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相邻火山弧之间的岩墙侵入是造成 2017 年阿贡火山喷发前地震群的原因。

Dyke intrusion between neighbouring arc volcanoes responsible for 2017 pre-eruptive seismic swarm at Agung.

机构信息

Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics (COMET), School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol, BS8 1RJ, UK.

Center for Volcanology and Geological Hazard Mitigation (CVGHM), Jl. Diponegoro no. 57, Bandung, 40122, Indonesia.

出版信息

Nat Commun. 2019 Feb 14;10(1):748. doi: 10.1038/s41467-019-08564-9.

DOI:10.1038/s41467-019-08564-9
PMID:30765693
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6376036/
Abstract

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, sub-vertical 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.

摘要

预测爆炸式喷发依赖于使用监测数据来解释岩浆运移和混合的模式和时间尺度。2017 年 9 月，一次远程地震群触发了巴厘岛阿贡火山周围约 14 万人的疏散。从卫星图像和 3D 数值模型，我们表明地震活动与阿贡和其邻居巴图尔之间的一个深的、近垂直的岩浆侵入有关。这与造成超过 1000 人死亡的 1963 年喷发的观测结果相结合，表明一个垂直和横向相互连接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部镁铁质源到浅成安山质储层的输送一致，这是由地形负荷引起的应力控制的，但与区域构造无关。阿贡和巴图尔之间的持续相互作用对解释远程地震活动、密切间隔的火山弧之间的联系以及级联灾害的可能性都有重要意义。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/0e2a1ab7401a/41467_2019_8564_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/b3f869dcb3a9/41467_2019_8564_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/089c18aee2cf/41467_2019_8564_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/6cc4ac7b0527/41467_2019_8564_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/a821fe5d0643/41467_2019_8564_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/0e2a1ab7401a/41467_2019_8564_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/b3f869dcb3a9/41467_2019_8564_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/faaa69b624bd/41467_2019_8564_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/240ca4238a1e/41467_2019_8564_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/0f76b07498dd/41467_2019_8564_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/e3990cca82bf/41467_2019_8564_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/089c18aee2cf/41467_2019_8564_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/6cc4ac7b0527/41467_2019_8564_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/a821fe5d0643/41467_2019_8564_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0886/6376036/0e2a1ab7401a/41467_2019_8564_Fig9_HTML.jpg

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本文引用的文献

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2
Vertically extensive and unstable magmatic systems: A unified view of igneous processes.垂向延伸且不稳定的岩浆系统：火成作用过程的统一认识。
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