnormal seismicity. However, no immediate precursors for earthquakes with M &sim; 2 were observed by our high-resolution strain and AE sensors installed within the dimension of mainshock rupture. In contrast, aseismic strain-step events that we had recently discovered were sometimes preceded by further slower forerunners. Ongoing projects bring in novel technologies such as field-scale AE monitoring and fast-response strainmeters, and novel targets including mines being flooded for closing operation.

  62. Observation of numerous aftershocks of an M-w 1.9 earthquake with an AE network installed in a deep gold mine in South Africa Peer-reviewed

    Yasuo Yabe, Joachim Philipp, Masao Nakatani, Gilbert Morema, Makoto Naoi, Hironori Kawakata, Toshihiro Igarashi, Georg Dresen, Hiroshi Ogasawara

    EARTH PLANETS AND SPACE　61　(10)　E49-E52　2009

    DOI： 10.1186/BF03352963 　

    ISSN： 1880-5981

  63. Evolution of source characteristics of AE events during frictional sliding Peer-reviewed

    Yasuo Yabe

    Earth, Planets and Space　60　(6)　2008

    ISSN： 1343-8832

    eISSN： 1880-5981

  64. Evolution of source characteristics of AE events during frictional sliding Peer-reviewed

    Yasuo Yabe

    EARTH PLANETS AND SPACE　60　(12)　E5-E8　2008

    DOI： 10.1186/BF03353113 　

    ISSN： 1880-5981

  65. In-situ stress at the northern portion of the Chelungpu fault, Taiwan, estimated on boring cores recovered from a 2-km-deep hole of TCDP Peer-reviewed

    Yasuo Yabe, Sheng Rong Song, Chien Ying Wang

    Earth, Planets and Space　60　(8)　809-819　2008

    DOI： 10.1186/BF03352832 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  66. Interaction between Fault Segments on a Subducting Plate Interface

    ARIYOSHI Keisuke, MATSUZAWA Toru, YABE Yasuo, HASEGAWA Akira, KATO Naoyuki

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.)　59　(4)　309-324　2007/03/25

    Publisher: SEISMOLOGICAL SOCIETY OF JAPAN

    DOI： 10.4294/zisin.59.309 　

    ISSN： 0037-1114

    More details Close

    A two-dimensional (2D) numerical simulation of seismic cycles on the plate boundary in a subduction zone is performed based on a rate- and state-dependent friction law to obtain insight into complicated cycle of interplate earthquakes off Miyagi Prefecture and to investigate possible precursory sliding behavior. Assuming that the complexity of seismic cycle such as the off Miyagi Prefecture Earthquake is mainly due to the heterogeneity of frictional properties, we divide the plate boundary into five segments along dip direction: three frictionally stable segments and two (shallower and deeper) seismogenic segments are placed alternately. From many trial simulation results, we find that the frictional parameters (b-a)and dc in the deeper seismogenic segment should be smaller than those in the shallower segment in order to generate earthquakes in the deeper segment more frequently than in the shallower segment. The simulation results show that preseismic, coseismic, and postseismic slip in a seismogenic segment tends to become larger when it occurs just after the earthquake in the other seismogenic segment, because the previous earthquake in the other seismogenic segment keeps on forward slip through the intermediate aseismic segment. We also find that the stress rate in the down-dip direction in the vicinity of the lower edge of the deeper seismogenic segment is compressional for the period of about one year prior to the occurrence of the earthquake in the segment while it is tensional prior to the event in the shallower segment. This result suggests that seismic activity change in a slab can be a clue to the intermediate-term prediction of large interplate earthquakes.

  67. High-resolution aftershock observations in the source region of the 2004 mid-Niigata Prefecture Earthquake Peer-reviewed

    Aitaro Kato, Masakatsu Arao, Keisuke Ariyoshi, Youichi Asano, Keiji Doi, Bogdan Enescu, Shinya Fujieda, Hiroko Hagiwara, Toshio Haneda, Akira Hasegawa, Shin'ichi Hashimoto, Satoshi Hirahara, Naoshi Hirata, Yasuhiro Hirata, Issei Hirose, Shusaku Hondo, Kumiko Hori, Shuichiro Hori, Shigeki Horiuchi, Toshihiko Igarashi, Takashi Iidaka, Yoshihisa Iio, Ryoya Ikuta, Takeo Ito, Takaya Iwasaki, Aya Kamimura, Toshihiko Kanazawa, Yasuyuki Kano, Hiroshi Katao, Satoshi Kawamoto, Tomonori Kawamura, Saeko Kita, Masaru Kobayashi, Yuhki Kohno, Toshio Kono, Masahiro Kosuga, Atsuki Kubo, Eiji Kurashimo, Satoshi Matsumoto, Takeshi Matsushima, Toru Matsuzawa, Noa Mitsui, Reiko Miura, Masatoshi Miyazawa, Tomoko Mizukami, Satoko Murotani, Satoru Nagai, Junichi Nakajima, Takashi Nakayama, Hiroaki Negishi, Kinya Nishigami, Izumi Ogino, Shiro Ohmi, Tomomi Okada, Hiroki Onaha, Shantha S.N. Gamage, Mamoru Saka, Shin'ichi Sakai, Katsuhito Sato, Toshiya Sato, Masato Serizawa, Takuo Shibutani, Junpei Shimizu, Junichi Suganomata, Kiyoko Tagami, Keisuke Takahashi, Kaori Takai, Fumiaki Takeuchi, Yasuda Takumi, Kazuo Tanaka, Ken'ichi Tatsumi, Takashi Tonegawa, Hiroaki Tsushima, Naoki Uchida, Kenji Uehira, Tomotake Ueno, Norihito Umino, Hiroo Wada, Kazutoshi Watanabe, Shigeru Watanabe, Yasuo Yabe, Tadashi Yaginuma, Mamoru Yamada, Shunroku Yamamoto, Yoshiko Yamanaka, Futoshi Yamashita, Fumihito Yamazaki, Satoshi Yui, Yohei Yukutake

    Earth, Planets and Space　59　(8)　923-928　2007

    DOI： 10.1186/BF03352030 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  68. On "the Weak Fault" and "the Optimal Plane" in Anisotropic Fracture Zone

    YABE Yasuo

    Zisin : Journal of the Seismological Society of Japan　58　(4)　407-409　2006/03/31

    Publisher:

    DOI： 10.4294/zisin1948.58.4_407 　

    ISSN： 0037-1114

  69. State of crustal stress in NE Japan estimated from boring core samples

    YABE Yasuo

    Spatial and Temporal Fluctuations in the Solid Earth -Clue to the Futrure of Our Planet-　156-157　2005/07/22

  70. Estimating the stress state around Chelungpu fault

    YABE Yasuo

    TCDP special sections in 2005 Annual meeting of geological society located in Taipei　35　2005/05/19

  71. Aftershock distribution and 3D seismic velocity structure in and around the focal area of the 2004 mid Niigata prefecture earthquake obtained by applying double-difference tomography to dense temporary seismic network data Peer-reviewed

    T. Okada, N. Umino, T. Matsuzawa, J. Nakajima, N. Uchida, T. Nakayama, S. Hirahara, T. Sato, S. Hori, T. Kono, Y. Yabe, K. Ariyoshi, S. Gamage, J. Shimizu, J. Suganomata, S. Kita, S. Yui, M. Arao, S. Hondo, T. Mizukami, H. Tsushima, T. Yaginuma, A. Hasegawa, Y. Asano, H. Zhang, C. Thurber

    Earth, Planets and Space　57　(5)　435-440　2005

    DOI： 10.1186/BF03351830 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  72. Aftershock distribution and 3D seismic velocity structure in and around the focal area of the 2004 mid Niigata prefecture earthquake obtained by applying double-difference tomography to dense temporary seismic network data Peer-reviewed

    T Okada, N Umino, T Matsuzawa, J Nakajima, N Uchida, T Nakayama, S Hirahara, T Sato, S Hori, T Kono, Y Yabe, K Ariyoshi, S Gamage, J Shimizu, J Suganomata, S Kita, S Yui, M Arao, S Hondo, T Mizukami, H Tsushima, T Yaginuma, A Hasegawa, Y Asano, H Zhang, C Thurber

    EARTH PLANETS AND SPACE　57　(5)　435-440　2005

    DOI： 10.1186/BF03351830 　

    ISSN： 1880-5981

  73. A preliminary report on state of crustal stress across northeastern Japan arc

    YABE Yasuo, SATO Namiko, YAMAMOTO Kiyohiko

    Proceedings of 2nd International Workshop on WATER DYNAMICS　171-174　2004/11/11

  74. A Proposal of New Interpretation of Spatio-temporal Variation in Seismicity and its Application to Plate Interface East off NE Japan

    YABE Yasuo

    Zisin : Journal of the Seismological Society of Japan　56　(4)　485-495　2004/03/25

    Publisher:

    DOI： 10.4294/zisin1948.56.4_485 　

    ISSN： 0037-1114

  75. Driving Force of the Intra-plate Crust as Inferred from the Stresses Measured in the Eastern Part of Kitakami Mountains, Northeastern Honshu, Japan

    YAMAMOTO Kiyohiko, SATO Namiko, YABE Yasuo

    Zisin : Journal of the Seismological Society of Japan　56　(4)　511-527　2004/03/25

    Publisher:

    DOI： 10.4294/zisin1948.56.4_511 　

    ISSN： 0037-1114

  76. Hypocenter and Focal Mechanism Distributions of Aftershocks of July 26, 2003, M 6.4 Northern Miyagi Earthquake Revealed by Temporary Observations

    UMINO Norihito, OKADA Tomomi, NAKAJIMA Junichi, HORI Shuichiro, KONO Toshio, NAKAYAMA Takashi, UCHIDA Naoki, SHIMIZU Junpei, SUGANOMATA Junichi, SHANTHA Gamage, NIDA Kouichi, YABE Yasuo, SAKODA Koji, SATO Namiko, ITO Minoru, HASEGAWA Akira, ASANO Youichi, HASEMI Akiko, DEMACHI Tomotsugu, YAJIMA Yoshinori

