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.
基金
funded under the special project of earthquake study(200708003)
under the National Key Technology R&D Program (2006BAC13B01),China
关键词
地震构造
北部湾
设置
水域
发震构造
边界断层
地震活动
结构鉴定
Beibu Gulf
Double-shock type earthquake
Seismogenic structure
Wushi depression
Haizhong depression
