Complicated phenomena of the Beichuan-Yingxiu surface fracture zone during Wenchuan Ms8.0 earthquake in Sichuan Province,China  

作　　者：DENG ZhiHui YANG ZhuEn SUN ZhaoMin CHEN GuiHua MA WenTao SUN Qian 

机构地区：[1]Institute of Geology, China Earthquake Administration, Beijing 100029, China [2]Shangdong Earthquake Administration, Jinan 250014, China

出　　处：《Chinese Science Bulletin》2008年第24期3891-3896,共6页

基　　金：Supported by National Natural Science Foundation of China (Grant Nos.40841016,40372131 and 40702056);Dedicated Program as a Basic Scientific Research of Central Public Welfare Institute (Grant No.2060302);the National Science & Technology Pillar Program (Grant No.2006BAC01B03-02-03)

摘　　要：After Wenchuan Ms8.0 earthquake,the surface fractures have been investigated in Beichuan City and Yingxiu Town.It was found that the Beichuan-Yingxiu earthquake fracture zone trends northeastward,dipping to northwest.The earthquake fracture zone is mainly characterized by thrust faulting with small amounts of strike-slip movement,and demonstrating various complexities for different areas.The phenomena related to dextral strike-slip displacement are found in Beichuan City and those related to left-lateral strike-slip movement in Yingxiu Town.The compressive shortening of the two surface fracture zones in Beichuan City is 2.8―3.9 m and the left-lateral strike-slip displacement of the surface fractures in Yingxiu Town is 0.52 m.After Wenchuan Ms8.0 earthquake, the surface fractures have been investigated in Beichuan City and Yingxiu Town. It was found that the Beichuan-Yingxiu earthquake fracture zone trends northeastward, dipping to northwest. The earthquake fracture zone is mainly characterized by thrust faulting with small amounts of strike-slip movement, and demonstrating various complexities for different areas. The phenomena related to dextral strike-slip displacement are found in Beichuan City and those related to left-lateral strike-slip movement in Yingxiu Town. The compressive shortening of the two surface fracture zones in Beichuan City is 2.8-3.9 m and the left-lateral strike-slip displacement of the surface fractures in Yingxiu Town is 0.52 m.

关 键 词：汶川地震 地震断裂带 复杂性 北川县 

分 类 号：P315.9[天文地球—地震学]