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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2008-04
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A primary analysis of geophysical and geodynamic features of the Wenchuan earthquake in Longmen Mountains,Sichuan,China

LI Zhong-quan1,YING Dan-lin1,GUO Xiao-yu3,LI Hong-kui1,WANG Qi-xiang1,YOU Dong-hua1,WANG Xue-feng1,CHEN Xiao1,CHEN Min11.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;2.St.Louis University,St.Louis,MO 63108,USA  
On 12 May,2008,an earthquake occurred in Longmen Mountains,whose main epicenter is located in Wenchuan of Sichuan.This unexpected hazard is characterized by the huge magnitude,wide affected areas,and the linear distribution of the epicenters.Based on the tectonic geological investigation after the earthquake occurred,the faulting activities triggering the huge earthquake consist of two episodic stages.Oblique-thrusting and reverse-thrusting are the two kinematic features,which are composed of the two components of strike-slip and thrusting.Between them,the strike-slipping occurred first followed by the reverse thrusting,and then the reverse thrusting dominates mostly.Analyzing the multi-stage slickensides on the fault surfaces,there are three episodes of faulting activities.The first episode is characterized by the oblique-thrusting,the second episode is reverse-thrusting,and the third one is the strike-slipping.The direction of σ1 which triggered the earthquake is NW-SE.
【Fund】: 国家自然科学基金资助项目(40573002 40773030);; 四川省构造地质重点学科基金资助项目(SZD0408);; 四川省青年科技基金后续资助项目(08ZQ026-044)
【CateGory Index】: P315.2
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