Interpretation of the west segment of the coastal fault zone in the coastal region of South China based on the gravity data

作     者：Lisi Bi Zhenhuan Ren Xiuwei Ye Tianyou Liu Jihua Qiao 

作者机构：Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Administration Guangdong Provincial Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Projects China University of Geosciences Development Research Center of China Geological Survey 

出 版 物：《Geodesy and Geodynamics》 (大地测量与地球动力学（英文版）)

年 卷 期：2018年第9卷第2期

页      面：142-150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：financially supported by Guangdong Provincial Science and Technology Plan Projects(20178030314082) General Project of National Natural Science Foundation of China (41676057) National Science and Technology Support Program (2015BAK18B01) 

主　　题：Coastal region of South China West segment of the coastal fault zone Gravity data Seismogenic structure 

摘      要：By systemic processing, comprehensive analysis, and interpretation of gravity data, we confirmed the existence of the west segment of the coastal fault zone(west of Yangjiang to Beibu Bay) in the coastal region of South China. This showed an apparent high gravity gradient in the NEE direction, and worse linearity and less compactness than that in the Pearl River month. This also revealed a relatively large curvature and a complicated gravity structure. In the finding images processed by the gravity data system, each fault was well reflected and primarily characterized by isolines or thick black stripes with a cutting depth greater than 30 km. Though mutually cut by NW-trending and NE-trending faults, the apparent NEE stripe-shaped structure of the west segment of the coastal fault zone remained unchanged,with good continuity and an activity strength higher than that of NW and NE-trending faults. Moreover,we determined that the west segment of the coastal fault zone is the major seismogenic structure responsible for strong earthquakes in the coastal region in the border area of Guangdong, Guangxi, and Hainan.