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首页> 外文期刊>Journal of Volcanology and Geothermal Research >3D electrical conductivity imaging of Halema'uma'u lava lake (Kilauea volcano)
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3D electrical conductivity imaging of Halema'uma'u lava lake (Kilauea volcano)

机译：Halema'uma'u熔岩湖（Kilauea火山）的3D电导率成像

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Before the 2018 collapse of the summit of Kilauea volcano, a ca. 200 m in diameter lava lake inside of Halema'uma'u crater was embedded in a very active hydrothermal system. In 2015, we carried out an electrical conductivity survey and the data were inverted in 3D. The lack of conductivity contrast precludes distinguishing the lava column from the surrounding hydrothermal zones. Laboratory measurements on samples from the lava lake show that the conductivity of magma is significantly lower than that of hydrothermal zones but the high vesicularity of the upper part of the lava lake may decrease its macroscopic conductivity. Based on the 3D conductivity model, we distinguish at least two types of hydrothermal circulations: 1) one guided by the collapse faults of Halema'uma'u crater and by the magmatic column of the lava lake, and 2) another guided by previous caldera faults and fractures related to intrusions. We observe that the location of the faults formed during the 2018 collapse of the summit was greatly influenced by the hydrothermally altered zones. (C) 2019 Elsevier B.V. All rights reserved.
机译：在2018年基拉韦厄火山山顶坍塌之前， Halema'uma'u火山口内直径200 m的熔岩湖被埋入一个非常活跃的热液系统中。 2015年，我们进行了电导率调查，并将数据转换为3D格式。由于缺乏电导率对比，因此无法将熔岩柱与周围的热液区分开。实验室对熔岩湖样品的测量表明，岩浆的电导率明显低于热液区，但熔岩湖上部的高泡状性可能会降低其宏观电导率。基于3D电导率模型，我们至少可以区分两种热液循环类型：1）一种由Halema'uma'u火山口的崩塌断层和熔岩湖的岩浆柱引导，以及2）另一种由先前的火山口引导与侵入有关的断层和断裂。我们观察到，2018年山顶坍塌期间形成的断层位置受到水热蚀变带的很大影响。 （C）2019 Elsevier B.V.保留所有权利。

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