| Co-Investigator(Kenkyū-buntansha) |
MORITA Sumito 独立行政法人産業技術総合研究所, 地圏資源環境研究部門, 主任研究員 (20358188)
YAMADA Yasuhiro 京都大学, 工学系研究科研究院, 准教授 (20362444)
SAITO Saneatsu 独立行政法人海洋研究開発機構, 海洋掘削科学研究開発センター, グループリーダー (40292859)
HASHIMOTO Yoshitaka 高知大学, 自然科学系, 准教授 (40346698)
NAKAMURA Yasuyuki 独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, グループリーダー代理 (60345056)
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| Budget Amount *help |
¥169,000,000 (Direct Cost: ¥130,000,000、Indirect Cost: ¥39,000,000)
Fiscal Year 2013: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2012: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2011: ¥85,410,000 (Direct Cost: ¥65,700,000、Indirect Cost: ¥19,710,000)
Fiscal Year 2010: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2009: ¥34,450,000 (Direct Cost: ¥26,500,000、Indirect Cost: ¥7,950,000)
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| Research Abstract |
To figure out detailed image and physical properties of the subduction thrust fault system generating large earthquakes and tsunamis, we conducted 2-D/3-D seismic reflection data analysis and also acquired IODP (Integrated Ocean Drilling Program) drill data (core sample and downhole logging) in the Nankai Trough and Japan Trench margins. We revealed 3-D detailed structure, P-wave velocity structure, fault activity, and fluid supplier of the Nankai megasplay fault. High pore fluid pressures of the Nankai shallow megathrust fault play an important role in coseismic slip propagation all the way or nearly all the way to the trench. Moreover, high-resolution seismic reflection and LWD (logging while drilling) data allowed us to define the shallow megathrust fault that generated large tsunamis during the 2011 Tohoku earthquake (M9.0).
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