A Preliminary Study on a Seismotectonic Model for the Active Faults in the Xining Urban Area

作     者：Tian Qinjian Li Zhimin Zhang Junlong Ren Zhikun 

作者机构：China Earthquake Disaster Prevention Center Beijing 100029 China Institute of Earthquake Science CEA Beijing 100036 China Earthqnake Administration of Qinghai Province Xining 810001 China 

出 版 物：《Earthquake Research in China》 (中国地震研究（英文版）)

年 卷 期：2008年第22卷第1期

页      面：15-23页

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：This project was sponsored by National Development and Reform Commission (NDRC) on studies of experimental exploration of active fault in urban area(20041138) 

主　　题：Urban active fault Weak active fault Seismotectonic model Earthquake risk Xining 

摘      要：On the basis of the Xining active urban fault survey, we studied the relationship between the active urban fault and fold deformation. The result of this research shows that the Huangshuihe fault and the NW-striking fault on the northern bank of the Huangshulbe River are tensional faults on top of an anticline, the Nanchuanhe fault is a transverse tear fault resulting from differential folding on two sides of the fault, the east bank of the Beichuanhe River fault is a compressional fault developed on the core or climb of a syncline. By balance profile analysis of fold deformation and inversion of gravity anomaly data, we obtained the depth of the detachment plane and established the seismotectonic model of the ）fining urban area. Based on the seismotectonic model, we analyzed the earthquake potential of the active urban fault.