1976年以来南美板缘浅源强震间应力触发研究  

Study on Stress Triggering of Strong Shallow-Focus Earthquakes in South America Since 1976

作　　者：杨建[1,2,3] 盛书中 万永革[1] 杨帆[1] 刘兆才[1] YANG Jian;SHENG Shuzhong;WAN Yongge;YANG Fan;LIU Zhaocai(Institute of Disaster Prevention, 465 Xueyuan Street, Yanjiao, Sanhe 101601, China;University of Chinese Academy of Sciences, A19 Yuquan Road, Beijing 100049, China;Institute of Geochemistry,CAS,99 West-Lincheng Road,Guiyang 550081,China)

机构地区：[1]防灾科技学院 [2]中国科学院大学,北京市玉泉路19号甲100049 [3]中国科学院地球化学研究所,贵阳市林城西路99号550081

出　　处：《大地测量与地球动力学》2018年第6期634-638,共5页Journal of Geodesy and Geodynamics

基　　金：河北省地震科技星火计划(DZ20170109001);国家自然科学基金(41704053)~~

摘　　要：从全球CMT目录中选取南美板缘1976-01-01~2016-12-24期间M≥7.0浅源地震的震源机制解资料(共36次),应用Coulomb3.3软件计算先前地震在后续地震断层面上产生的静态库仑应力变化,探讨先前地震对后续地震是否有静态应力触发作用。结果表明,受到先前地震触发作用的地震数目为11个(以0.1bar为触发阈值),触发地震占比为31.4%,受到抑制的地震数目为7个,不确定的地震数目为17个,静态库仑应力变化为正的地震数目为22个,占比为62.9%,表明1976年以来南美板缘强震间存在一定的应力触发作用。In this paper, we select the focal mechanism solution data of 36 shallow-focus earthquakes that satisfiesM≥7.0 from January 1, 1976 to December 24, 2016 on the south America plateau, drawing from the global CMT catalog. We use Coulomb3. 3 to calculate the static coulomb stress changes in the subsequent earthquake fault surface, and discuss whether there is a stress-triggered effect from previous earthquakes to subsequent earthquakes, The results show that, as the trigger threshold is 0.1 bar, 11 earthquakes are triggered by the previous earthquakes; the triggered earth- quakes are 31.4% of the total; there are 7 suppressed earthquakes and 17 uncertain earthquakes; 22 of the earthquakes have a positive static coulomb failure stress change, which accounts for 62.9% o- verall. Based on the research results above, we draw the conclusion that there have been some stress triggering effects between the south America plateau strong earthquakes since 1976.

关 键 词：应力触发 震源机制解 库仑破裂应力变化 南美板块 

分 类 号：P315[天文地球—地震学]