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《Chinese Journal of Geophysics》 2014-02
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Kinematic characteristics of the source process of the Lushan, Sichuan M_s7.0 earthquake on 20 April 2013

ZHAO Xu;HUANG Zhi-Bin;FANG Li-Hua;LI Qiang;ZHAO Bo;MIAO Chun-Lan;China Earthquake Networks Center;Institute of Geophysics,China Earthquake Administration;National Earthquake Infrastructure Service;  
We employ multistep inversions in the frequency or time domain to infer the kinematic characteristics of the source process of the 2013April 20Lushan,Sichuan Ms7.0earthquake,mainly using regional broadband waves recorded by the China Digital Seismic Network.The focal mechanism solution based on the point-source model indicates that this event occurred on a rupture plane(strike 214°,dip 47°,and rake 96°),showing a high-angle thrust faulting.The centroid in the horizontal direction is located 4.5km southwest of the epicenter(30.303°N/102.988°E),and the best-fitting centroid depth is around 17km.The total scalar moment,M0,is retrieved with an average value of 1.16×1019 N·m(or moment magnitude Mw6.6).We make use of the highfrequency(up to 0.5Hz)data to reconstruct the rupture process,which is not detailed enough but robust.The event is considered as an asymmetric bilateral rupturing with a radius of 15km.The total rupture area is about 706.7km2 with an average slip of nearly 0.231m.Most of theenergy is released within about 8s.From 0sto 3s,the energetic rupture starts at the nucleation center,then propagates bilaterally along the fault plane.After 3s,the rupture mainly extends north-north-east,showing obvious rupture directivity.As a result,the apparent durations at majority of the stations,which lie northeast of the epicenter,become much smaller,and the smallest value is 4s.Finally,the rupturing ends at about 8s.
【Fund】: 地震科技星火计划项目(XH12060Y);; 地震行业科研专项(201208003);; 海洋局行业科研专项(201405026)共同资助
【CateGory Index】: P315
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