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《Acta Geodaetica et Cartographica Sinica》 2015-11
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The InSAR Coseismic Deformation Observation and Fault Parameter Inversion of the 2008 Dachaidan M_w6.3 Earthquake

LIU Yang;XU Caijun;WEN Yangmao;HE Ping;School of Geodesy and Geomatics,Wuhan University;Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University;Collaborative Innovation Center for Geospatial Technology;Hubei Subsurface Multi-scale Imaging Key Laboratory,Institute of Geophysics and Geomatics,China University of Geosciences;  
On November 10,2008,an Mw6.3earthquake struck the Dachaidan region of Qinghai Province.The ascending and descending synthetic aperture radar(SAR)data from EnviSat satellite and the differential interferometric SAR(DInSAR)technology are used to extract the coseismic deformation field.The uniform dislocation model is used to determine the fault parameters,the grid iteration method is then used to find the optimal dip angle,and the non-uniform dislocation model is used to obtain the detailed slip distribution simultaneously.The results show that the earthquake uplifts the hanging wall up to~8.5cm and~10cm along the line of sight of the descending and ascending tracks,respectively.The optimal dip angle is 47.9°.The coseismic slip doesn't rupture to the earth surface,and mainly occurs at a depth range from 8.2km to 23.7km,with the maximum and average slip of 0.5mand 0.19 m,respectively.The average rake angle is 104.9°.The inverted earthquake moment is 3.74×1018 N·m,and the moment magnitude Mwis 6.35.
【Fund】: 国家973计划(2013CB733304);; 国家863计划(2013AA122501);; 国家自然科学基金(41404007;41431069;41204010);; 中国博士后科学基金(2013M542062);; 中央高校基本科研业务费专项(2042014kf0055);; 国家测绘地理信息局基础研究基金(13-02-01)~~
【CateGory Index】: P315.7
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