1976年以来南美板缘浅源强震间应力触发研究

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0.1 bar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。

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

In this paper, we select the focal mechanism solution data of 36 shallow-focus earthquakes that satisfies M≥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 earthquakes 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% overall. 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.