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《Acta Geodaetica et Cartographica Sinica》 2009-02
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Wenchuan Earthquake Deformation Fault Inversion and Analysis Based on GPS Observations

LI Zhi-cai1, ZHANG Peng1, JIN Shuang-gen2, JIANG Zhi-hao1, WEN Yang-mao31. Department of Geodesy, National Geomatics Center of China, Beijing 100044, China; 2. Center for Space Research, University of Texas at Austin, TX 78759, USA; 3. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China  
The May 12th 2008 Wenchuan earthquake (Mw=8.0) caused many people death and economic lost in Sichuan Province. The surface observation data were rapidly obtained using GPS technology by the State Bureau of Surveying and Mapping (SBSM) and China Earthquake Administration (CEA) after the earthquake broking. In this paper, the reliable co-seismic deformation field is derived from GPS measurements using the highly precise data processing method. The larger deformations are in Wenchuan, Qingchuan and Beichuan Counties rather in the epicenter, while the largest magnitude is up to 2.3m in the horizontal and 0.7m in the vertical direction in Beichuan. The co-seismic fault slip distributions are further inverted using the elastic half-space homogeneous model with distributed slip model. The inversion results show that the non-constrained fault slip is most according with the GPS observed co-seismic deformation and the seismic fault is not only right-lateral and thrust slip, but also with a little left-lateral slip and normal slip slide. The moment tensor is about 2.38X1021N·M and the main forwardly-inverted co-seismic deformations are in Dujianyan-Wenchuan county and also in Beichuan, Qingchuan areas at the greatest deformation of about 4.5m in the east direction and 0.8m in the north direction with a strongly right-lateral characteristic, which are almost consistent with the wide geological survey results.
【Fund】: 国家自然科学基金(40574006);; 国家863科技项目(2006AA12Z323;2007AA12Z316);; 国家公益性行业(地震行业)科研专项(200808080)
【CateGory Index】: P227
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