2013 Fiscal Year Annual Research Report
| Project Area | New perspective of great subduction-zone earthquakes from the super deep drilling |
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| Project/Area Number |
21107004
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| Research Institution | Chiba University |
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Principal Investigator |
金川 久一 千葉大学, 理学(系)研究科(研究院), 教授 (40185898)
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| Co-Investigator(Kenkyū-buntansha) |
高橋 美紀 独立行政法人産業技術総合研究所, その他部局等, 主任研究員 (40470033)
廣瀬 丈洋 独立行政法人海洋研究開発機構, その他部局等, サブリーダー (40470124)
堤 昭人 京都大学, 理学(系)研究科(研究院), 助教 (90324607)
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| Project Period (FY) |
2009-07-23 – 2014-03-31
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| Keywords | 南海トラフ地震発生帯 / 日本海溝プレート境界断層 / 掘削試料 / 摩擦実験 / 透水実験 |
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| Research Abstract |
１）南海トラフ付加体浅部の砂岩、凝灰岩、シルト質泥岩および粘土質泥岩の4試料について、掘削地点C0002の海底下1 km条件（温度42℃、封圧37 MPa、間隙水圧29 MPa）、および軸方向変位速度1 μm/sで三軸摩擦実験を行った結果、粘土鉱物含有量の増加に伴って定常摩擦係数が低下し、すべり弱化が明瞭になる傾向が認められた。
２）日本海溝掘削により得られたプレート境界断層浅部、およびその上・下盤の泥質堆積物試料について、有効圧0~40 MPaの下で定差圧流量法により透水実験を行った結果、プレート境界断層試料の原位置深度相当有効圧下の浸透率が上・下盤の堆積物試料より２桁以上も小さかった。プレート境界断層試料と上・下盤の堆積物試料では粘土鉱物含有量に大きな違いがあり、プレート境界断層とその上・下盤の透水性の違いは、粘土鉱物含有量の違いを反映していると考えられる。
３）モンモリロナイト・石英混合ガウジについて、垂直応力5 MPa、変位速度3 μm/s ~ 3 cm/s、含水条件で摩擦実験を行った結果、モンモリロナイトを20~40 wt%含むガウジの摩擦強度の変位速度依存性が15 cm以上の大変位、30 μm/s ~ 3 mm/sの速度範囲で負となることが明らかとなった。変位量の増加に伴う断層内部組織の変化によって、速度強化から速度弱化へと変化した可能性がある。
４）藍閃石片岩ガウジについて、温度20~400℃、有効垂直応力20~200 MPa、変位速度0.1~100 μm/sで摩擦実験を行った結果、摩擦強度の変位速度依存性が温度上昇に伴って低下し、有効垂直応力の増加に伴って増加する傾向が認められ、200℃では全有効垂直応力下で速度弱下となり、150 MPa以上では多くの温度条件で速度強化となった。以上の結果は、玄武岩を母岩とする断層が、震源域では低有効垂直応力下、すなわち高間隙水圧下ですべりが不安定で固着すべりを起こしやすいことを示唆している。
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| Current Status of Research Progress |
Reason
25年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
25年度が最終年度であるため、記入しない。
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[Journal Article] IODP Expedition 338: NanTroSEIZE Stage 3: NanTroSEIZE plate boundary deep riser 22014
Author(s)
Moore, G. F., Kanagawa, K., Strasser, M., Dugan, B., Maeda, L., Toczko, S. and the IODP Expedition 338 Scientific Party
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Journal Title
Scientific Drilling
Volume: 17
Pages: 1-12
DOI
Peer Reviewed
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[Journal Article] NanTroSEIZE Stage 3: NanTroSEIZE plate boundary deep riser 22014
Author(s)
Strasser, M., Dugan, B., Kanagawa, K., Moore, G. F., Toczko, S., Maeda, L. and the Expedition 338 Scientists
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Journal Title
IODP Proceedings
Volume: 338
Pages: 1-633
DOI
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[Journal Article] Helium anomalies suggest a fluid pathway from mantle to trench during the 2011 Tohoku-Oki earthquake2014
Author(s)
Sano, Y., Hara, T., Takahata, N., Kawagucci, S., Honda, M., Nishio, Y., Tanikawa, W., Hasegawa, A. and Hattori, K.
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Journal Title
Nature Communications
Volume: 5
Pages: 1-6
DOI
Peer Reviewed
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[Journal Article] Hydraulic and acoustic properties of the active Alpine Fault, New Zealand: Laboratory measurements on DFDP-1 drill core2014
Author(s)
Carpenter, B. M., Kitajima, H., Sutherland, R., Townend, J., Toy, V. G. and Saffer, D. M.
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Journal Title
Earth and Planetary Science Letters
Volume: 390
Pages: 45-51
DOI
Peer Reviewed
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[Journal Article] Importance of mechanochemical effects on fault slip behavior during earthquakes2013
Author(s)
Hirono, T., Tanikawa, W., Honda, G., Kameda, J., Fukuda, J. and Ishikawa, T.
