阳江新湖水库ML3.0级以上地震应力触发效应的统计检验  

Statistical Test of Seismic Stress Triggering Effect of ML≥3.0 Earthquakes in Xinhu Reservoir in Yangjiang

作　　者：王力伟[1,2] 黄柳芳 吴国瑞[1] 

机构地区：[1]广东省地震局,广东广州510070 [2]中国地震局地球物理研究所中国地震局地震观测与地球物理成像重点实验室,北京100081

出　　处：《科技创新与应用》2018年第25期1-6,共6页Technology Innovation and Application

基　　金：国家自然科学基金项目(编号:41474114);地震科技星火计划项目(编号:XH18033Y)联合资助

摘　　要：为研究新湖水库有波形记录以来的10次ML3.0级以上地震之间是否有静态库仑应力触发现象。文章首先使用双差定位方法对这10次地震进行了精定位,然后使用CAP方法反演了2次ML4.0级左右地震的震源机制解和最佳震源深度,使用初动和振幅比方法反演了其他8个震级为ML3.0~ML3.7的小地震的震源机制解。最后,使用PSGRN/PSCMP软件包,计算并统计了不同计算参数组合下,10次地震之间的静态库仑应力触发结果。结果发现:新湖库区9次后发生的地震中,6次地震被已发生地震所触发,占66.7%,1次地震被已发生地震所抑制,占11.1%,2次地震与已发生地震无关系,占比22.2%。新湖库区10次ML3.0级地震之间,存在微弱的静态库仑应力触发关系。In order to study whether there are static Coulomb stress triggering phenomena among 10 earthquakes with ML≥3.0 since the waveform records of Xinhu Reservoir. In this paper, the 10 earthquakes were first precisely located using the double difference location method, and then the focal mechanism solution and the optimum focal depth of the two earthquakes with ML=4.0 or so were inversed by the CAP method. The focal mechanism solutions of eight other small earthquakes with magnitude ML3.0-3.7 are inversed using the method of initial motion and amplitude ratio. Finally, using PSGRN/PSCMP software package, the static Coulomb stress triggering results of 10 earthquakes under different combinations of calculated parameters are calculated and calculated. The results show that 6 of the 9 earthquakes occurring in Xinhu reservoir area were triggered by the occurrence of earthquakes, occupying 66.7%; 1 earthquake was suppressed by the occurrence of earthquakes, taking up 11.1%; 2 earthquakes had nothing to do with the occurrence of earthquakes, accounting for 22.2% of the total. There is a weak static Coulomb stress triggering relationship among the 10 earthquakes with ML=3.0 in Xinhu reservoir area.

关 键 词：新湖震群 震源机制 双差定位 库仑应力 统计检验 

分 类 号：P315[天文地球—地震学]