| Project/Area Number |
15H03737
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Osaka University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SHIBAZAKI Bunichiro 独立行政法人建築研究所, 国際地震工学センター, 上席研究員 (20344012)
TSUDA Kenichi 清水建設株式会社, 技術研究所・原子力技術センター, 研究員 (60470324)
TANIKAWA Wataru 独立行政法人海洋研究開発機構, 高知コア研究所, 研究員 (70435840)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
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| Keywords | 南海地震 / 東北地方太平洋沖地震 / 巨大津波 / 地震 / 断層 / 摩擦発熱 / 海溝型地震 |
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| Outline of Final Research Achievements |
Near-trench slip during large earthquakes is an important factor in the generation of destructive tsunamis. The amplitude of the slip is related not only to stress drop and dynamic mechanisms but also to properties of the fault rocks. Here, we constrain the near-trench slip potential of the plate-boundary fault of the Japan Trench and the megasplay fault of the Nankai Trough by integrating laboratory-derived properties of actual fault samples and dynamic rupture simulations. The Nankai Trough fault materials are sandy and have higher permeability and porosity than the clayey materials of the Japan Trench. However, dynamic weakening by thermal pressurization is greater at the Nankai Trough, because of the higher friction and higher interstitial fluid content. Dynamic earthquake rupture simulations reproduced the large slip near the trench observed in the 2011 Tohoku-oki earthquake and suggest that a Nankai Trough earthquake has a strong potential to produce a much larger slip.
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