2009 Fiscal Year Final Research Report
Why do earthquakes occur? -to clarify the true role of crustal fluids-
| Project/Area Number |
19204043
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Kyoto University |
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Principal Investigator |
IIO Yoshihisa Kyoto University, 防災研究所, 教授 (50159547)
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| Co-Investigator(Kenkyū-buntansha) |
OSHIMAN Naoto 京都大学, 防災研究所, 教授 (70185255)
YOSHIMURA Ryokei 京都大学, 防災研究所, 助教 (50346061)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 水 / 地震波速度 / 比抵抗 / 内陸地震 / 長野県西部 / 応力 / 非弾性変形 / 断層 |
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| Research Abstract |
To clarify the true role of crustal fluids, we investigated the relationship between the hypocentral distribution and the three dimensional velocity and resistivity structures in the Western Nagano Prefecture region. We found that earthquakes occur along small-scale low velocity zones in high velocity regions surrounded by large-scale low velocity and low resistivity regions. It is thought that in the large-scale low velocity and low resistivity regions, anelastic deformation occurs under a relatively low pore pressure, but that in the large-scale low velocity and low resistivity regions, high speed slips are generated on faults and earthquakes occur under a high pore pressure.
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