Eruptive fracture location forecasts from high‐frequency events on Piton de la Fournaise Volcano
Eruptive fracture location forecasts from high‐frequency events on Piton de la Fournaise Volcano
复制标题
Piton de la Fournaise 火山高频事件喷发裂缝位置预测
DOI：
10.1002/grl.50890
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发表时间：
2013
影响因子：
5.2
通讯作者：
A. Peltier
中科院分区：
文献类型：
--
作者：
L. de Barros;C. Bean;M. Zecevic;F. Brenguier;A. Peltier
Fournaise火山（留尼汪岛）是一座非常活跃的玄武岩火山，在2009年11月至2010年12月期间爆发了五次。爆发前的地震危机通常持续几个小时，主要由火山构造群组成。在火山-构造群和爆发性震颤之间的静止期，我们识别出另一个具有非常高频率内容的事件群。这些事件都很浅，并且靠近未来的喷发地点。它们似乎与浅部岩浆侧向传播通道的打开有关。由于这些事件开始发生，而岩浆仍处于垂直传播阶段，这种地震活动似乎与火山的一般响应的应力扰动，而不是直接引起的岩浆压力。这一新的观测结果为火山喷发位置的短期预测带来了新的见解。
Piton de la Fournaise (La Réunion island) is a very active basaltic volcano, with five eruptions between Nov 2009 and Dec 2010. Pre‐eruptive seismic crises usually last for a few hours and mainly consist of a volcano‐tectonic swarm. During the quiescent period between the volcano‐tectonic swarm and the eruptive tremor, we identify another swarm of events with a very high frequency content. These events are shallow and are located close to the future eruption site. They seem associated with the opening of the path for the magma propagating laterally at shallow depth. As these events start to occur while the magma is still in a vertical propagation phase, this seismicity seems to be related with the generic response of the volcano to the stress perturbation and not directly induced by the magma pressure. This new observation brings new insights to short‐term forecasting of the eruption location.