2014年新疆于田M_S7.3地震矩心矩张量快速测定  

Rapid determination of the centroid moment tensor to the 2014 Yutian M_S7. 3 earthquake,Xinjiang

作　　者：赵旭[1] 黄志斌[1] 陈宏峰[1] 赵博[1] 杜广宝[1] 

机构地区：[1]中国地震台网中心

出　　处：《中国地震》2014年第2期151-158,共8页Earthquake Research in China

基　　金：地震科技星火计划项目(XH12060Y);地震行业科研专项(201208003);国家海洋局行业科研专项(201405026)共同资助

摘　　要：基于中国大陆中强震自动矩张量测定系统,采用虚拟中国地震台网记录的近震波形(震中距4°~12°),反演了新疆于田MS7.3地震的矩心矩张量。结果显示,地震发震断层面参数分别为走向243°/倾角70°/滑动角-18°,表现为1次左旋走滑为主兼有少量正倾滑分量的事件。矩心在水平方向上位于震中(36.123°N,82.499°E)以东约13 km,矩心深度约10 km。总标量地震矩M0为3.05×1019N·m,换算成矩震级MW6.92,推断震源破裂时大部分能量释放的持续时间约14s。同时探讨了自动矩张量测定系统在未来地震灾情预判中的重要作用。The authors successfully employ an automatic centroid moment tensor inversion system to infer the centoid moment tensors of the Yutian MS7.3 earthquakes,Xinjiang using regional seismic waveforms （4° ＜Δ ＜ 12°） observed by the virtual China Seismic Networks,which has been recently set up.The results indicate that this event occurred on a rupture plane （strike 243°,dip 70°,and rake-18°）,showing a le^lateral strike-slip mechanism with minor normalfaulting component.The centroid in the horizontal direction is located at nearly 13km east of the epicenter （36.123°N,82.499°E）,and the best-fitting centroid depth is round 10km.The total scalar moment,M0,is retrieved with an average value of 3.05 × 1019N·m （or moment magnitude MW6.92）.Most of the energy is released within about 14s.Moreover,we discuss about the future application of the automatic centroid moment tensor inversion system in earthquake disaster decision.

关 键 词：W震相 矩心矩张量自动反演 于田地震 

分 类 号：P315[天文地球—地震学]