| Project/Area Number |
22740290
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | データ同化 / GPS / 断層すべり / 摩擦法則 / 摩擦パラメータ / 余効すべり / 摩擦 / プレート境界 / 固体地球物理学 / 測地 / 地殻変動 / 地震 / 逆問題 |
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| Research Abstract |
Spatial and temporal variations in slip on plate boundary faults is primarily governed by frictional properties on faults. To estimate frictional properties on faults, we develop data assimilation methods to estimate parameters in fault friction laws (friction parameters) using GPS data. We apply this method to afterslip following the 2011 Mw 9.0 Tohoku-oki earthquake to estimate frictional properties in the afterslip area. The results show that the friction parameter, which has been estimated to be constant in previous studies, is dependent on slip rate and higher slip rates result in less stable frictional properties.
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