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《Chinese Journal of Geophysics》 2010-12
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Focal mechanism solutions of M_L≥4.0 events in the M_S6.1 Panzhihua-Huili earthquake sequence of Aug 30, 2008

LONG Feng ~(1,3) , ZHANG Yong-Jiu~(3*) , WEN Xue-Ze~(2,3),NI Si-Dao~1 , ZHANG Zhi-Wei~3 1 School of Earth and Space, University of Science and Technology of China , Hefei 230026, China 2 Institute of Earthquake Science, China Earthquake Administration , Beijing 100036, China 3 Earthquake Administration of Sichuan Province, Chengdu 610041, China  
For the M_S 6. 1 Panzhihua-Huili, Sichuan, earthquake sequence of Aug 30, 2008, this study determines the focal mechanism solutions of the mainshock event and the M_L≥4. 0 aftershock events in the sequence using the CAP method and the broadband waveform records from the digital seismic networks of Sichuan and Yunnan. The result shows that the focal mechanism solution of the mainshock has two principal stress axes with low dip angles of 10°, and the principal compressive stress axis trends 140°. One of the two nodal planes of the focal mechanism solution of the mainshock strikes in 185°, dips westward at 83°, has a rake of 5°, and shows left-lateral strike-slip faulting with a small thrust component. This nodal plane has been identified to be representative of the seismogenic fault plane of the mainshock by considering the distributions of the aftershocks and the seismic intensities, as well as the local active geologic structure. The corresponding seismogenic fault has been determined to be the nearly N-S-trending Hongge fault (its southern segment) running through the epicentral area of the sequence. The best misfit depth of the mainshock s focal mechanism solution is estimated to be 10 km, being consistent with the located depth of this event. It is also found that the other 6 M_L≥4. 0 aftershocks have similar focal mechanism solutions with that of the mainshock. A preliminary analysis suggests that spatially the focal mechanism solutions of the M_S 6. 1 Panzhihua-Huili earthquake sequence of 2008 are coordinated with those of the previous events in the study region. This reflects that the 2008 sequence has been resulted from the left-lateral strike-slip faulting with a thrusting component along the nearly N-S-trending Hongge fault, under the SE- to SSE-ward horizontal motion of the Sichuan-Yunnan massif.
【Fund】: 中国地震局监测预报司“中国大陆7、8级地震中-长期危险性预测研究”专项;; 中国地震局监测预报司“数字地震学短临预报方法研究”专项资助
【CateGory Index】: P315.33
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