Focal Mechanism Solution of the February 23,2014,M_L3.8 Rongchang Earthquake with the CAP(Cut and Paste)Method

查看全文 作　　者：Wang [1]Xiaolong;Lei [2]Xinglin;Guo [1]Xing;Yu [1]Tianhang;Gou [1]Xianbin;Yu [1]Gouzheng

机构地区：[1]Earthquake Administration of Chongqing Municipality,Chongqing 401147,China;[2]Geological Survey of Japan,AIST,Tsukuba 305-8567,Japan

出　　处：《Earthquake Research in China》索引2016年第30卷第2期,共7页

基　　金：funded jointly by the Scitech R&D Program of Chongqing Municipality(cstc2014yykfA00002(cstc2014yykfA0234),cstc2014jccxA0028 and cstc2013ggB0011);the Spark Program of Earthquake Sciences of CEA(Grant No.XH14042) 摘　　要：A M_L3.8 earthquake occurred on February 23,2014 in Rongchang County,which is located at the southern edge of the Sichuan Basin in the border area between Sichuan and Chongqing. This paper presents results of focal mechanism solution of this earthquake using the CAP( cut and paste) method based on broadband seismograms recorded by regional seismic stations. Our results show that the moment magnitude is M_W3. 09 and focal depth is 3km. The hypocenter of this earthquake is located close to a buried fault in the Luoguangshan anticline. Oil prospecting and deep drilling data indicate that this buried fault is a thrust fault,striking SW230°,dipping NW45°,and 1. 7km deep. There are some injection wells within the anticline,and significant injection-induced earthquakes were observed during the periods of injection of waste water into the deep formations through those wells. The best double couple solution of the M_L3.8 earthquake is 247°,48°and 104° for strike,dip and rate,respectively,for one nodal plane( and 46°,44° and 74°for another nodal plane),which is in agreement with the geometry of the buried fault.Therefore,we conclude that the M_L3.8 Rongchang earthquake is possibly the result of faulting along the buried reverse fault induced by water injection under the compressive stress regime in the area. 关键词：震源机制解 8级地震荣昌县粘贴剪切逆冲断层隐伏断层地震台站

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Focal Mechanism Solution of the February 23,2014,M_L3.8 Rongchang Earthquake with the CAP(Cut and Paste)Method

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