2012 Fiscal Year Final Research Report
Development and application of data assimilation methods for GPSdata to estimate frictional properties on plate boundary faults
| 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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| Keywords | データ同化 / GPS / 断層すべり / 摩擦法則 / 摩擦パラメータ |
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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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Research Products
(13 results)
