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《Acta Geodaetica et Cartographica Sinica》 2009-03
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Mw 7.9 Wenchuan Earthquake Slip Distribution Inversion from GPS Measurements

XU Caijun,LIU Yang,WEN Yangmao The Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China  
On 2008 May 12,The Mw 7.9 Wenchuan earthquake along the Longmenshan Fault zone,occured at the eastern margin of the Tibetan Plateau,rupturing the Beichuan-Yingxiu and Guanxian-Jiangyou faults.Based on the segmenting fault model,we derive the fine slip distribution by utilizing a sensitivity-based iterative fitting method(SBIF) to GPS datasets mainly from the Crustal Movement Observation Network of China(CMONOC),with the two models of the homogeneous half space and the stratified crustal structure.The results show:①The coseismic slip distribution still can be inversed reasonably by applying a sensitivity-based iterative fitting method to the relatively minor GPS datasets;② The inversion results considering the stratified crustal structure are superior to them from the homogeneous,half space in the mass;③ The coseismic slip is concentrated to above the 10~19 km depth.There exist five slip peak zones and obvious slip distribution at the lower part of SW Beichuan fault,in line with the field investigations and the aftershocks,also can resolve the GPS observations better;④ The Qingchuan fault experienced distinct right-lateral slip,and the magnitude of mean slip is 1.99 m.However,the Beichuan fault mainly experienced thrust slip,and the magnitude of mean slip is 3.35 m.The magnitude of mean slip for Guanxian fault is 0.65 m;⑤ The inversed moment is 8.74×1020Nm(Mw 7.90),consistent with seismic estimates.
【Fund】: 国家863计划(2009AA12Z317);; 国家自然科学基金及创新群体项目(40874003 40721001);; 国家公益(地震)行业科研专项(200808080)
【CateGory Index】: P315;P228.4
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