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)
笠谷 貴史 (独)海洋研究開発機構, 地球内部変動研究センター, ポスドク研究員 (90373456)
久保 篤規 高知大学, 理学部, 准教授 (60403870)
桑原 保人 (独)産業技術総合研究所, 地質情報研究部門, グループ長 (50183801)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥49,660,000 (Direct Cost: ¥38,200,000、Indirect Cost: ¥11,460,000)
Fiscal Year 2009: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2008: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
Fiscal Year 2007: ¥35,880,000 (Direct Cost: ¥27,600,000、Indirect Cost: ¥8,280,000)
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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 / 微小地震 / 低速度異常 / メカニズム解 |
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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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Report
(4 results)
Research Products
(37 results)
