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《Chinese Journal of Geophysics》 2012-10
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Focal mechanism solutions of 2003 Delingha,Qinghai,M6.7 earthquake sequence and its tectonic implication

SUN Chang-Hong1,XU Feng2,YANG Yu-Bo2,QIAN Rong-Yi2,MENG Xiao-Hong2 1 Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China 2 School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China  
Using digital seismic records from 8 portable stations and from stations of National Digital Seismic Network,we have measured the polarities and amplitude ratios of direct P,SH and SV waves of 2003 Delingha,Qinghai,M6.7 earthquake and its aftershocks.Applying Snoke′s(2003) grid search algorithm we determined focal mechanism solutions of 48 M≥2.4 earthquakes.We also analyzed Harvard focal mechanism solutions of the Delingha mainshock and 7 late aftershocks.Our study result shows that the mainshock and most aftershocks have a reverse faulting mechanism with fault strike in NWW—SEE and the northern hanging wall moving southward and upward.Two normal faulting aftershocks may come from possible tensile fractures in front part of the compressive thrust arc.During the second phase of earthquake activity in 2004 the motion of main thrust fault might have induced rupture of some strike-slip faults in eastern part of the source region.The Delingha earthquakes are located in a wide NWW—SEE trend compression zone in northeastern Qinghai-Xizang plateau region,and the present-day uplift of this compression zone serves as the seismogenic origin of the Delingha earthquake sequence.
【Fund】: 中国国土资源部科研专项(20010201)资助
【CateGory Index】: P315.33
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