采用CAP方法反演2016年广西苍梧M_S 5.4地震震源机制解

Inversion of focal mechanism solution of Cangwu M_S 5.4 earthquake in Guangxi using CAP method

北京时间2016年7月31日广西梧州市苍梧县发生M_S 5.4地震,基于海南地震台网数字波形资料,采用CAP方法反演震源机制解。结果显示,此次M_S 5.4地震震源深度较浅,最佳深度为5.1 km,其中节面Ⅰ参数为:走向340°,倾角37°,滑动角-18°;节面Ⅱ参数为:走向85°,倾角79°,滑动角-125°。初步推断苍梧M_S 5.4地震破裂面运动以走滑为主,兼有正断性质,反演参数与中国地震台网中心结果较为一致。

Cangwu MS5.4earthquake occurred on July31,2016.Base on the records of Hainan Earthquake Network,we obtained the focal mechanism of the earthquake with the“cut and paste”(CAP)method.The result shows:the strike,dip and rake angles of nodal planeⅠare340°,37°and-18°;The other nodal plane is85°,79°and-125°.It is concluded that Cangwu MS5.4earthquake occurred in a strike-slip fault with normal type.The depth of the earthquake source is shallow,and the best focal depth is5.1km.The result is compared with the results of the China Earthquake Networks Center,and the results are consistent.