Tectonic Mechanism of the Suining(Ms5.0) Earthquake,Center of Sichuan Basin,China  

作　　者：ZHOU Rong-jun LI Yong Laurence SVIRCHEV ZHANG Yong-jiu HE Deng-fa HE Yu-lin ZHAO Pei-lin WANG Zan-jun LONG Feng SU Jin-rong WANG Shi-yuan LIANG Ming-jian LIU Yu-fa KANG Chuan-chuan 

机构地区：[1]Earthquake Administration of Sichuan Province [2]National Key Laboratory of Oil and Gas Reservoir Geologyand Exploitation,Chengdu University of Technology [3]Royal Roads University,School of Peace and Conflict Management [4]China University of Geoscience [5]Earthquake Administration of Chongqing Municipality

出　　处：《Journal of Mountain Science》2013年第1期84-94,共11页山地科学学报（英文）

基　　金：the National Natural Science Foundation of China (Grant No. 40841010,40972083,41172162);the National Science and Technology Support Program (Grant nNo. 2006BAC13B02-107,2006BAC13B01-604) for the funding

摘　　要：On Jan.31 of 2010,the Suining earthquake occurred at Suining City whch is located the center of Sichuan Basin.It is unusual for the strong earthquake to occur at the center of Sichuan Basin with a stable geotectonic environment and a low-level historical seismicity.The macro-epicenter of the earthquake is located at Moxi town of Suining city,Sichuan province,China.The earthquake intensity of the epicenter area is degree VII,and the long axis of the isoseismal line trends in NE orientation.The Suining earthquake caused the collapse or destruction of 460 family houses.The earthquake focal mechanism solution and records of the near-field seismographic stations showed the earthquake occurred at the reverse fault at a depth 34 km.Based on the waveform and focal mechanism,we consider the Suning earthquake is triggered by the reverse fault and not by the gravitational collapse or man-made explosive sources.Basing on seismic refraction profile and borehole,we consider that the earthquake is triggered by the backthrust fault of Moxi anticline rooted in detachments at a depth 3-4 km.Furthermore,we infer that tectonic mechanism of the Suining(Ms5.0) Earthquake is driven by the horizontal crustal shortening and stress adjustment on a shallow detachment after the Wenchuan(Ms 8.0) earthquake.

关 键 词：Suining（Ms5.0） earthquake Disaster Tectonic mechanism Horizontal crustal shortening Backthrust fault Shallow detachment Sichuan Basin 

分 类 号：P315[天文地球—地震学]