The stress change of the major activity faults in the Weihe Graben after the Wenchuan earthquake  

作　　者：Sheng Dong Weina Yuan Fuqiang Shi 

机构地区：[1]School of Geological Engineering and Geomatics,Chang'an University,Xi'an,710064,China [2]Shaanxi Earthquake Agency,Xi'an,710068,China

出　　处：《Earthquake Research Advances》2021年第2期9-15,共7页地震研究进展（英文）

基　　金：sponsored by the Program of Science for Earthquake Resilience,China Earthquake Administration(XH21032);the Pro-gram from Xi'an Geological Survey Center of China Geological Survey([2018]01-38).

摘　　要：The seismicity of small earthquakes in the Weihe Graben has changed after the Wenchuan earthquake.In detail,the seismicity around the Qishan-Mazhao fault in the western Weihe Graben decreased,while the seismicity in Gaoling and Jingyang Counties in the middle portion of the Weihe Graben and that in the area between Hancheng and Yuncheng Cities in eastern Weihe Graben increased.In this paper,the stress loading on the major activity faults in the Weihe Graben induced by the Wenchuan earthquake is discussed based on the Coulomb stress theory.The results show that the Wenchuan earthquake has exerted an unloading effect in the western Weihe Graben and a loading effect in the middle and eastern Weihe Graben.The spatially varied Coulomb stress is consistent with the seismicity distribution,indicating that the seismicity change is closely associated with the stress loading caused by the Wenchuan earthquake.

关 键 词：Coulomb stress Seismic activity The Weihe Graben 

分 类 号：P315[天文地球—地震学]