3D P-wave Velocity Structure and Active Tectonics in the Xinfengjiang Area of Guangdong

作     者：Ye Xiuwei Huang Yuanmin Liu Jiping 

作者机构：Key Laboratory of Earthquake Monitoring and Disaster Mitigation TechnologyEarthquake Administration of Guangdong ProvinceGuangzhou 510070China 

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

年 卷 期：2017年第31卷第4期

页      面：441-454页

核心收录：

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：sponsored by the National Natural Science Foundation of China(41676057) the Scientific Program of Guangdong Province(2012A030200005) 

主　　题：P-wave velocity structure Active tectonics Simultaneous inversion method The Xinfengjiang reservoir 

摘      要：In this paper,we determined an earthquake sequence location in the Xingfengjiang area from June,2007 to July,2014 and the 3 D P-wave velocity structure by a simultaneous inversion method. On that basis,we studied the occurrence features of active tectonics and the earthquake source mechanism. The results show that the reservoir fracture system has a tendency to increase with gradual depth from southeast to northwest,consistent with gravitational field research results. There are 4 high velocity zones( HVZ) under the depth of the 7 km-12 km crust between the Xinfengjiang Reservoir dam and Xichang District,Dongyuan. The max velocity of the biggest HVZ which is under Xichang is 6. 3 km/s. Under the reservoir dam there is a strong tectonic deformation zone,as the center exit Renzishi fault( F_2),Nanshan-Aotou faults( F_4),Heyuan fault( F_1) and Shijiao-Xingang-Baitian fault( F_5),7 earthquakes with M_L≥ 5. 0( including M 6. 1 in March,1962) occurred at the high gradient zone of the HVZ Ⅲ and HVZ Ⅳ edge which has been under the reservoir dam since 1960, with relativity energy releasing more thoroughly. Moderate seismic activity occurred at the HVZ Ⅰ edge which has been under Xichang since 2012,and is a danger zone for M5. 0 earthquakes in the future.