Dyke intrusion between neighbouring arc volcanoes responsible for 2017 pre-eruptive seismic swarm at Agung
Dyke intrusion between neighbouring arc volcanoes responsible for 2017 pre-eruptive seismic swarm at Agung
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DOI：
10.1038/s41467-019-08564-9
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发表时间：
2019-02-14
影响因子：
16.6
通讯作者：
Syahbana, Devy Kamil
中科院分区：
文献类型：
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作者：
Albino, Fabien;Biggs, Juliet;Syahbana, Devy Kamil
预测爆炸性喷发依赖于使用监测数据来解释岩浆输送和混合的模式和时间尺度。 2017 年 9 月，远端地震群引发巴厘岛阿贡火山约 14 万人疏散。根据卫星图像和 3D 数值模型，我们表明地震活动与阿贡及其邻居巴杜尔之间深层、垂直的岩浆侵入有关。再结合 1963 年那次导致数千人死亡的火山喷发的观测结果，表明存在一个垂直和横向相互关联的系统，正在经历反复的岩浆混合。 2017年岩脉的几何形状与从深层镁铁质源到浅安山岩储层的输送一致，该输送受地形载荷引起的应力控制，但与区域构造无关。阿贡火山和巴杜尔火山之间持续的相互作用对于解释远端地震活动、间隔紧密的弧火山之间的联系以及连锁灾害的可能性具有重要意义。
Forecasting explosive eruptions relies on using monitoring data to interpret the patterns and timescales of magma transport and mixing. In September 2017, a distal seismic swarm triggered the evacuation of around 140,000 people from Agung volcano, Bali. From satellite imagery and 3D numerical models, we show that seismicity was associated with a deep, subvertical magma intrusion between Agung and its neighbour Batur. This, combined with observations of the 1963 eruption which caused more than thousand fatalities, suggests a vertically and laterally interconnected system experiencing recurring magma mixing. The geometry of the 2017 dyke is consistent with transport from a deep mafic source to a shallow andesitic reservoir controlled by stresses induced by the topographic load, but not the regional tectonics. The ongoing interactions between Agung and Batur have important implications for interpretation of distal seismicity, the links between closely spaced arc volcanoes, and the potential for cascading hazards.