    Zisin : Journal of the Seismological Society of Japan　56　(4)　425-434　2004/03/25

    Publisher:

    DOI： 10.4294/zisin1948.56.4_425 　

    ISSN： 0037-1114

  77. In situ Stresses Near the Nojima Fault Estimated by Deformation Rate Analysis

    SATO Namiko, YABE Yasuo, YAMAMOTO Kiyohiko, ITO Hisao

    Zisin : Journal of the Seismological Society of Japan　56　(2)　157-169　2003/09/16

    Publisher:

    DOI： 10.4294/zisin1948.56.2_157 　

    ISSN： 0037-1114

  78. Effect of sliding rate on the activity of acoustic emission during stable sliding Peer-reviewed

    Yasuo Yabe, Naoyuki Kato, Kiyohiko Yamamoto, Tomowo Hirasawa

    Pure and Applied Geophysics　160　(7)　1163-1189　2003/07

    DOI： 10.1007/s000240300000 　

    ISSN： 0033-4553

  79. Frictional property of plate interface east off NE Japan inferred from spatial variation in b-value Invited Peer-reviewed

    YABE Yasuo

    Bullitine of Earthquake Research Institute　78　(1)　107-111　2003/03

    Publisher:

    ISSN： 0040-8972

  80. Rate dependence of AE activity during frictional sliding Peer-reviewed

    Yasuo Yabe

    Geophysical Research Letters　29　(10)　26-1　2002/05/15

    DOI： 10.1029/2001GL014369 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  81. Elastic property of damaged zone inferred from in-situ stresses and its role on the shear strength of faults Peer-reviewed

    Kiyohiko Yamamoto, Namiko Sato, Yasuo Yabe

    Earth, Planets and Space　54　(11)　1181-1194　2002

    DOI： 10.1186/BF03353319 　

    ISSN： 1880-5981

  82. Elastic property of damaged zone inferred from in-situ stress near fault: The changes in seismic wave velocities caused by faulting Invited

    YAMAMOTO Kiyohiko, SATO Namiko, YABE Yasuo

    International workshop on Physics of Active Fault　S4-1　2002/01

  83. Elastic property of damaged zone inferred from in-situ stresses and its role on the shear strength of faults Peer-reviewed

    K Yamamoto, N Sato, Y Yabe

    EARTH PLANETS AND SPACE　54　(11)　1181-1194　2002

    DOI： 10.1186/BF03353319 　

    ISSN： 1343-8832

  84. Strength of fault as inferred from the stresses measured in the vicinity of the Nojima Fault (Extended abstract) Invited Peer-reviewed

    YAMAMOTO Kiyohiko, SATO Namiko, YABE Yasuo

    Tohoku Geophysical Journal, Science Reports, Tohoku University, Series 5, Geophysics　36　272-290　2001/03

  85. Stresses at sites close to the Nojima Fault measured from core samples Peer-reviewed

    K. Yamamoto, Y. Yabe

    Island Arc　10　(3-4)　266-281　2001

    DOI： 10.1111/j.1440-1738.2001.00325.x 　

    ISSN： 1038-4871

  86. Stress state around the Nojima fault estimated by core measurements

    YAMAMOTO Kiyohiko, SATO Namiko, YABE Yasuo

    Proc. Int. W/S on the Nojima fault core and borehole data analysis, eds. H. Ito, H. Tanaka, & D. Lockner, GSJ Interim Rep. EQ/001/USGS Open-file Rep. 00-129　236-246　1999/03

  87. プレート境界地震の発生予測

    山本清彦, 三品正明, 三浦哲, 矢部康男

    月刊地球　号外20　(20)　81-84　1998/10

    Publisher:

    ISSN： 0916-9733

  88. 摩擦すべりに伴う微小破壊のすべり速度・法線応力依存性

    矢部康男

    月刊地球　20　(9)　550-553　1998/09

    Publisher:

    ISSN： 0387-3498

  89. Relation of in-situ stress field to seismic activity as inferred from the stresses measured on core samples Invited

    K Yamamoto, Y Yabe, H Yamamoto

    ROCK STRESS　375-380　1997

  90. GPS Observation in South West Hokkaido, Japan After the Occurence of the 1993 Hokkaido Nansei-oki Earthquake

    NAKAO Shigeru, othe

    Proceedings of CRCM 93　229　1993/03

Show all ︎Show first 5

Misc. 45

  1. A Trial Evaluation of Rock Core DCDA Absolute Differential Stress Measurement for Routine Quantitative Mining Hazard Assessment in Deep Underground High Stress Mines

    OGASAWARA Hiroshi, MIMA Yoshihiro, ISHIDA Akimasa, MNGADI Siyanda, HIGASHI Mitsuya, YABE Yasuo, FUNATO Akio, ITO Takatoshi, NAKATANI Masao, DURRHEIM Raymond

    Journal of the Society of Materials Science, Japan　71　(3)　259-264　2022/03/15

    Publisher: The Society of Materials Science, Japan

    DOI： 10.2472/jsms.71.259 　

    ISSN： 0514-5163

    eISSN： 1880-7488

    More details Close

    It is difficult to mine-widely, routinely measure absolute stress in the highly stressed rock mass in deep mines in the world because the drilled holes or cores are damaged during and immediately following the drilling. We evaluate the use of the Diametrical Core Deformation Analysis (DCDA) method, developed by Funato and Ito. The method can evaluate non-destructively the absolute differential stresses and measurement errors in the planes orthogonal to the core axes by precisely measuring the ellipticity of the core section orthogonal to the borehole axis. The five readings required to evaluate a single core take only about ten minutes to make. The measurement system is compact enough for a single regular courier parcel or flight check-in luggage. Absolute differential stresses were determined for thirty-five core samples from fourteen holes in different directions in the highly stressed rock mass in a South African gold mine. We were able to constrain an average 3D differential stress field, consistent with the 3D stress field measured in-situ with an overcoring method, with the maximum principal stress larger than 100 MPa, with a root mean square of residuals of several MPa. Interestingly, the results represent relaxation in shear stress near the fault intersected by the boreholes. The measurements require a core diameter larger than ca. 40 mm, and a core is longer than ca. 10 cm. The method assumes that there is no significant inelastic deformation and that the rock is isotropic.

  2. Normal stress dependency of ESR characteristic in quartz gouge by fault frictional sliding at shallow depth

    Tanaka Kiriha, Muto Jun, Yabe Yasuo, Oka Toshitaka, Nagahama Hiroyuki

    Annual Meeting of the Geological Society of Japan　2019　503　2019

    Publisher: The Geological Society of Japan

    DOI： 10.14863/geosocabst.2019.0_503 　

    ISSN： 1348-3935

    eISSN： 2187-6665

  3. 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

  4. 南アフリカ金鉱山M2-5.5地震発生場掘削ICDPワークショップ報告

    小笠原宏, 矢部康男, 伊藤高敏, ワークショップ参加者

    J-DESCニュースレター　(9)　14　2016/04

  5. 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

  6. 南アフリカ金鉱山地表下1kmにおける薄板状鉱脈の採掘で誘発されるアコースティック・エミッションの観測

    直井誠, 中谷正生, 森谷裕一, KGARUME Thabang, 村上理, 大槻憲四郎, PHILIP Joachim, MASAKALE Thabang, RIBEIRO Luiz, 矢部康男, 川方裕則, WARD Anthony, DURRHEIM Raymond, DURRHEIM Raymond, 小笠原宏

    資源・素材学会春季大会(Web)　2016　2016

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. Consideration on the 2011 off the Pacific Coast of Tohoku Earthquake and the 2004 Sumatra Earthquake

    Ariyoshi Keisuke, Matsuzawa Toru, Yabe Yasuo, Kato Naoyuki, Hino Ryota, Hasegawa Akira, Kaneda Yoshiyuki

    JAMSTEC Report of Research and Development　13　(13)　17-33　2011

    Publisher: Japan Agency for Marine-Earth Science and Technology

    DOI： 10.5918/jamstecr.13.17 　

    ISSN： 1880-1153

    More details Close

    &nbsp;&nbsp;We review previous numerical simulations of interaction between fault segments on a plate interface based on a friction law, comparing combined events with single events on the amount of coseismic and preseismic slip. We find out the characteristics of combined event: (i) In case of multiple fault segments nearby enough to have short delay time of rupturing, coseismic slip is increased nearly in proportion to the size of combined fault segment while preseismic slip is almost the same as single event. (ii) In case of those distant enough to have long delay time of rupturing, seismic moment magnitude is almost the same as single event while preseismic slip is significantly increased by several tens percents. We discuss several combined earthquakes in Sumatra with short-term and long-term delay times and the possibility of megathrust earthquakes following the 2011 off the Pacific Coast of Tohoku Earthquake occurring off Kanto and off Sanriku with long-term delay time in the near future. We point out that seafloor observation of crustal deformation and seismicity off Kanto, Sanriku and Tokachi is necessary to enhance the detection ability of preseismic changes.

  18. コーダ波スペクトル比法による極微小地震(-3<M<-1)のコーナー周波数の推定

    和田直也, 川方裕則, 村上理, 小笠原宏, 土井一生, 吉光奈奈, 中谷正生, 矢部康男, 直井誠, 宮川幸治, 三宅弘恵, 井出哲, 五十嵐俊博, MOREMA G., PINDER E.

    日本地震学会秋季大会講演予稿集　2010　2010

  19. 2台の歪計から約100mで続発したMw~2の震源メカニズムと周辺領域の長期的な応力変化-南アフリカMponeng金鉱山

    桂泰史, 小笠原宏, 川方裕則, 中谷正生, 直井誠, 矢部康男, 安武剛太, 山本覚仁, 石井紘, PINDER E., MOREMA G.

