摘要
基于密集的流动近台和分布相对均匀的固定台网资料,利用接收函数和面波联合反演震源区下方的速度结构,采用绝对走时和CAP方法获得2019-05-18松原M_(S)5.1地震的震源机制解,并重新定位余震。结果表明,该地震的发震断层为第二松花江断裂,断层面产状为303°/73°/10°,破裂深度为5.8 km,质心深度约为8 km。结合近年来发生在该地区的5级以上地震资料发现,特殊的震源区结构在东侧太平洋板块持续向松辽盆地深俯冲的作用下导致了松原M_(S)5.1地震及其他强震的发生。
Based on data collected from local temporary and permanent seismic stations,we study the crustal velocity and focal mechanism for the 18 May,2019 Songyuan M_(S)5.1 earthquake in Jilin Province and the aftershocks that occurred within half a month.We use the joint inversion of receiver function and surface dispersion,the absolute travel time location and the CAP methods.The results show that the earthquake has a rupture depth of 5.8 km,a centroid depth of 8 km,and a fault plane of 303°/73°/10°.The Second Songhuajiang fault may control the occurrence of the earthquake.The Songyuan Ms5.1 earthquake occurred at a depth with high velocity compared to the upper and lower layers.Our results,together with previous studies of about>5.0 earthquakes that occurred in the Songyuan area,suggest that the special velocity structure in focal area and the westward subduction of the Pacific Plate to the Songliao Basin may cause the occurrence of the Songyuan M_(S)5.1 earthquake.
作者
陈闯
危自根
李伟
高金哲
姜辉
CHEN Chuang;WEI Zigen;LI Wei;GAO Jinzhe;JIANG Hui(Jilin Earthquake Agency,5788 Jingyue Street,Changchun 130117,China;State Key Laboratory of Geodesy and Earth’s Dynamics,Innovation Academy for Precision Measurement Science and Technology,CAS,340 Xudong Street,Wuhan 430077,China;School of Earth and Space Sciences,University of Science and Technology of China,96 Jinzhai Road,Hefei 230026,China;Institute of Geophysics,CEA,5 South-Minzudaxue Road,Beijing 100081,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2021年第6期584-588,共5页
Journal of Geodesy and Geodynamics
基金
国家重点研发计划(2016YFC0600402)
中国地震局地震科技星火计划(XH19009)。
关键词
松原M_(S)5.1地震
绝对走时定位
CAP反演
接收函数和波形联合反演
震源机制
Songyuan M_(S)5.1 earthquake
absolute travel time location
CAP inversion
joint inversion of receiver function and surface dispersion
focal mechanism
