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《地质学报(英文版)》 2016-02
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The Seismogenic Structure and Deformation Mechanism of the Lushan(M_W 6.6) Earthquake, Sichuan, China

ZHOU Rongjun;LI Yong;SHAO Chongjian;SU Jinrong;YAN Zhaokun;YAN Liang;Sichuan Earthquake Administration;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology;  
On April 20 th, 2013, an earthquake of magnitude MW 6.6 occurred at Lushan of Sichuan on the southern segment of the Longmenshan fault zone, with no typical coseismic surface rupture. This work plotted an isoseismal map of the earthquake after repositioning over 400 post–earthquake macro–damage survey points from peak ground acceleration(PGA) data recorded by the Sichuan Digital Strong Earthquake Network. This map indicates that the Lushan earthquake has a damage intensity of IX on the Liedu scale, and that the meizoseismal area displays an oblate ellipsoid shape, with its longitudinal axis in the NE direction. No obvious directivity was detected. Furthermore, the repositioning results of 3323 early aftershocks, seismic reflection profiles and focal mechanism solutions suggests that the major seismogenic structure of the earthquake was the Dayi Fault, which partly defines the eastern Mengshan Mountain. This earthquake resulted from the thrusting of the Dayi Fault, and caused shortening of the southern segment of the Longmenshan in the NW–SE direction. Coseismal rupture was also produced in the deep of the Xinkaidian Fault. Based on the above seismogenic model and the presentation of coseismic surface deformation, it is speculated that there is a risk of more major earthquakes occurring in this region.
【Key Words】: Lushan earthquake southern segment of Longmenshan seismogenic structure seismic risk
【Fund】: China Seismic Active Fault Exploration Central–South Segment Project of North–South Seismic Belt National Natural Science Foundation of China(grants No.41340005 41372114 41172162 40972083 41502116 and 41402159);; the Research Project of Sichuan Education Department(grant No.15ZB0085)for their joint funding
【CateGory Index】: P315.2
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