    日本地震学会秋季大会講演予稿集　2010　2010

  20. 「地震学夏の学校2009」総合報告

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

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

    ISSN： 0919-5319

  21. Observation of numerous aftershocks of an M<inf>w</inf> 1.9 earthquake with an AE network installed in a deep gold mine in South Africa

    Yasuo Yabe, Joachim Philipp, Masao Nakatani, Gilbert Morema, Makoto Naoi, Hironori Kawakata, Toshihiro Igarashi, Georg Dresen, Hiroshi Ogasawara

    Earth, Planets and Space　61　(10)　e49-e52　2009/10

    DOI： 10.1186/BF03352963 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  22. Aftershock activity of a M2 earthquake in a deep South African gold mine-spatial distribution and magnitude-frequency relation-

    NAOI MAKOTO, NAKATANI MASAO, KWIATEK GRZEGORZ, PLENKERS KATRIN, YABE YASUO

    日本地震学会秋季大会講演予稿集　2009　27　2009/10/01

  23. 南アフリカ 金鉱山における半制御地震発生実験国 際共同研究グループ, 南アフリカ金鉱 山における半制御地震発生実験-至近距 離観測による地震発生過程の解明に向 けて- Peer-reviewed

    小笠原 宏, 川方 祐則, 中谷 正生, 矢部 康男

    地震2　61　2009

  24. 南アフリカ金鉱山M2震源域における高周波数サンプリングでの至近距離3Dアレー観測

    和田直也, 中谷正生, 矢部康男, 直井誠, 宮川幸治, 小笠原宏, 川方裕則, 安武剛太, 吉光奈奈, 三宅弘恵, 井出哲, 五十嵐俊博, MOREMA G., PINDER E.

    日本地震学会秋季大会講演予稿集　2009　2009

  25. 歪計から20mで発生したM2の断層滑り方向延長部で続発したM~2地震に関連する歪変化-南アフリカMponeng金鉱山

    桂泰史, 小笠原宏, 安武剛太, 川方裕則, 山本覚仁, 中谷正生, 直井誠, 矢部康男, 石井紘, PINDER E., MOREMA G.

    日本地震学会秋季大会講演予稿集　2009　2009

  26. 超高周波AE(<200kHz)・微小地震観測と,弾性波透過試験による観測網評価―南アフリカ半制御地震発生実験―

    直井誠, 中谷正生, 五十嵐俊博, 新谷陽一郎, 永田広平, 桑野修, 吉田真吾, 佐野修, 山田卓司, 矢部康男, 小笠原宏, 川方裕則, 安武剛太, 山本覚仁, 飯尾能久, STANCHITS S, DRESEN G, PHILIPP J, MOREMA G, WARD T, NORTIJE T, CARSTENS R, PRETORIUS J, VAN ASWEGEN G, PINDER E, MILEV A

    日本地震学会秋季大会講演予稿集　2007　96　2007/10/01

  27. 宮城県沖のプレート境界面を想定した断層セグメント間の相互作用

    有吉慶介, 松澤暢, 矢部康男, 長谷川昭, 加藤尚之

    SENAC　39　(4)　15-36　2006/10

    Publisher: Super-Computing System Information Synergy Center, Tohoku University

    ISSN： 0286-7419

  28. 地震発生前後のすべりの時空間発展と摩擦パラメターとの関係

    有吉慶介, 矢部康男, 長谷川昭

    日本地震学会秋季大会講演予稿集　2003　2003

  29. 東北日本弧における3次元プレート境界面の数値シミュレーション

    有吉慶介, 加藤尚之, 矢部康男, 長谷川昭

    日本地震学会秋季大会講演予稿集　2002　2002

  30. AE 活動 摩擦挙動のすべり量依存性に関するモデル

    地球惑星科学関連学会2002年合同大会　2002

  31. b値の空間変化にもとづく沈み込みプレート境界面の力学的性質

    矢部康男

    地球惑星科学関連学会2002年合同大会講演予稿集　2002

  32. 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

  33. Earthquake triggering model based on a single degree of freedom spring-mass system with inertia

    YABE Yasuo, HIRASAWA Tomowo

    1999　(2)　A37　1999/11/09

  34. Interaction between fault segments on subducting plate interface

    ARIYOSHI Keisuke, YABE Yasuo, KATO Naoyuki, YAMAMOTO Kiyohiko, HIRASAWA Tomowo

    1999　(2)　A47　1999/11/09

  35. Stresses at sites close to the Nojima earthquake fault estimated on core samples:III

    SATO Namiko, YABE Yasuo, YAMAMOTO Kiyohiko, HIRASAWA Tomowo

    1999　(2)　C14　1999/11/09

  36. DRAによるいくつかの応力評価例

    山本 清彦, 矢部 康男, 佐藤 凡子

    資源・素材　1998　(1)　29-32　1998/11

    ISSN： 0919-7915

  37. Hypocenter Distribution off Fukushima, Determined by an Ocean Bottom Seismographic Observation

    YOSHIZAWA T., SHINOHARA M., AOYAGI Y., NISHINO M., ASANO Y., YABE Y., HINO R., MOCHIZUKI K., SUYEHIRO K., FUJIE G., KORESAWA S., SATO T., SHIOBARA H.

    1998　(2)　1998/10/09

  38. Earthquakes with Similar Waveforms off Fukushima as Revealed by Ocean Bottom Seismographic Observation

    AOYAGI Y., SHINOHARA M., YOSHIZAWA T., NISHINO M., ASANO Y., YABE Y., HINO R., MOCHIZUKI K., SUYEHIRO K., FUJIE G., KORESAWA S., SATO T., SHIOBARA H.

    1998　(2)　1998/10/09

  39. Stresses at sites close to the Nojima earthquake fault estimated on core samples : 1

    YAMAMOTO Kiyohiko, YABE Yasuo, SATO Namiko

    1998　(2)　1998/10/09

  40. Multiple unstable slip events on a fault with a bend (3) Recurrence interval vs. stress drop

    SATOH T., YABE Y., KATO N.

    1998　(2)　1998/10/09

  41. コア試料で測定された断層近傍の地殻応力 (総特集 断層解剖計画) -- (1部 ボーリング孔内の実験・観測を通してみた野島断層)

    山本 清彦, 矢部 康男

    号外地球　(21)　70-75　1998

    Publisher: 海洋出版

    ISSN： 0916-9733

  42. Seismic activity in relation to the in-situ stresses measured on rock samples

    YAMAMOTO Kiyohiko, YAMAMOTO Hidekazu, YABE Yasuo

    1997　(2)　1997/09/15

  43. Response of regional seismicity to the △CFF produced by the 1996 Onikoube Earthquakes with M5.9 and M5.7

    UMINO N., YABE Y., HASEGAWA A.

    1997　(2)　1997/09/15

  44. Effect of normal stress on AE occurrence rate

    YABE Y., SATOH T., NISHIZAWA O., YAMAMOTO K., HIRASAWA T.

    1997　(2)　1997/09/15

  45. 「1996年地震学夏の学校」総合報告

    渡辺 和俊, 矢部 康男, 中原 恒, 長尾 栄広, 藤原 賢也, 早川 俊彦, 飯島 健徳, 森田 隆生, 矢部 康男

    日本地震学会ニュースレター　8　(4)　10-18　1996/11/10

    ISSN： 0919-5319

Show all ︎Show first 5

Presentations 126

  1. A provisional PROTEA plan (Science and finance) and the problems to address Invited

    Yabe, Y

    DSeis-PROTEA meeting in Tokyo　2024/06/03

  2. An Mw2.2 event on a mafic dyke with forerunners and stress measured and drilling into the hypocenter Invited

    Yabe, Y

    DSeis-PROTEA meeting in Tokyo　2024/06/03

  3. Introduction of a new drilling project “Probing the heart of an earthquake and life in the deep subsurface (PROTEA)”

    矢部 康男, Manzi Musa, Gomez-Arias Alba, Nisson Devan, Castillo Julio, Durhheim Raymond, 小笠原 宏, Kieft Thomas, Perl Sco

    日本地球惑星科学連合2024年大会　2024/05/28

  4. Meta-omic Characterizations of Ultra-Deep Biosphere Hosted in Bushveld Complex

    Castillo Hernadez Julio, 鈴木 庸平, 小笠原 宏, 矢部 康男

    日本地球惑星科学連合2024年大会　2024/05/28

  5. The Deep Subsurface Biosphere: DSEIS and PROTEA Projects Invited

    Kieft Thomas, Gomez-Arias Alba, Castillo Hernadez Julio, Nisson Deva, 小笠原 宏, 矢部 康男

    日本地球惑星科学連合2024年大会　2024/05/28

  6. ICDP DSeis計画：M5.5地震発生場回収コアのITRAX XRFスキャン元素分析

    小笠原 宏, 大場 誠也, 小川 巧太郎, 藤田 蕉, 濱垣 貴也, 馬場 喜生, 矢部 康男, 松崎 琢也, 山本 祐二, DSeis Team

    日本地球惑星科学連合2024年大会　2024/05/28

  7. From DSeis to PROTEA - Probing the heart of an earthquake, especially the interaction between metasedimentary rocks and mantle-derived intrusions.

