Stress changes on major faults caused by 2013 Lushan earthquake and its relationship with 2008 Wenchuan earthquake

作     者：SHAN Bin XIONG Xiong ZHENG Yong JIN BiKai LIU ChengLi XIE ZhuJun HSU HouTze 

作者机构：State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2013年第56卷第6期

页      面：1169-1176页

核心收录：

学科分类：070801[理学-固体地球物理学] 0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0704[理学-天文学] 

基　　金：supported by National Natural Science Foundation of China (Grant Nos.41074052,41204067,41174086 and 41021003) Special Project Seismic Commonwealth Research (Grant No.201308013) Key Development Program of Chinese Academy of Sciences (Grant No.KZZD-EW-TZ-05) 

主　　题：Lushan earthquake Wenchuan earthquake Longmenshan Fault Zone seismic hazard Coulomb failure stress 

摘      要：On April 20, 2013, an Ms7.0 earthquake occurred in Ya an-Lushan region, Sichuan Province, China, killing and injuring morethan one thousand people. Therefore, it is critical to outline the areas with potential aftershocks before reconstruction andre-settlement as to avoid future disasters. Based on the elastic dislocation theory and multi-layered lithospheric model, we calculate the co-and post-seismic stress changes caused by the Wenchuan and Lushan earthquakes to discuss the relationshipbetween Mw7.9 Wenchuan earthquake and Ms7.0 Lushan earthquake, the influences on the distribution of aftershock caused bythe Lushan earthquake, and the stress changes on major faults in this region. It is shown that the Coulomb failure stress increment on the hypocenter of Lushan earthquake caused by the Wenchuan earthquake is about 0.0037-0.0113 MPa. And the possible maximum value (0.0113 MPa) is larger than the threshold of stress triggering. Therefore, the occurrence of Lushanearthquake is probably effectively promoted by the Wenchuan earthquake. The aftershock distribution is well explained by theco-seismic stress changes of Lushan earthquake. By the two ends of the rupture of Lushan earthquake with increased Coulombfailure stress, a lack of aftershock recordings indicates the high seismic hazard. The stress accumulation and correspondingseismic hazard on the Kangding-Dafu segment of the Xinshuihe fault, the Beichuan-Yingxiu fault, the Pengxian-Guanxianfault, and the Ya an fault are further increased by the Lushan earthquake and post-seismic process of Wenchuan earthquake.