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《Chinese Journal of Geophysics》 2008-01
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Focal mechanisms and seismogenic structures of the M_s5.7 and M_s4.8 Jiujiang-Ruichang earthquakes of Nov. 26, 2005

LV Jian~ 1,2 ,ZHENG Yong~ 3,1 ,NI Si-Dao~1,GAO Jian-Hua~21 University of Science and Technology of China, Hefei 230026,China2 Earthquake Administration of Jiangxi Province,Nanchang 330039,China3 Institute of Geophysics, Chinese Earthquake Adimistration, Beijing 100081,China  
Based on the records of 6 stations in Jiangxi regional seismic network and CSN, we obtained the focal mechanisms of the Ms?5.7 Jiujiang-Ruichang earthquake and its Ms?4.8 aftershock of Nov.26, 2005 with the "Cut and Paste"(CAP) method, and analyzed the seismogenic structure combining with relocation of the aftershock sequence and the geologic settings in the region. Our result shows that the best double couple solution of the Ms?5.7 event is 324°,55°and 18° for strike, dip and rake angles respectively, the other nodal plane is 223°,75° and 144°;for the Ms?4.8 aftershock the solution is 54°, 71°, -160° respectively with the other nodal plane of 317°, 71° and -20°. Complexities can be found from aftershock distribution and source depth of the sequence. After the occurrence of the M_s?5.7 main shock, aftershocks occurred and propagated from SE to NW and from shallower to deeper crust, then they probably encountered an asperity and triggered the Ms?4.8 strong aftershock. This complexity and the different focal mechanisms imply that the two earthquakes may not occur on the same fault, we infer that the Ms?5.7 main shock is caused by the NW striking Yangjishan-Wushan-Tongjiangling fault buried in Ruichang basin and the Ms?4.8 aftershock occurred on the NE striking Dingjiashan-Guilinqiao-Wuning fault in the northwest margin of the basin.
【Fund】: 地震科学联合基金(A07124);; 国家自然科学基金(40604004 40425005);; 地震科学联合基金(606054);; 中国地震局“数字地震资料在短临跟踪中的应用”项目(120602-06-114)资助
【CateGory Index】: P315
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