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Journal Title
Geophysical Research Letters
Volume: 40
Pages: 2988-2992
DOI
Peer Reviewed
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[Journal Article] NanTroSEIZE Stage 3: NanTroSEIZE plate boundary deep riser 32013
Author(s)
Hirose, T., Saffer, D. M., Tobin, H. J., Toczko, S., Maeda, L., Kubo, Y., Kimura, G., Moore, G. F., Underwood, M. B. and Kanagawa, K.
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Journal Title
IODP Scientific Prospectus
Volume: 348
Pages: 1-36
DOI
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[Journal Article] Low coseismic shear stress on the Tohoku-Oki megathrust determined from laboratory experiments2013
Author(s)
Ujiie, K., Tanaka, H., Saito, T., Tsutsumi, A., Mori, J. J., Kameda, J., Brodsky, E. E., Chester, F. M., Eguchi, N., Toczko, S. and Expedition 343 and 343T Scientists
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Journal Title
Science
Volume: 342
Pages: 1211-1214
DOI
Peer Reviewed
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[Presentation] Frictional behavior and BET surface-area changes of SAFOD gouge at intermediate to seismic slip rates
Author(s)
Sawai, M., Shimamoto, T., Mitchell, T., Kitajima, H. and Hirose, T.
Organizer
European Geosciences Union General Assembly 2013
Place of Presentation
Austria Center, Vienna, Austria
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[Presentation] Frictional melting and stick-slip behavior in volcanic conduits
Author(s)
Kendrick, J. E., Lavallee, Y., Hirose, T., Di Toro, G., Hornby, A. J., Hess, K.-U. and Dingwell, D. B.
Organizer
European Geosciences Union General Assembly 2013
Place of Presentation
Austria Center, Vienna, Austria
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[Presentation] New access to the deep interior of the Nankai accretionary complex and comprehensive characterization of subduction inputs and recent mega splay fault activity (IODP-NanTroSEIZE Expedition 338)
Author(s)
Strasser, M., Moore, G. F., Kanagawa, K., Dugan, B., Fabbri, O., Toczko, S., Maeda, L. and the IODP Expedition 338 Scientists
Organizer
European Geosciences Union General Assembly 2013
Place of Presentation
Austria Center, Vienna, Austria
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[Presentation] Initiation and runaway process of Tsaoling landslide, triggered by the 1999 Taiwan Chi-Chi earthquake, as studied by high-velocity friction experiments
Author(s)
Togo, T., Shimamoto, T., Dong, J.-J. and Lee, C.-T.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
Invited
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[Presentation] Frictional melting dynamics in the upper conduit: A chemical answer to a complex physical question
Author(s)
De Angelis, S. H., Lavallee, Y., Kendrick, J. E., Hornby, A., von Aulock, F. W., Clesham. S., Hirose, T. and Perugini, D.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] IODP Expedition 338: Riser and riserless drilling along the NanTroSEIZE transect
Author(s)
Strasser, M., Moore, G. F., Dugan, B., Kanagawa, K. and Toczko, S.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] Physical properties and Consolidation behavior of sediments from the N. Japan subduction zone
Author(s)
Valdez, R. D. II, Lauer, R. M., Ikari, M., Kitajima, H. and Saffer, D. M.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] Porosity, pore size, and permeability of sediments from Site C0002, IODP Expedition 338
Author(s)
Dugan, B., Huepers, A., Song, I., Kitajima, H. and Esteban, L.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] Seismogenic frictional melting in the magmatic column as the driving force of stick-slip motion
Author(s)
Kendrick, J. E., Lavallee, Y., Hirose, T., Di Toro, G., Hornby, A., De Angelis, S., De Angelis, S. H., Ferk, A., Hess, K.-U., Leonhardt, R. and Dingwell, D. B.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] Formation process and mechanical property of slickenside
Author(s)
Nishiwaki, T., Ando, J., Hirose, T., Kagi, H. and Ohfuji, H.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] Dehydration of hydrous minerals and formation of nanocrystals by frictional heating in experimental seismic fault zones
Author(s)
Jung, S., Chae, S., Ree, J.-H., Hirose, T. and Kim, J.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] The huge shallow slip during the 2011 Tohoku-Oki earthquake as a result of very low coseismic shear strength of the Japan Trench decollement material
Author(s)
Ujiie, K., Tanaka, H., Saito, T., Tsutsumi, A., Mori, J. J. and Kameda, J.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] Permeability in sediments and their role in large slip near the surface of the plate boundary fault in the Japan Trench
Author(s)
Tanikawa, W., Hirose, T., Mukoyoshi, H., Tadai, O. and Lin, W.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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[Presentation] Biological CO2 conversion to acetate in subsurface coal-sand formation using a high-pressure reactor system
Author(s)
Ohtomo, Y., Ijiri, A., Ikegawa, Y., Tsutsumi, M., Imachi, H., Uramoto, G., Hoshino, T., Morono, Y., Tanikawa, W., Hirose, T. and Inagaki, F.
Organizer
American Geophysical Union 2013 Fall Meeting
Place of Presentation
Moscone Center, San Francisco, USA
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