    Hiroshi Ogasawara, Yasuo Yabe, Raymond Durrheim, Musa Manz, Thomas Kief, Devan Nisson, Julio Castillo, Alba Gómez-Arias

    EGU General Assembly 2024　2024/04/16

  8. Frictional properties of the fault hosting aftershocks of the 2014 Orkney earthquake (M5.5), South Africa, and proposal of a new drilling project PROTEA to probe the heart of the earthquake

    Yabe, Y, Ogasawara, H, Durrheim, R

    EGU General Assembly 2024　2024/04/16

  9. PROTEA overview -Preliminary plan- Invited

    Yabe, Y

    DSeis-PROTEA meeting　2024/01/24

  10. Frictional properties of fault rocks recovered by DSeis -Motivation to PROTEA- Invited

    Yabe, Y

    DSeis-PROTEA meeting　2024/01/22

  11. Purpose of this meeting -From DSeis to PROTEA- Invited

    Yabe, Y

    DSeis-PROTEA meeting　2024/01/22

  12. Rock Friction in and around Aftershock Cloud of the Orkney Earthquake, South Africa, Drilled by ICDP-DSeis Project

    Yabe, Y, H. Ogasawara, R. Durrheim

    AGU23　2023/12/15

  13. 石英ガウジの摩擦の素過程に対する水蒸気の影響

    矢部康男

    日本地震学会2023年秋季大会　2023/11/01

  14. ICDP DSeis:2014年オークニー地震の余震発生帯をホストしているlamprophyyreダイクの鉱物組み合わせと変質の空間変化

    小笠原 宏, 土`山 明, 松野 淳也, 矢部 康男, 松崎 琢也, 山本 裕二, 阪口 賢祐, 大場 誠也, 藤谷 恵, 深尾 侑紀, 山口 明音, 鈴木 皓一郎, 小川 巧太郎, 藤田 蕉, DSeis Team

    日本地球惑星科学連合2023年大会　2023/05/23

  15. ICDP-DSeis project to drill into the aftershock cloud of the 2014 Orkney earthquake

    Yasuo Yabe, Hiroshi Ogasawara, Raymond Durrheim, Musa Manzi, Thomas Kief

    Geocongress 2023　2023/01/11

  16. ICDP drilling into the upper fringe of the aftershock zone of the 2014 Orkney M5.5 earthquake that ruptured an almost entire depth range ofthe West Rand Group (2.9 Ga)

    H. Ogasawara, Y. Yabe, B. Liebenberg, R.J. Durrheim, T.C. Onsto, T.L. Kief, D. Nisson, J. Castillo, A. Gómez-Arias, he DSeis team

    Geocongress 2023　2023/01/11

  17. Rock friction in and around aftershock cloud of the Orkney earthquake, South Africa, drilled by ICDP-DSeis project

    矢部 康男, 小笠原 宏, Durrheim Raymond, Manzi Musa

    日本地球惑星科学連合2023年大会　2023/05/22

  18. ICDP DSeis: M5.5オークニー地震余震域から採取した断層試料の物質科学的特徴

    宮本 英, 廣野 哲朗, 横山 友暉, 金木 俊也, 山本 裕二, 石川 剛志, 𡈽山 明, 片山 郁夫, 矢部 康男, ZIEGLER Martin, DURRHEIM Raymon, 小笠原 宏

    日本地震学会2022年秋季大会　2022/10/26

  19. DSeis Report 3: 地下約3 kmの非天水環境下における超塩水/地震を伴う苦鉄質/超苦鉄質の隣接ダイクの孔内物理検層と回収コアの地震波速度測定の比較

    藤田 蕉, 小笠原 宏, 矢部 康男, 山本 裕二, DSeis Team

    JpGU Meeting 2022 Online　2022/06/01

  20. DSeis Report 2 地下約3 kmの非天水環境下における超塩水/地震を伴う苦鉄質/超苦鉄質の隣接ダイクの物理化学特性

    大場 誠也, 脇本 雅也, 藤田 蕉, 小川 巧太郎, 小笠原 宏, 矢部 康男, 松崎 琢也, 山本 裕二, DSeis Team

    JpGU Meeting 2022 Online　2022/06/01

  21. DSeis Report 5: M5.5 Orkney地震の余震発生帯上縁部周辺での452個のコアのDCDA応力測定のまとめ

    美間 良大, 小笠原 宏, 矢部 康男, 船戸 明雄, 伊藤 高敏

    JpGU Meeting 2022　2022/05/24

  22. ICDP DSeis project: an overview of the 2020 research activity Invited

    Hiroshi Ogasawara, ICDP DSeis Team

    Japan Geoscience Union Meeting 2021　2021/06/04

  23. ICDP DSeis project: compilation of borehole logging and recovered core information at the seismogenic zone of the M5.5 Orkney earthquake with lower crustal intrusives

    Hiroshi Ogasawara, Syunsuke Yoshida, Mitsuya Higashi, Kensuke Sakaguchi, Yuki Yokoyama, Yasuo Yabe, Tetsuro Hirono, Dakalo Ligaraba, Nandipha Masondo, Yuhji Yamamoto, ICDP DSeis Team

    Japan Geoscience Union Meeting 2021　2021/06/06

  24. ICDP DSeis: Stress state around M5.5 Orkney earthquake estimated by DCDA

    SSJ meeting 2020　2020/10/31

  25. Stress state in the upper margin of the aftershock zone of the 2014 Orkney earthquake (M5.5), South Africa, estimated from analyses of drill cores and borehole breakouts of ICDP-DSeis drillings

    Y. Yabe, M. Kanematsu, M. Higashi, R. Tadokoro, S. Yoshida, K. Sugimura, H. Ogasawara, T. Ito, A. Funato, M. Ziegler, B. Liebenberg, B. Watson, S. Mngadi, M. Manzi, R. Durrheim

    EGU General Assembly 2020　2020/05/06

  26. The seismogenic zones of an M2.0-5.5 earthquakes successfully recovered in deep South African gold mines: the outcomes and the follow-up plan

    H. Ogasawara, B. Liebenberg, Y. Yasuo, Y. Yokoyama, T. Hirono, D. Nisson, T. Onstott, T. Kieft, E. van Heerden, T. Wiersberg, T. Noda, M. Manzi, S. Mngadi, R. Durrheim, Y. Yamamoto, T. Ito, A. Funato, M. Ziegler, J. Mori, C. Dinske, The ICDP DSeis team

    EGU General Assembly 2020　2020/05/05

  27. The effect of gouge formation on fault propagation along underground brittle shear fractures.

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

    American Geophysical Union 2019　2019/12/09

  28. Stress state in the upper margin of aftershock zone of the 2014 Orkney earthquake (M5.5), South Africa, measured from boring cores of ICDP-DSeis project

    Y. Yabe, M. Kanematsu, M. Higashi, R. Tadokoro, S. Yoshida, K. Sugimura, H. Ogasawara, T. Ito, A. Funato, B. Leibenberg, B. Watson, S. Mngadi, M. Manzi, R. Durrheim, ICDP DSeis team

    American Geophysical Union 2019　2019/12/09

  29. Potential borehole observatory in the aftershock zone at about 3.5 km depth of a 2014 M5.5 sinistral earthquake that the ICDP DSeis project has probed

    American Geophysical Union 2019　2019/12/09

  30. M5.5 Orkney地震を引き起こした断層岩および母岩の鉱物組成と微小構造(ICDP DSeis Project)

    横山友暉, 廣野哲朗, 小笠原宏, 矢部康男

    日本地震学会秋季大会　2019/09/18

  31. ICDP DSeis 4: Drilling, core logging, and in-hole geophysical logging of ICDP DSeis drilling into the M5.5 aftershock zones in a South African gold mines.

    S. Yoshida, R. Tadokoro, K. Sugimura, M. Kanematsu, M. Higashi, B. Liebenberg, E. van Heerden, Y. Mukuhira, R. Conze, Y. Yabe, S. Kaneki, Y. Yokoyama, N. Nkosi, D.Roberts, S. Buccio, H. Ogasawara

    Japan Geoscience Union Meeting 2019　2019/05/27

  32. ICDP DSeis 2: Preliminary results of physical property measurement and XRD analysis of the M5.5 fault material recovered from DSeis Project

    T. Hirono, Y. Yokoyama, S. Kaneki, H. Ogasawara, Y. Yabe, T. Matsuzaki, Y. Yamamoto, E. Tokuyama, T. Onstott, M. Ziegler, R. Durrheim, E. van Heerden, B. Liebenberg, The ICDP DSeis team

    Japan Geoscience Union Meeting 2019　2019/05/27

  33. ICDP DSeis 3: Spatial variation in stress state in the source region of Orkeny earthqauke (M5.5) based on analyses of the ICDP-DSeis borehole cores

    Y. Yabe, A. Ishida, K. Sugimura, M. Kanematsu, M. Higashi, S. Yoshida, B. Liebenberg, T. Ito, A. Funato, B. Watson, R. Durrheim, H. Ogasawara

    Japan Geoscience Union Meeting 2019　2019/05/27

  34. ICDP DSeis 7: Compilation of stress information and comparison with calculated stresses in the M5.5 aftershock zones

    M. Higashi, Y. Yabe, K. Sugimura, A. Ishida, M. Kanematsu, S. Yoshida, R. Tadokoro, T. Ito, A. Funato, H. Ogasawara

    Japan Geoscience Union Meeting 2019　2019/05/27

  35. ICDP DSeis 5: Diametrical Core Deformation Analysis of the M5.5 aftershock zone core - stress concentration at reflective intrusives and transition in stress regimes.

    K. Sugimura, S. Yoshida, R. Tadokoro, H. Ogasawara, A. Ishida, Y. Yabe, T. Ito, A. Funato, S. Mngadi, R. Durrheim

    Japan Geoscience Union Meeting 2019　2019/05/27

  36. ICDP DSeis 1: Introduction into JpGU 2019 papers on Drilling into Seismogenic zones of M2.0-5.5 earthquakes in South African gold mines

    H. Ogasawara, B. Liebenberg, M. Ziegler, Y. Yabe, R. Durrheim, M. Manzi, T. Onstott, W. Thomas

    Japan Geoscience Union Meeting 2019　2019/05/27

  37. ICDP DSeis 6: Deformation Rate Analysis of the M5.5 aftershock zone core - stress concentration at reflective intrusives

    M. Kanematsu, M. Higashi, Y. Yabe, S. Abe, B. Watson, R. Durrheim, H. Ogasawara

    Japan Geoscience Union Meeting 2019　2019/05/27

  38. An overview of the completed ICDP project, Drilling into Seismogenic zones of M2.0-5.5 earthquakes in South African gold mines (DSeis)

    H. Ogasawara, B. Liebenberg, Y. Yabe, R.Durreheim, M. Ziegler, M. Manzi, S. Mngadi, T. Onstott, S. Kaneki, Y. Yokoyama

    EGU General Assembly 2019　2019/04/11

  39. In-situ stress around earthquake source faults in and beneath South African deep gold mines

    Y. Yabe, S. Abe, T. Ito, A. Ishida, K. Sugimura, M. Kanematsu, M. Higashi, R. Tadokoro, H. Ogasawara, A. Funato, H. Kato, B. Watson, S. Mngadi, R. Durrheim, G. Hofmann, L. Sheepers

