用P波初动法测定2014年11月22日康定6.3级地震的震源机制  

Determination of Kangding M_W6.3 Earthquake's Focal Mechanism Using the Onset of P-wave

作　　者：袁乃荣[1] 孔韩东 郭祥云[2] Yuan Nairong;Kong Handong;Guo Xiangyun(Hebei Normal University, Shijiazhuang 050024, China;Institute of Geophysics, China Earthquake Administration, Beijing 100081, China)

机构地区：[1]河北师范大学,石家庄市南二环东路20号050024 [2]中国地震局地球物理研究所,北京100081

出　　处：《中国地震》2018年第1期83-92,共10页Earthquake Research in China

基　　金：地球物理研究所基本业务费专项(DQJB18B04)资助

摘　　要：利用140个台站的P波初动资料,其中包括Pg波11个台站、Pn波75个台站、远震P波54个台站,采用格点尝试法获得了康定地震的震源机制解。结果表明,此次地震的震源机制是走滑型,与鲜水河断裂带的破裂特征一致。将本文使用的P波初动资料分别投影到其它机构给出的震源球模型,并计算相应的矛盾比,可以看出本文的结果最符合观测资料。康定地震余震分布、烈度分布情况以及构造应力场的结果,与本文所得康定地震震源机制相符。By employing the P-wave first motion data of 140 stations including Pg phase of 11 stations,Pn of 75 stations and far field P-wave data of 54 stations,we get the focal mechanism of Kangding earthquake with grid search method. The result shows that the earthquake belongs to strike slip type which is identical with the fracture characteristics of Xianshuihe Fault zone.Projecting the onsets we use to the focal sphere of other institutions and calculating the corresponding ration of inconsistent signs,it is observed that our result is most suitable with the observation. And the analysis of aftershock distribution,intensity distribution and tectonic stress field are consistent with the focal mechanism we get.

关 键 词：P波初动 格点尝试法 震源机制 康定地震 

分 类 号：P315[天文地球—地震学]