用双子地震相干函数法对常熟震群进行精确相对定位

Accurate Relative Relocation of Changshu Earthquake Swarm by Using the Seismic Doublet Coherence Function Method

采用双子地震相干函数分析法利用江苏区域遥测地震台网数字化资料对2001年11月3-14日发生在江苏省常熟-张家港间的震群进行精确相对定位。主参考地震用区域地壳结构重新定位。结果表明:(1)主参考地震与区域遥测地震台网的定位相比偏离了10.61 km;(2)震群中地震的平面位置更集中;(3)各次地震的震源深度体现了震群特征。本文还对震群与构造的关系进行了分析,推测可能与顾山-虞山断裂有关。

During Nov. 3-14, 2001, a earthquake swarm with M1. 5-3. 7 occurred between Changshu city and Zhangjiagang city, in Jiangsu province. Based on the digital data recorded by the telemetered seismic network of Jiangsu province, using the Seismic Doublet Coherence Function Method（DCFM）, this swarm is relatively relocated in this paper. The main event of the swarm is relocated by local crust model travel time table. The results demonstrate： （1） The main event is separated 10. 61 km from the original one; （2） The swarm＇s epicenters are more close each other than the original distribution. （3） The focus depths are 16.5-17.5 km, which can not be determined in original way. The relationship between relocated swarm and tectonics is discussed also.