    EGU General Assembly 2019　2019/04/08

  40. M5.5 Orkney 地震の余震発生帯から回収された断層岩の微小変形構造（ICDP DSeis project）

    横山友暉, 金木俊也, 廣野哲朗, 矢部康男, 小笠原宏

    日本地震学会　2018/10/10

  41. 南アフリカMponeng 金鉱山地表下3.3 km で発生したM2 地震前後のAcoustic Emission の震源位置標定と絶対規 模推定

    松田幹生, 直井誠, 南隆太郎, 石田毅, 中谷正生, 矢部康男

    日本地震学会　2018/10/10

  42. 南アフリカ大深度金鉱山で発生したMw2.2 の地震の震源域の応力場

    矢部康男, 阿部周平, 小笠原宏, 伊藤高敏, 船戸明雄, R. Durrheim, H. Yilmaz, G. Hofmann

    日本地震学会　2018/10/10

  43. An overview of DSeis endeavours in Cooke 4 mine and laboratory tests on DSeis cores

    Siyanda Mngadi

    SSJ meeting　2018/10/10

  44. M5.5 Orkney 地震の余震発生帯から回収された断層岩の鉱物学的特徴（ICDP DSeis project）

    金木俊也, 横山友暉, 廣野哲朗, 矢部康男, 小笠原宏

    日本地震学会　2018/10/10

  45. ICDP 南アフリカ金鉱山 地震発生場掘削の完了

    小笠原宏, 矢部康男, 伊藤高敏, DSeisチーム

    日本地震学会　2018/10/10

  46. Nonlinear rock behaviour in polycrystalline rock and its implication on underground stress measurements

    Bryan Watson, ICDP DSeis Team

    日本地震学会　2018/10/10

  47. Stress state in the source region of M2-3 earthquakes in South African deep gold mines International-presentation

    YABE Yasuo

    JpGU　2018/05/23

  48. Nearly completion of ICDP drilling into M2.0 – M5.5 seismogenic zones in South African gold mines (DSeis) International-presentation

    Hiroshi Ogasawa

    JpGU　2018/05/22

  49. Stress measurement using cores of drilling into seismognic zone of M2.0-M5.5 earthquakes in South African gold mines (ICDP DSeis project) International-presentation

    Akimasa Ishida

    JpGU　2018/05/22

  50. The status of on-going drilling into seismogenic zones of M2.0 – M5.5 earthquakes from deep South African gold mines (DSeis) International-presentation

    R. Durrheim

    EGU　2018/04/12

  51. Recovery of ruptures from seismogenic zones at Cooke 4 mine (ICDP scientific drilling project in the South-African gold mines) International-presentation

    Neta Wechsler

    EGU　2018/04/12

  52. The DSeis Project: Drilling into Seismogenic zones of M2.0 to M5.5 earthquakes in South African gold mines International-presentation

    Yabe,Y, H. Ogasawara, T. Ito, G. van Aswegen, R. Durrheim, A. Cichowicz, T. C. Onstott, T. L. Kieft, M. S. Boettcher, S. Wiemer, M. Ziegler, S. A. Shapiro, H. K. Gupta, P. Dight

    AGU　2017/12/11

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    ポスター（招待講演）

  53. A New Method of Stress Measurement Based upon Elastic Deformation of Core Sample with Stress Relief by Drilling International-presentation

    Ito, T, A. Funato, T. Tamagawa, K. Tezuka, Y. Yabe, H. Ogasawara

    AGU　2017/12/11

  54. Faults at focal depth - an extension to the ICDP DSEIS project in the South-African gold mines International-presentation

    Wechsler, N, G. Van Aswegen, L. Kamhaji, Y. Yabe, H. Ogasawara

    12th Euro-conference on Rock Physics and Geomechanics　2017/11/05

  55. Very small repeating earthquakes on a geological fault at 1-km depth in a gold mine in South Africa International-presentation

    Naoi, M, J. Yamaguchi, M. Nakatani, H. Moriya, T. Igarashi, T. Kgarume, O. Murakami, T. Maskale, Y. Yabe, K. Otsuki, H. Kawakata, T. Ishida, L. Ribeiro, A. Ward, R. Durrheim, H. Ogasawara

    IASPEI　2017/07/30

  56. An integrated estimation of the stress field in seismogenic zones in South African gold mines International-presentation

    Ishida, A, H. Ogasawara, Y. Yabe, A. Funato, T. Ito, S. Abe, R. Durrheim, S. Mngadi, A. Milev, H. Kato, G. Hofmann, D. Roberts, M. Naoi, SATREPS

    IASPEI　2017/07/30

  57. An overview of an ICDP project to drill into seismogenic zones of M2.0 – M5.5 earthquakes in deep South African gold mines (DSeis) International-presentation

    Ogasawara, H, Y. Yabe, T. Ito, G. van Aswegen, A. Cichowics, M. Grobbelaar, R. Durrheim, M. Ziegler, M. Boettcher, T. C. Onstott, DSeis team

    IASPEI　2017/07/30

  58. Estimate of the stress state in a close proximity to an earthquake source in a South African deep gold mine International-presentation

    Abe, S, Y. Yabe, T. Ito, M. Nakatani, G. Hofmann, H. Ogasawara

    IASPEI　2017/07/30

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    本学学生

  59. 低速リング剪断試験による断層変位量と ESR 信号強度の評価

    田中桐葉, 武藤潤, 矢部康男, 岡壽嵩, 中村教博, 長濱裕幸

    JpGU-AGU　2017/05/20

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    本学学生

  60. Estimate of the stress state in the source region of Mw 2.2 earthquake in a South African deep gold mine

    阿部 周平, 矢部 康男, 伊藤 高敏, 中谷 正生, Hofmann Gerhar, 小笠原 宏

    JpGU-AGU　2017/05/20

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    本学学生

  61. ICDP 大深度南アフリカ金鉱山におけるM2.0-5.5地震発生場掘削計画（DSeis）ー掘削の開始

    小笠原 宏, 矢部 康男, 伊藤 高敏, an Aswegen Gerrie

    JpGU-AGU　2017/05/20

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    共著

  62. 南アフリカ大深度金鉱山での震源断層掘削

    矢部康男, 小笠原宏, 伊藤高敏, 南アフリカ金鉱山半制御地震発生実験グループ

    次期計画検討シンポジウム　2017/05/01

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    筆頭

  63. Initial report on drilling into seismogenic zones of M2.0 – M5.5 earthquakes from deep South African gold mines (DSeis) International-presentation

    Hiroshi Ogasawara, Raymond Durrheim, Yasuo Yabe, Takatoshi Ito, Gerrie van Aswegen, Michelle Grobbelaar, Akio Funato, Akimasa Ishida, Hiroyuki Ogasawara, Siyanda Mngadi, Musa Manzi, Martin Ziegler, Tony Ward, Pamela Moyer, Margaret Boettcher, Bill Ellsworth, Bennie Liebenberg, Neta Wechsler, Tullis Onstott, Nicolas Berset, the DSeis Team

    EGU General Assembly　2017/04

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    共著

  64. DSeis project -Drilling into seismogenic zones of M2.0 – M5.5 earthquakes in deep South African gold mines- International-presentation

    SEISMS workshop　2017/03/29

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    筆頭

  65. Estimate of the stress state in an earthquake source region in a South African deep gold mine by Diametrical Core Deformation Analysis (DCDA) International-presentation

    Shuhei Abe, Yasuo Yabe, Takatoshi Ito, Gerhard Hofmann, Hiroshi Ogasawara, Masao Nakatani

    AGU　2016/12/15

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    本学学生

  66. 南アフリカCooke 4金鉱山地下1 km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, Thabang Kgarume, Joachim Philipp, 村上理・Thabang Masakale・Luiz Ribeiro, 矢部康男, 川方裕則, Anthony Ward, 石田毅・Ray Durrheim, 小笠原宏

    日本地震学会　2016/10/06

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    共著

  67. 南アフリカ金鉱山の地震観測網による2014年オーク二ー地震の余震分布と発震機構解

    今西和俊, 小笠原宏, 矢部康男, 堀内茂木, 大久保慎人, 村上理

    JpGU　2016/05/26

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    共著

  68. 大深度南アフリカ金鉱山からのM2.0-M5.5の地震発生場の科学掘削計画（DSeis）

    小笠原宏, 矢部康男, 伊藤高敏, van Aswegen Gerrie・Cichowicz Artur・Durrheim Raymon, Mori James, Onstott Tullis・Kieft Thomas, Boettcher Margaret・Wiemer Stefan・Ziegler Martin, Janssen Christoph・Shapiro Serge・Gupta Harsh・Dight Phil・ICDP DSeis team

    JpGU　2016/05/26

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    共著

  69. コア変形法による南アフリカ大深度金鉱山誘発地震震源域の応力状態の推定

    阿部周平, 矢部康男, 伊藤高敏, 中谷正生, Gerhard Hofmann, 小笠原宏

    JpGU　2016/05/25

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    本学学生

  70. 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, 小笠原宏

    JpGU　2016/05/25

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    共著

  71. Drilling into seismogenic zones of M2.0-M5.5 earthquakes in deep South African gold mines (DSeis) International-presentation

    H Ogasawara, R Durrheim, Y Yabe, T Ito, G van Aswegen, A Cichowicz, T Onstott, Kieft, M Boettcher, S Wiemer, M Ziegler, C Janssen, S Shapiro, Gupta, P Dight, the ICDP DSeis Team

    EGU General Assembly　2016/04/17

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    共著

  72. Coseismic and aseismic response of the rock mass surrounding deep level mining operations International-presentation

    A Milev, R Durrheim, M Naoi, Y Yabe, H Ogasawara, M Nakatani

    EGU General Assembly　2016/04/17

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    共著

  73. Drilling into seismogenic zones of M2.0-M5.5 earthquakes in deep South African gold mines (DSeis) International-presentation

    H Ogasawara, Y Yabe, T Ito, G van Aswegen, A Cichowicz, R Durrheim, JST-JICA SATREPS, JSPS, Participants of relevant, DSeis meetings

