Research on the Seismotectonic Setting in Beibu Gulf Waters  

作　　者：Li Jinchen Pan Hua Chen Wenbin 

机构地区：[1]Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

出　　处：《Earthquake Research in China》2010年第2期263-271,共9页中国地震研究（英文版）

基　　金：funded under the special project of earthquake study(200708003) ;under the National Key Technology R&D Program (2006BAC13B01),China

摘　　要：In this paper we discuss the seismogenic structures of the two earthquakes occurring in the Beibu Gulf waters,based on the investigation of geological structure,faults,geophysical fields,seismicity and earthquake focal mechanism.The results show that the NEE trending faults along the boundary of the Wushi depression are the dominating seismogenic structures,and the NW trending faults are the key factors of stress concentration.The results also show that high seismicity has a significant relationship with the late Cenozoic deposition center in the Beibu Gulf,and their NE-NEE trending boundary faults are important to the identification of seismogenic structures.The special arcuate fault segment or the intersection point of the NW trending faults and NE-NEE trending boundary faults is a possible location of future earthquakes.In this paper we discuss the seismogenic structures of the two earthquakes occurring in the Beibu Gulf waters, based on the investigation of geological structure, faults, geophysical fields, seismicity and earthquake focal mechanism. The results show that the NEE trending faults along the boundary of the Wushi depression are the dominating seismogenic structures, and the NW trending faults are the key factors of stress concentration. The results also show that high seismicity has a significant relationship with the late Cenozoic deposition center in the Beibu Gulf, and their NE-NEE trending boundary faults are important to the identification of seismogenic structures. The special arcuate fault segment or the intersection point of the NW trending faults and NE-NEE trending boundary faults is a possible location of future earthquakes.

关 键 词：Beibu Gulf Double-shock type earthquake Seismogenic structure Wushi depression Haizhong depression 

分 类 号：P315.2[天文地球—地震学] P731.23[天文地球—固体地球物理学]