2013 Fiscal Year Final Research Report
Mechanical and hydrological properties of mega-earthquake thrusts
| 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 Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Chiba University |
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Principal Investigator |
KANAGAWA Kyuichi 千葉大学, 理学(系)研究科(研究院), 教授 (40185898)
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| Co-Investigator(Kenkyū-buntansha) |
TSUTSUMI Akito 京都大学, 大学院理学研究科, 助教 (90324607)
TAKAHASHI Miki 産業技術総合研究所活断層・地震研究センター, 主任研究員 (40470033)
HIROSE Takehiro 海洋研究開発機構高知コア研究所, 主任研究員 (40470124)
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| Co-Investigator(Renkei-kenkyūsha) |
SHIMAMOTO Toshihiko 海洋研究開発機構高知コア研究所, 招聴上席研究員 (20112170)
TANIKAWA Wataru 海洋研究開発機構高知コア研究所, 主任研究員 (70435840)
KITAJIMA Hiroko 産業技術総合研究所活断層・地震研究センター, 研究員 (60635796)
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| Project Period (FY) |
2009-07-23 – 2014-03-31
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| Keywords | 南海トラフ付加体 / 日本海溝プレート境界断層 / ココスプレート表層堆積物 / 掘削試料 / 摩擦実験 / 破壊実験 / 透水実験 |
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| Research Abstract |
We conducted mechanical and hydrological tests on materials cored from the shallow Nankai Trough accretionary prism, the shallow plate-boundary fault along Japan Trench, and the sedimentary cover on the Cocos plate off Costa Rica. The results revealed that their mechanical and hydrological properties systematically change according to the amount of clay minerals. With increasing amount of clay minerals, frictional strength decreases and the flow component in friction sliding increases. Sediments rich in clay minerals are rather impermeable, and fail slowly.
The shallow plate-boundary fault along Japan Trench is found to be rich in clay minerals and very weak in frictional strength so that seismic slip is easy to propagate through. In addition, it is impermeable so that thermal pressurization likely occurs during seismic slips, which further weakens the fault. These well explain the large slip of the shallow plate-boundary fault during the Tohoku-oki earthquake in 2011.
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[Journal Article] and Expedition 343 and 343T Scientists (2013) 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
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Journal Title
Science
Volume: 342
Pages: 1211-1214
DOI
Peer Reviewed
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[Journal Article] Velocity dependence of shear-induced permeability associated with frictional behavior in fault zones of the Nankai subduction zone2012
Author(s)
Tanikawa, W., Mukoyoshi, H., Tadai, O., Hirose, T., Tsutsumi, A. and Lin, W
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Journal Title
Journal of Geophysical Research
Volume: 117
Pages: B05405
DOI
Peer Reviewed
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[Journal Article] Fault lubrication during earthquakes2011
Author(s)
Di Toro, G., Han, R., Hirose, T., De Paola, N., Nielsen, S., Mizoguchi, K., Ferri, F., Cocco, M. and Shimamoto, T
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Journal Title
Nature
Volume: 471
Pages: 494-498
DOI
Peer Reviewed
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[Presentation] 日本海溝プレート境界断層の鉱物学的特徴2013
Author(s)
亀田 純・氏家恒太郎・廣瀬丈洋・Matt Ikari・Francesca Remitti・清水麻由子・濱田洋平・木村学・Frederick Chester・ジェームズモリ・江口暢久・Sean Toczko・EXP 343 Scientists
Organizer
β本地球惑星科学蓮台2013年大会, SCG63-04
Place of Presentation
幕張メッセ国際会議場
Year and Date
2013-05-22
Invited
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