    AGU　2015/12/14

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    共著

  74. Acoustic emission monitoring in Cooke 4 gold mine in South Africa-Summary of the main findings of a 5-year SATREPS project International-presentation

    M Naoi, M Nakatani, H Moriya, K Otsuki, T Kgarume, JPhilipp, O Murakami, T Masakale, L Ribeiro, Y Yabe, H Kawakata, A Ward, R Durrheim, H Ogasawara

    AGU　2015/12/14

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    共著

  75. Effects of fluid-rock interactions on faulting within active fault zones - evidence from fault rock samples retrieved from international drilling projects International-presentation

    C Janssen, R Wirth, M Kienast, Y Yabe, J Sulem, G H Dresen

    AGU　2015/12/14

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    共著

  76. Evolutions of friction properties and acoustic emission source parameters associated with large sliding International-presentation

    Y Yabe, T. Iida, H. Tsuda

    AGU　2015/12/14

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    本人

  77. Drilling into the Mw2.2 hypocenters International-presentation

    The ICDP DSeis Workshop　2015/10/31

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    本人

  78. Stress measurement in earthquake prone ground International-presentation

    The ICDP DSeis Workshop　2015/10/31

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    本人

  79. JAGUARS AE network monitoring and foreshocks accelerated toward a Mw2.2 earthquake International-presentation

    The ICDP DSeis Workshop　2015/10/31

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    本人

  80. 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, T, Kgarume,J Philipp, 村上理, T Masakale, L Ribeiro, 矢部康男, 川方裕則, A Ward, R Durrheim, 小笠原宏

    日本地震学会　2015/10/26

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    共著

  81. 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, T. KgarumeJ Philipp, 村上 理, T Masakale, L Ribeiro, 矢部康男, 川方裕則, A Ward, 石田 毅, R Durrheim, 小笠原 宏

    日本地震学会　2015/10/26

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    共著

  82. 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, T Kgarume, J Philipp村上 理, T Masakale, L Ribeiro, 矢部康男, 川方裕則, A Ward, 石田 毅, R Durrheim, 小笠原 宏

    日本地震学会　2015/10/26

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    共著

  83. M2～5級南アフリカ金鉱山誘発地震群の震源域での弾性協会要素法応力解析による地震発生の再現とMohr-Coulomb破壊基準の拘束

    内浦大海, 石田亮壮, 小笠原宏幸, 小笠原 宏, G Hofmann, M Wiggins, W Stone, P Ndaba, J Plotz, P Lenegan, H Yilmaz, T Zvarivadza, S MngadiA Carpede, R Durrheim, Milev矢部康男, 加藤春實, A Cichowica, 堀内茂木, 大久保慎人, 山口照寛

    日本地震学会　2015/10/26

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    共著

  84. Evolution of AE source parameters associated with large frictional sliding distance International-presentation

    Yabe, Y, H. Tsuda, T. Iida, S. Abe

    Asia Oceania Geosciences Society　2015/08/02

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    本人

  85. Drilling into a hypocenter and the constrained stress International-presentation

    Yabe, Y, M. Nakatani

    SATREPS seminar　2015/06/05

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    本人

  86. 大深度南アフリカ金鉱山のM2-M5.5震源域の科学掘削計画

    小笠原 宏, 矢部 康男, 伊藤 高敏, ファンアスウェヘン ヘリ, チホビチ アルトゥール, ダーハイム レイモンド, 関連会議, 参

    日本地球惑星科学連合大会　2015/05/24

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    共著

  87. Evidence of post-seismic creep type deformations derived by tilt and acoustic emission monitoring of mining induced seismic events International-presentation

    A Milev, P-E Share, M Naoi, R Durrheim, Y Yabe, H Ogasawara, M Nakatani

    EGU General Assembly　2015/04/12

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    共著

  88. Monitoring of Microseismicity in Deep Gold Mines in South Africa International-presentation

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

    Induced Seismicity Workshop　2015/03/11

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    本人

  89. Monitoring of Microseismicity in Deep Gold Mines in South Africa International-presentation

    Ogasawara, H, D. Birch, A. Cichowicz, S. Horiuchi, M. Okubo, O. Murakami, G. Hofmann, L. Scheepers, H. Kato, Y. Yabe, M. Nakatani, M. Naoi, R. Durrheim, SATREPS research group

    Induced Seismicity Workshop　2015/03/11

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    その他

  90. 摩擦すべりに伴うAEの震源パラメターの累積変位依存性

    津田寛大, 矢部康男

    地震発生の素過程研究集会　2015/02/23

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    本学学生

  91. 岩塩の脆性-準脆性遷移における力学的挙動と破壊伝搬の特徴

    吉田佳明, 平内健一, 矢部康男

    地震発生の素過程研究集会　2015/02/23

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    その他

  92. 南アフリカムポネン金鉱山で発生したMw2.2の地震の前震活動と準備過程

    矢部康男, 中谷正生, 直井誠, Christoph Janssen, 川方裕則

    地震発生の素過程研究集会　2015/02/23

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    本人

  93. Nucleation process of an M2 earthquake in a deep gold mine in South Africa inferred from on-fault foreshock activity International-presentation

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

    AGU　2014/12/15

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    本人

  94. The stress and strength at hypocenters at Tau Tona and Mponeng gold mines, South Africa

    Ogasawara, H, G. Hofmann, H. Kato, C. Stander, T. Clements, P. Piper, D. Roberts, Y. Yabe, M. Naoi, M. Nakatani

    AGU　2014/12/15

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    その他

  95. Characterization of Mining Induced Seismic Events Around Deep Level Mining Excavations in South Africa Using High-Precision Underground Monitoring International-presentation

    Milev, A.M, P.E. Share, R.J. Durrheim, M. Naoi, Y. Yabe, H. Ogasawara, M Nakatani

    AGU　2014/12/15

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    その他

  96. 地震時ひずみ異常を考慮した東北日本のレオロジーモデル

    矢部康男, 大園真子, 太田雄策, 飯沼卓史, 武藤潤

    新学術領域「地殻ダイナミクス」キックオフミーティング　2014/10/19

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    本人

  97. Rheologiy Structure Beneath NE Japan Inffered From Pre- and Co-Seismic Response Against the Tohoku-oki Earthquake (Mw9.0) International-presentation

    Yabe, Y, M. Ohzono, Y. Ohta, T. Iinuma, J. Muto

    International Symposium on Geodesy for Earthquake and Natural Hazards　2014/07/22

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    本人

  98. Stress State around a Source Fault of Mw2.2 Earthquake in a Deep Gold Mine in South Africa International-presentation

    Yabe, Y, H. Ogasawara, T. Tatoh, M. Nakatani, M. Naoi, R. Durrheim, H. Yilamaz, G. Hofmann, D. Roberts

    International Symposium on Geodesy for Earthquake and Natural Hazards　2014/07/22

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    本人

  99. In-Situ Stress Measurements and Calibration of Stress Modeling to Mitigate Seismic Hazard at Deep-Levels South African Gold Mines International-presentation

    Ogasawara, H, H. Kato, G. Hofmann, C. Stander, P. Piper, T. Ward, D. Roberts, T. Clements, Y. Yabe

    International Symposium on Geodesy for Earthquake and Natural Hazards　2014/07/22

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    その他

  100. Strong motion at sources International-presentation

    Yabe, Y

    SATREPS seminar　2014/05/08

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    本人

  101. Drilling into a hypocenter and the constrained stress International-presentation

    Yabe, Y

    SATREPS seminar　2014/05/08

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    本人

  102. In-situ stress estimation from borehole breakout and core disking International-presentation

    IMS international seminar　2014/05/05

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    本人

  103. 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, J. Philipp, T. Masakale, T. Kgarume, L. Ribeiro, 矢部康男, 森谷祐一, A. Ward, R. Durrheim, 小笠原宏

    日本地球惑星科学連合大会　2014/04/28

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    その他

  104. 南アフリカ金鉱山での地震発生場での歪連続観測に基づく応力時間発展の理解

    小笠原宏, 桂泰史, G. Hofmann, 中谷正生, 矢部康男, 石井紘, 中尾茂, 大久保慎人, A. Ward, J. Wienan, P. Lenegan, 川方裕則, 村上理, 内浦大海

    日本地球惑星科学連合大会　2014/04/28

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    その他

  105. Effects of normal stress on the evolution of AE activities and frictional properties of a fault

    飯田拓郎, 矢部康男

    日本地球惑星科学連合大会　2014/04/28

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    本人

  106. 素過程部会成果報告

    地震及び火山噴火予知のための観測研究計画」平成25年度成果報告シンポジウム　2014/03/12

  107. 南アフリカ大深度金鉱山におけるMw2.2の地震の震源域掘削に基づく応力推定

    日本地震学会　2013/10/07

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    矢部康男, 小笠原宏, 佐藤隆司, 中谷正生, 直井誠, R. Durrheim, H. Yilmaz, G. Hofmann, D. Roberts

  108. 摩擦すべりに伴うAEと断層の摩擦特性の関係

    飯田拓郎, 矢部康男

    日本地震学会　2013/10/07

  109. 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の小繰り返し地震

    日本地震学会　2013/10/07

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    直井誠，中谷正生，大槻憲四郎，Thabang Kgarume，Joachim Philipp, Thabang Masakale，Luiz Ribeiro, 森谷祐一，村上理，矢部康男，川方裕則，Anthony Ward，Ray Durrheim, 小笠原宏

  110. 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

    日本地震学会　2013/10/07

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    村上理・川方裕則・吉光奈奈・中谷正生・直井誠・Joachim Philipp・Thabang Masakale・Thabang Kgarume・Luiz Ribeiro・森谷祐一・矢部康男・Anthony Ward・Ray Durrheim・小笠原宏

  111. In-situ monitoring and modelling of the rock mass response to mining: Japanese-South African collaborative research

    8th International Symposium on Rockbursts and Seismicity in Mines　2013/09/01

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    Ogasawara, H., G. Hofmann, H. Kato, M. Nakatani, H. Moriya, M. Naoi, Y. Yabe, R. Durrheim, A. Cichowicz, T. Kgarume, A. Milev, O. Murakami, T. Satoh, and H. Kawakata

