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《Chinese Journal of Geophysics》 2013-08
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Rupture characteristics and seismogenic structures of the M_s5.7 and M_s5.6 Yiliang earthquakes of Sep.7,2012

Lü Jian1,ZHENG Xiu-Fen2,XIAO Jian1,XIE Zu-Jun3*, ZENG Xin-Fu1,LI Bin1,DONG Fei-Fei1 1 Earthquake Administration of Jiangxi Province,Nanchang 330039,China 2 Institute of Geophysics,China Earthquake Administration,Beijing 100081,China 3 State Key Laboratory of Geodesy and Earth's Dynamics,Institute of Geodesy and Geophysics, Chinese Academy of Sciences,Wuhan 430077,China  
Based on the records of CSN and regional digital seismic networks,we obtained the focal depth and focal mechanism of the Ms5.7 and Ms5.6 Yiliang earthquakes of Sep.7,2012 with the "Cut and Paste"(CAP) method,and used the teleseismic depth phases like P,PP,and SP from IRIS records to determine the focal depth.Further,we analyzed the rupture characteristics and seismogenic structures of the Yiliang earthquakes combining with the earthquake epicenters,seismic intensity,and geologic settings in the region.Our result shows that the best double couple solution of the Ms5.7 event is 243°,62°,and 149° for strike,dip,and rake angles respectively,the other nodal plane is 349°,63°,and 32°;for the Ms5.6 event the solution is 241°,37°,162° with the other nodal plane of 346°,79°and 54°.We infer that both of the Ms5.7 and Ms5.6 earthquakes occurred on the NE striking Shimen fault and the focal depths of the events are about 6 km,the released seismic energy was concentrated in shallower crust which is an important reason for the serious seismic damage in the region.
【Fund】: 地震科技星火计划项目(XH12027);; 国家自然科学基金(41174086)联合资助
【CateGory Index】: P315
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