Reactivating and Calming Volcanoes: The 2015MW8.3 Illapel Megathrust Strike
Reactivating and Calming Volcanoes: The 2015MW8.3 Illapel Megathrust Strike
复制标题
DOI：
10.1029/2020gl087738
复制
发表时间：
2020-08-28
影响因子：
5.2
通讯作者：
Basualto, Daniel
中科院分区：
文献类型：
--
作者：
Farias, Cristian;Basualto, Daniel
2015年的M（W）8.3 Illapel地震在数周至数月的时间范围内发生，来自Nevados de奇兰，Copahue和比利亚里卡火山的反应非常不同，这些火山都位于距离破裂带超过580公里的地方。在这里，我们展示了如何内华达州德奇兰和科帕韦开始新的喷发阶段，和比利亚里卡进入一个相对平静的时期。使用地震，大地测量和地球化学观测，结合数值波传播模拟，我们还表明，断层系统的几何形状控制地震对每个火山的影响。我们认为，火山对地震的敏感性取决于主震前的临界状态和断层系统的几何形状。在这种情况下，同一次地震在同一时间产生非常不同的反应，距离很远，使火山成为非常敏感的系统。
The 2015M(W)8.3 Illapel earthquake was followed in a time frame of weeks to months by very different responses from Nevados de Chillan, Copahue, and Villarrica volcanoes, all located more than 580 km from the rupture zone. Here we show how Nevados de Chillan and Copahue started new eruptive phases, and Villarrica entered in a period of relative calm. Using seismic, geodetic, and geochemical observations, in combination with numerical wave propagation simulations, we also show that the geometry of the fault system controlled the impact of the earthquake on each volcano. We argue that the sensitivity of a volcano toward an earthquake depends on both its critical state before the mainshock and the geometry of its fault system. This is a case where the same earthquake generates very different responses at the same time, at large distances, rendering volcanoes as very sensitive systems.