  112. Estimation of stress state around a fault of Mw2.1 earthquake in a deep gold mine in South Africa based on borehole breakout and core discing International-presentation

    The 6th International Symposium on In-Situ Rock Stress　2013/08/20

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    Y. Yabe, M. Nakatani, M. Naoi, T. Iida, T. Satot, R. Durrheim, G. Hofmann, H. Yilmaz, H. Ogasawara

  113. In-situ Stress Measurements in and around Active Faults in Central Japan and Implications on a Recovery of Fault Strength during an Earthquake Recurrence Period International-presentation

    The 6th International Symposium on In-Situ Rock Stress　2013/08/20

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    Omura, K., F. Yamashita, and Y. Yabe

  114. Detection of mining-induced fractures associated with stress perturbation around a stope at the Cooke 4 gold mine, South Africa, by using AE events International-presentation

    The 6th International Symposium on In-Situ Rock Stress　2013/08/20

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    Moriya, H., M. Naoi, M. Nakatani, O. Murakami, T. Kgarume, A. K. Ward, R.J. Durrheim, J. Philipp, Y. Yabe, H. Kawakata, and H. Ogasawara

  115. In-situ stress measurements to constrain stress and strength near seismic faults in deep level South African gold mines International-presentation

    The 6th International Symposium on In-Situ Rock Stress　2013/08/20

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    Ogasawara, H., H. Kato, G. Hofmann, D. Roberts, P. Piper, T. Clements, Y. Yabe, and K. Sakaguchi

  116. 素過程部会成果報告

    地震及び火山噴火予知のための観測研究計画」平成24年度成果報告シンポジウム　2013/03/06

  117. AE monitoring in Cooke4 and Moab Khotsong International-presentation

    Yabe, Y, M. Nakatani, M. Naoi, H. Ogasawara

    SATREPS seminar　2013/03

  118. On-fault monitoring of acceleration and dynamic stress changes in South African mines International-presentation

    Yabe, Y, H. Ogasawara

    SATREPS seminar　2013/03

  119. What is core discing and borehole breakout? International-presentation

    Yabe, Y

    SATREPS seminar　2013/03

  120. Observational study of rock mass response to mining induced seismic events and controlled blasting experiments at deep level gold mines in South Africa International-presentation

    AGU　2012/11

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    Milev, A., R.J. Durrheim, M. Nakatani, Y. Yabe, M. Naoi, and H. Ogasawara

  121. Strain Anomalies of The Inland Crust of NE Japan Induced by The 2011 Off The Pacific Coast of Tohoku Earthquake (Mw9.0), Japan International-presentation

    Y. Yabe, M. Ohzono, Y. Ohta, T. Iinuma, J. Muto

    AOGS - AGU (WPGM) Joint Assembly 2012　2012/08/13

  122. Earthquake and stress around the inland active faults - in-situ stress measurements at Gofukuji and Hagiwara fault -

    小村健太朗, 矢部康男

    日本地球惑星科学連合2012年大会　2012/05

  123. 2011年東北地方太平洋沖地震に伴う東北日本の地殻不均質に起因するひずみ異常分布

    大園 真子, 矢部 康男, 飯沼 卓史, 太田 雄策, 三浦 哲, 立花 憲司, 佐藤 俊也, 出町 知嗣

    日本地球惑星科学連合2012年大会　2012/05

  124. AE measurements at 1 km depth in a deep South African gold mine and their activities related to two M0 earthquakes

    直井誠, 中谷正生, J. Philipp, 堀内茂木, 大槻憲四郎, T. Kgarume, G. Morema, S. Khambule, T. Masakale, 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, 小笠原 宏

    日本地球惑星科学連合2012年大会　2012/05

  125. Seismic risk mitigation in deep level South African mines by state of the art underground monitoring - Joint South African and Japanese study International-presentation

    A. Milev, R. Durrheim, M. Nakatani, Y. Yabe, H. Ogasawara, M. Naoi

    EGU General Assembly 2012　2012/04/22

  126. 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 International-presentation

    M. Naoi, M. Nakatani, J. Philipp, S. Horiuch, K. Otsuki, T. Kgarume, G. Morema, S. Khambule, T. Masakale, K. Miyakawa, A. Watanabe, H. Moriya, O. Murakami, Y. Yabe, H. Kawakata, N. Yoshimitsu, H. Ogasawara

    EGU General Assembly 2012　2012/04/22

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Industrial Property Rights 2

  1. 断層のせん断滑り抑制方法

    椋平 祐輔, 矢部 康男, ワン ルイ

    Property Type: Patent

  2. 断層の抑制方法

    椋平 祐輔, 矢部 康男, ワン ルイ

    Property Type: Patent

Research Projects 13

  1. Semi-controlled seismic observation at deep gold mine in South Africa Competitive

    System: Grant-in-Aid for Scientific Research

    2005/01 - Present

  2. in situ stress measurement using core sample Competitive

    2004/01 - Present

  3. Characteristics of AE events during frictional sliding Competitive

    1993/04 - Present

  4. 震源断層の強度・摩擦特性・応力

    矢部 康男

    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

    2022/04/01 - 2025/03/31

  5. Development of small strain meter for volcano observation

    Nishimura Takeshi

    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

    2016/04/01 - 2019/03/31

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    We developed a strain meter that can be installed close to a crater of active volcano. The strain meter consists of strain gages and stainless bar, and it is designed by using FEM numerical code to examine the sensitivity. We installed the strain meter at a depth of 20 m of the volcano flank of Sakurajima where volcanic explosions introducing volcano deformation are often observed. The strain signals are continuously recorded with a sampling frequency of 100 Hz at the site. The volcano deformations with a time scale of a few hours were not well observed with a good signal to noise ratio, but short-period seismic waves with amplitudes of about 0.5 micro strain are well recorded.

  6. Development of models for deformation and fault slip processes in the island arc crust

    Bunichiro Shibazaki, HINO Ryota, KIDO Motoyuki, HORI Takane, ARIYOSHI Keisuke, SASAJIMA Ryohei

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Institution: Building Research Institute

    2014/07/10 - 2019/03/31

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    We advanced the understanding of the deformation process before and after the 2011 Tohoku-oki earthquake and the generation processes of the large inland earthquakes by reproducing them through numerical modeling. (1) We analyzed and modeled postseismic deformation of the Tohoku-oki earthquake, and reproduced the forearc subsidence in around 100 years before the earthquake and the stress field before and after the earthquake. (2) We analyzed the crustal deformation data of the Japanese island arc, and clarified the strain concentration zones and major fault movements in southwest Japan. We also clarified that the strain concentration process in each region of the Japanese island is controlled by thermal anomaly, crustal fluid, and geological structure. (3) We succeeded in modeling the earthquake cycle by considering fault rheology such as brittle-ductile transition and pressure solution creep, and in reproducing the dynamic rupture propagation of the recent large inland earthquakes.

  7. Experimental challenge to estimate frictional properties of a plate boundary based on microseismicity

    Yabe Yasuo

    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

    2015/04/01 - 2018/03/31

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    Normal stress dependencies of evolution of the rate effect on frictional strength and AE activity were examined by laboratory experiments using granite specimens. For cumulative sliding distance smaller than a critical distance, the rate dependency of friction is positive, while that of the b-value of AE activity is negative. When the cumulative sliding distance reaches the critical distance, the rate dependence of friction turns to negative. At the same time, the rate dependence of the b-value of AE activity becomes negative. Higher the normal stress, the critical distance becomes smaller. The evolutions of rate effects on the friction and the AE activity can be approximated by an exponential function to estimate a characteristic sliding distance required to reach a steady state. The characteristic sliding distance is inversely proportional to the normal stress, suggesting a work done by external force to evolve fault surface topographies by wear is independent of the normal stress.

  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

    2009/05/11 - 2014/03/31

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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

    2009/04/01 - 2014/03/31

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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. Very high frequency seismology in deep South African gold mines - from1 cm to 200 m

    MASAO Nakatani, YOSHIDA Shingo, MIYAKE Hiroe, IGARASHI Toshihiro, KATO Aitaro, SANO Osamu, IIO Yoshihisa, KAWAKATA Hironori, OGAWASARA Hiroshi, IDE Satoshi, SATO Takashi, YABE Yasuo, RAI Kyorin, OTSUKI Kenshiro, HIRAMATSU Yoshihiro, NAOI Makoto, KATSURA Taishi, DRESEN Dresen, STANCHITS Sergei, PLENKERS Katrin, KWIATEK Grzegorz, PHILIPP Joachim, MOREMA Gilbert, WARD Tony, ASWEGEN Gerrie Van, CARSTENS Riaan, MILLER Clive

    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

    2006 - 2008

  11. Estimates of Fault Strength, Frictional Heat, and Energy for the Chi-Chi, Taiwan Earthquake

    MORI James Jiro, ITO Hisao, SHIMAMOTO Toshihiko, MATSUBAYASHI Osamu, TANAKA Hidemi, YABE Yasuo

    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: KYOTO UNIVERSITY

    2004 - 2006

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    The main purpose of this project was to look for a temperature anomaly associated with faulting from the 1999 Chi-Chi, Taiwan earthquake (Mw7.6) on the Chelungpu fault. Any temperature change across the fault would give an estimate of the frictional heat produced at the time of the earthquake. Determining the level of frictional heat adds valuable information to a long-standing problem in seismology about the absolute stress levels and strengths of faults during large earthquakes. For the temperature measurements we able to use the Taiwan Chelungpu fault Drilling Project (TCDP) borehole which penetrated the fault at a depth of about 1100 meters in a region of large slip. Using a high-resolution borehole instrument developed in this project, we measured continuous temperature profiles in the borehole in September 2005. The results, which were obtained 6 years after the earthquake, showed a small increase of temperature across the fault. This small temperature signal is interpreted as the residual frictional heat from the time of the earthquake. The modeled temperature data showed that a shear stress level of 0.8 to 1.7 MPa on the fault during the rupture. This value corresponds to an apparent coefficient of friction of 0.08 to 0.1, which is a very low value. If this is a representative value for the area of large faulting, significant low friction mechanisms are needed to explain the faulting. Material properties, such as variations in heat conductivity, may affect the interpretation of the temperature signal. Investigating these effects is the purpose of a follow-up project. Other studies in the project investigated physical properties of the fault zone from the borehole cores and a water pumping test was done to determine the fluid flow properties.

