Slip distribution inversion of seismic sub-fault dip iteration using gradient based optimizer algorithm

作     者：Leyang Wang Han Li Ming Pang Leyang Wang;Han Li;Ming Pang

作者机构：Key Laboratory of Mine Environmental Monitoring and Improving Around Poyang Lake of Ministry of Natural ResourcesEast China University of TechnologyNanchang 330013China School of Surveying and Geoinformation EngineeringEast China University of TechnologyNanchang 330013China College of Resources and EnvironmentShandong Agricultural UniversityTaian 271018China 

出 版 物：《Geodesy and Geodynamics》 (大地测量与地球动力学（英文版）)

年 卷 期：2024年第15卷第2期

页      面：114-121页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：funded by the National Natural Science Foundation of China(42174011) 

主　　题：Gradient basedoptimizer(GBO) Lushan earthquake Non-planefault model Slid distribution 

摘      要：This paper considers setting different dips for different sub-faults to fit the actual rupture situation based on the fault rupture of the 2013 Lushan M_(S)7.0 ***,combined with the coseismic GNSS data of the Lushan earthquake,the source parameters and sliding distribution of the Lushan earthquake fault are ***,we use the gradient based optimizer(GBO)in nonlinear inversion to obtain the source parameters of this seismic *** inversion results indicate that the strike of the fault is 206.52°,the dip is 44.10°,the length is 21.92 km,and the depth is 12.79 *** refine the sliding distribution of the seismic fault,the seismic fault is divided into 3×3 ***,we fix the central sub-fault dip of 44.10°;the dip of other sub-faults is obtained by *** that,the model is further divided into a fault layer model composed of 23×19 sub fault slices,and using the Matlab fitting function is used to fit the dip of the 23×19 sub ***,the Lushan seismic fault plane is established as a shovel structure with steep upper and gentle lower,steep south and gentle *** slip distribution inversion results indicate that the depth of the slip peak is 13 km,the corresponding maximum slip momentum is 0.67 m,the seismic moment is 1.10×10^(19)N·m and the corresponding moment magnitude is *** results above are consistent with the research results of seismology.