九寨沟M7.0地震多个震源机制中心解的确定  

Determination of Central Solution of Multiple Focal Mechanisms in the Jiuzhaigou M7.0 Earthquake

作　　者：马付红[1] 李莹甄[2] MA Fuhong;LI Yingzhen(Xichang Seismic Central Station, Sichuan Earthquake Agency, Sichuan Xichang 615000,China;Institute of disaster Prevention, Hebei Yanjiao 065201, China)

机构地区：[1]四川省地震局西昌地震中心站,四川西昌615000 [2]防灾科技学院,河北燕郊065201

出　　处：《四川地震》2020年第1期6-9,47,共5页Earthquake Research in Sichuan

摘　　要：2017年8月8日21时19分在四川省阿坝藏族羌族自治州九寨沟县发生M7.0地震,对该区域造成一定的人员伤亡和财产损失。该地震发生后,多家地学研究机构和研究人员用不同的资料和方法产出了该地震震源机制解。本研究通过收集他们使用的不同资料和方法得出同一地震的多个震源机制解,找出两个震源机制解空间旋转角差别的表达方法,用Levenberg─Marquadt算法使非线性问题转化成线性问题进行迭代求解,求出了该地震的中心震源机制解。21:19 on August 8th,2017,the M7.0 earthquake occurred in Jiuzhaigou County,Aba State,causing some casualties and losses.After the earthquake,a number of geoscience institutions and predecessors used different data and methods to produce the solution of the seismic source mechanism.This study collects them by using different materials and methods to obtain the data of the multiple source mechanism of the same earthquake and finding out the expression of the difference of the spatial rotation angle of the two source mechanisms.The Levenberg-Marquardt algorithm is used to transform the non-linear problem into a linear problem for iterative solution.the central solution of mechanism is obtained.It plays an important role in the follow-up stress analysis,stress field research and earthquake stress precursor analysis in the area.

关 键 词：九寨沟地震 震源机制解 中心解 

分 类 号：P315.33[天文地球—地震学]