Simulating the strong ground motion of the 2022 MS6.8 Luding,Sichuan,China Earthquake

作     者：Libao Zhang Lei Fu Aiwen Liu Su Chen Libao Zhang;Lei Fu;Aiwen Liu;Su Chen

作者机构：Institute of GeophysicsChina Earthquake AdministrationBeijing 100081China College of Architecture and Civil EngineeringBeijing University of TechnologyBeijing 100024China 

出 版 物：《地震学报:英文版》 (Earthquake Science)

年 卷 期：2023年第36卷第4期

页      面：283-296页

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：supported by the Special Fund of the Institute of Geophysics,China Earthquake Administration(Nos.DQJB2B28 and DQJB22X09) the National Natural Science Foundation of China(No.52192675) 

主　　题：stochastic finite-fault simulation response spectrum quality factor site nonlinearity Luding MS6.8 earthquake 

摘      要：Stochastic finite-fault simulations are effective for simulating ground motions and are widely used in engineering to determine the impacts of ground motion and develop relevant predictive *** this study,the source,path,and site amplification coefficient of western Sichuan Province,China,and stochastic finite-fault simulations were used to simulate the acceleration time series,Fourier amplitude spectra,and 5%damped response spectra of 28 strong-motion stations with rupture distances within 300 km of the 2022 MS6.8 Luding *** simulation results of 14 stations at rupture distances of 45-185 km match the ***,the simulation results of 3 near-and 6 far-field stations at rupture distances of 12-36 km and 222-286 km,respectively,were obviously deviated from the *** results of the near-field stations are larger than the observations at high frequencies(6 Hz).The discrepancy likely comes from the nonlinear site effect of near-field stations,which reduced the site amplification at high *** result of the far-field stations is smaller than the observation at frequencies above 1 *** these stations are located close to the Longmenshan Fault Zone(LFZ),thus,we obtained a new quality factor(Q)from data of historical events and stations located around *** the new Q value,the discrepancies of the high-frequency simulation results of the far-field stations were *** result indicated that the laterally varying Q values can be used to address the impact of strong crustal lateral heterogeneity on simulation.