台湾集集地震对福州小震群的动态库仑破裂应力分析  

Dynamic Coulomb Failure Stress Analysis of Fuzhou Small Earthquake Swarm Caused by Chi-Chi Earthquake in Taiwan Province

作　　者：董非非 袁丽文[2] 邓辉 DONG Feifei;YUAN Liwen;DENG Hui(Jiangxi Earthquake Agency,Nanchang 330096,China;Fujian Earthquake Agency,Fuzhou 350003,China)

机构地区：[1]江西省地震局,南昌330096 [2]福建省地震局,福州350003

出　　处：《华南地震》2022年第4期54-59,共6页South China Journal of Seismology

基　　金：江西省防震减灾与工程地质灾害探测工程研究中心开放基金(SDGD202016)与(SDGD202011)联合资助。

摘　　要：根据库仑破裂准则,采用离散波数法计算了1999年台湾集集7.6级地震对福州M_(L)3.8级地震的动态库仑应力变化影响,结果显示:震后105.1 s、114.51 s、116.08 s以及127.84 s时应力变化值超过了触发阈值,116.08 s时达到最大值约为0.74 MPa,说明台湾集集7.6级地震能够动态应力触发福州M_(L)3.8地震。此外根据台湾集集7.6级地震发生后不同时刻的动态库仑破裂应力场传播图可看出,其最大余震的发生可能受到了台湾集集7.6级地震的动态和静态触发共同作用。In this paper,according to Coulomb fracture criterion,the discrete wave number method is used to calculate the dynamic Coulomb stress variation of the 1999 Chi-Chi M_(S)7.6 earthquake in Taiwan on Fuzhou M_(L)3.8 earthquake.The results show that the stress change value exceeds the trigger threshold at 105.1,114.51,116.08 and 127.84 seconds after the earthquake,and the maximum value is about 0.74 MPa at 116.08 seconds,which shows that the Chi-Chi M_(S)7.6 earthquake in Taiwan can trigger the Fuzhou M_(L) 3.8 earthquake by dynamic stress.In addition,according to the dynamic Coulomb fracture stress field propagation diagram at different times after the 7.6 earthquake,it can be seen that the occurrence of the largest aftershock may be jointly triggered by the dynamic and static triggering of the Chi-Chi earthquake.

关 键 词：台湾集集7.6级地震 福州M_(L)3.8级地震 东南沿海东部地区 动态库仑破裂应力 

分 类 号：P315[天文地球—地震学]