摘要
选用福建数字地震台网宽频带记录,利用CAP方法反演仙游2013年9月4日M_L5.0、10月30日M_L4.5级地震震源机制解.反演结果显示,两次地震的节面参数基本一致.M_L5.0地震的最佳双力偶解为节面Ⅰ:走向135°、倾角85°、滑动角-159°;节面Ⅱ:走向43°、倾角70°、滑动角-4°;最佳深度分布于9 km附近.M_L4.5地震的最佳双力偶解为节面Ⅰ:走向141°、倾角71°、滑动角-166°;节面Ⅱ:走向47°、倾角78°、滑动角-19°;最佳深度分布于8 km附近.分析认为此两次地震的发震断层为带有正冲成分的走滑性质断层,结合余震分布情况看,东南向节面为断层面.
Using the broadband records of Fujian Regional Seismic Network,we inversion focal mechanisms of the Xianyou M_L5. 0Earthquake of Sep. 4 and M_L4. 5 Earthquake of Oct. 30 in 2013 by CAP method. Our results show that the parameters of the nodal planes are similar on this two Earthquakes. About M_L5. 0Earthquake,the best pair of couple solution is 135°,85° and- 159° for strike,dip and rake angles respectively; the strike,dip and rake angles of the other nodal plane are 43°,70° and- 4°respectively; the optimum focal depth is on 9 km nearby. About M_L4. 5 Earthquake,the best pair of couple solution is 141°,71° and- 166° for strike,dip and rake angles respectively; the strike,dip and rake angles of the other nodal plane are 47°,78° and- 19°respectively; the optimum focal depth is on 8 km nearby. The results show that this two earthquakes mechanism was a strike-slip faulting with a small normal thrust component. East-south nodal plane is the seismogenic fault from the distribution of aftershocks.
出处
《地球物理学进展》
CSCD
北大核心
2016年第4期1432-1437,共6页
Progress in Geophysics