  12. 地震活動の時空間変動に基づく摩擦特性の推定のため基礎的研究

    矢部 康男

    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

    2004 - 2006

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    本研究では,既存断層のすべりに伴うAE活動や断層の摩擦特性が,すべり速度の変化や大変位のすべりに伴いどのように変化するのかをあきらかにするため,回転式せん断すべり試験機を用いて室内摩擦すべり実験をおこなう. 平成16年度に,別経費で設計・製作した回転式低速せん断すべり試験機の実装に伴う問題の解決を行った.平成17年度には,岩石試料を用いた実験をおこない,過去に直接せん断試験機を用いておこなった実験の結果との比較をおこなった.回転式低速せん断すべり試験機を用いた実験でえられたデータは,過去のデータと概ね一致していたが,細部に相違点が認められた.今年度前半は,この相違の原因の検討を行った.その結果,変位の計測に用いていたロータリーエンコーダの信号・雑音比が低く,変位量を正確に測定できていないことが判明した.そこで,より雑音が小さいエンコーダを取り付けられるよう装置を改良した.岩石実験室の壁面・天井にアスベスト含有のおそれがある吹き付け材が使用されていることが明らかになり,その除去工事のため,12月以降,実験室が閉鎖され,十分な実験をおこなうことができなかったが,試験機の性能は十分満足のいくものとなったことを確かめた. エンコーダの変更と平行して,波形の相関解析から,すべりに伴って発生する相似イベントを検出することを目指して,AE原波形の収録と効率的な波形解析の準備をおこなった.相似イベントの予備的な解析では,相関係数が0.8以上のイベント対の数が,相関係数がそれ以下のものに比べて相対的に大きくなっていることが示唆されており,室内での摩擦すべりにおいても,プレート境界で推定されているような小アスペリティの繰り返し破壊が発生している可能性がある.このことは,以前の実験結果と矛盾しない.

  13. Mapping of asperities and estimation of spatiotemporal distribution of interplate slip

    HASEGAWA Akira, UMINO Norihito, MATSUZAWA Toru, MIURA Satoshi, OKADA Tomomi, YABE Yasuo

    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

    2003 - 2006

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    In this research, we have been aiming to analyze details of lock and slip on the plate boundary under the Pacific Ocean in NE Japan and to understand the generation mechanism of interplate earthquakes. The main research contents are: 1. analysis of repeating earthquakes, 2. analysis of source process of medium ＆ large earthquakes based on broadband seismic waveform data, 3. GPS data analysis, 4. research on the property of asperities by using numerical simulation. According to the result of 1. analysis of repeating earthquakes, we successfully estimated the time variation of interplate slips around the rupture zone of the 2003 Tokachi-oki earthquake, by identifying the repeating earthquakes in all parts of the plate boundary under the Pacific Ocean from Hokkaido to NE Japan. As for the 2. analysis of source process based on seismic waveform data, we showed that the rupture area of Miyagi-oki earthquake (M7.2) on Aug. 16, 2005 is overlapped with the southeastern part of the rupture area of the 1978 Miyagi-oki earthquake. So, this means that the asperities of the 1978 earthquake located in the north and west part are left unruptured; our research pointed out the importance of continued and careful observation on this area. Moreover, we conducted reanalysis of aftershocks of Miyagi-oki earthquakes with magnitude >7 in 1930s, and found out that three asperities could have slipped separately, in three times, in the case of 1930s' Miyagi-oki earthquakes. With 3. GPS analysis, after 2005 Miyagi-oki earthquake, we detected the after slip which spread toward south of the rupture area of the event. This observation result corresponds with the result of seismic-waveform inversion analysis; the northern and western asperities are left unruptured. The result of 4. numerical simulation analysis shows that, in order to explain the propagation velocity of the after slip observed in the deep plate boundary close to land, pore pressure around the plate boundary should be extremely large. On the other hand, in order to explain the propagation velocity of the after slip observed in the shallow plate boundary close to the trench, large pore pressure is not necessary like in the case above. These results suggest the depth variation in the amount of water supplied to the plate boundary, which was caused by dehydration reaction, or the depth variation in coefficient of permeability around the plate boundary. As mentioned above, through this research, we have achieved substantial results to enhance understanding of the generation mechanism of interplate earthquakes.

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Social Activities 9

  1. 地震学夏の学校2009「地震発生予測モデルの作り方」

    2009/08/04 - 2009/08/06

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    全国の大学の学部生・修士学生を対象として，地震発生予測モデルに関する基礎から現状，今後の研究の展望を，関連分野の第一線の研究者を講師に招いて，合宿形式でセミナーを行う．

  2. Science

    2017/05/31 -

  3. IODP/ICDP成果報告会

    2017/03/21 -

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    講演者：矢部康男 講演タイトル：地震を間近で見る -南アフリカ⾦鉱⼭での地震観測と断層掘削-

  4. 震源直近，動き探る 南アの金鉱，日本人チーム挑戦

    2013/08/26 -

  5. メガクエイク

    2010/01/10 -

  6. 仙台ライフライン防災ネットワーク10周年記念行事

    2010/01/10 -

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    仙台ライフライン防災ネットワーク10周年を記念して，加盟機関の活動を一般市民に紹介する．

  7. 岩石破壊実験デモンストレーション

    2007/06 -

  8. 岩石破壊実験デモンストレーション

    2005/09/05 -

  9. 岩石破壊実験デモンストレーション

    2005/09 -

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    東北大学総合学術博物館，地震・噴火予知研究観測センターが主催して，仙台市科学館で開催された「地震展」において，見学者に地震の前兆現象を体感してもらうためのデモンストレーションとして岩石破壊実験をおこなった．

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Media Coverage 1

  1. Seismicity research into deep impacts

    Mining Mirror

    2014/05

    Type: Newspaper, magazine

Other 14

  1. 低速リング剪断試験による断層変位量と ESR 信号強度の評価

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    断層運動により発生する摩擦熱や地熱による影響が小さいため，高温になるとは考えにくい地殻浅所での断層運動を想定したESR信号強度のゼロセットに関する研究

  2. 岩塩を用いた摩擦実験による脆性―塑性遷移域の破壊伝播特性の解明

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    岩塩をガウジとして用いた摩擦実験により，脆性―塑性遷移域における破壊伝播特性を解明する．

  3. 卓上版震源決定体験装置

  4. 鉱山での地震被害低減のための観測研究

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    高感度・高精度のＡＥ観測で，被害地震の震源断層を事前にとらえる．断層極近傍の高感度歪観測で較 正することで，採掘進行に伴う応力変化の数値予測精度を向上する．非弾性変形や前駆すべりの開始をＡＥ活動や歪の変化で検知する．以上を現行の鉱山地震発生予測ルーチン処理に統合する．断層直近での動的応力計測により，強震動の生成機構を解明する．ＡＥの余震観測で正確に描写された本震破壊域にもとづき，より正確に応力再配分を推定し，後続地震の予測精度を高める．

  5. 動的応力変化計

  6. 南ア金鉱山AEデータ解析システム

  7. 室内版自動震源決定システム

  8. 地震発生に伴う応力蓄積・再配分過程の断層極至近距離での現場測定

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    南アフリカ金鉱山のひとつのタウトナ鉱山では，2007年から2年程度の間に，深度3100m付近において，大規模な採掘が予定されている．この採掘の予定地域近くには過去にM2級の地震が発生した断層(バンク断層)が存在する．2007年からの採掘により，バンク断層周辺の応力が高まるので，バンク断層が再活動し，活発な地震活動が発生すると期待されている．バンク断層周辺には，いくつかの坑道が整備されていて，断層から数十ｍまで近づくことができる．本計画では，これらのトンネルから掘削をして，断層から数ｍ以内に歪計を埋設し，地震発生に先行する応力蓄積過程と，地震発生後の応力再配分過程を断層直近で現場測定することを試みる．

  9. 南アフリカ金鉱山における半制御地震発生実験のための観測網構築

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    自然地震は，断層長にして数桁にわたる範囲でGutenberg-Richterの関係が成り立つなど，極めて自己相似性の顕著な破壊現象である．地震活動が顕著な自己相似性を示す背景には，地震発生を支配する物理法則そのものに自己相似性があるためであると考えられている．しかし，自然地震がどのような状況(断層の幾何学や載荷条件)で発生するのかはよくわかっていない．一方，発生状況を制御可能で，発生過程を詳細に観察できる室内実験のAEも自然地震と類似した自己相似性を示すが，それが自然地震の自己相似性と同一のものであるかは不明である．色々な意味(発生状況や観測可能性)で，両者の中間的な性質をもつ南ア金鉱山で発生する鉱山地震の自己相似性を明らかにできれば，室内実験の知見と自然地震の観測事実を結びつけることができる．これにより，自然地震の発生過程を支配する物理法則を明らかにする糸口がつかめるであろう．

  10. 鉱山内極微小地震観測用センサー圧着用スプリング機構

  11. Semi-controlled earthquake generation experiment at South Africa deep gold mine

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    地震破壊を至近距離でとらえることができる鉱山の特徴を活かすため、観測周波数帯域を従来の2kHzから、一気に170kHzまでのばし、期待される地震の最大サイズ(200 m)から、実験室における微小破壊活動（アコースティックエミッション、以下AE）に比する1 cmサイズの破壊までを同一条件で捉えて、地震のスケーリングの物理を解明する。孤立したイベントとして起こる微小破壊の活動パターンを調べ、自然地震、岩石破壊実験と比較するとともに、比較的大きな地震破壊の様子を高周波数までの情報を使って観察することで、地震破壊の階層構造を明らかにする。

  12. 可搬型岩石破壊実演装置

  13. low velocity rotally shear apparatus

  14. system for in-situ stress measurment using core samples

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