Shallow hydrothermal reservoir inferred from post-eruptive deflation at Ontake Volcano as revealed by PALSAR-2 InSAR

Shallow hydrothermal reservoir inferred from post-eruptive deflation at Ontake Volcano as revealed by PALSAR-2 InSAR
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PALSAR-2 InSAR 揭示的 Ontake 火山喷发后紧缩推断浅层热液储层

DOI:
10.1186/s40623-018-0966-6
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发表时间:
2018
期刊:
Earth, Planets and Space
影响因子:
--
通讯作者:
M. Murakami
M. Murakami
中科院分区:
--
文献类型:
--
作者:
Shohei Narita;M. Murakami

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2014年,日本中部的Ontake火山发生潜水喷发,造成多人死亡和失踪。干涉合成孔径雷达数据显示,在喷发后,新形成的喷发口周围出现了局部规模的下沉。源建模导致一个近球形的通缩源安置在500米的深度以下的喷口反映后喷发降压在一个浅热液水库。喷发后3年累计放气量达7 × 105m3。我们的源模型和GNSS数据之间的比较表明,这个浅层水库可能在2007年形成,并保持稳定,直到2014年爆发。没有明显的同喷沉降,表明浅层水库不是驱动潜水喷发的主要水源。根据简单的假设,浅水库和喷口排放羽流之间的质量平衡表明,羽流中的大部分水来自比浅水库更深的深度。为了约束喷发后的过程,它是必要的跟踪不仅变形,但也羽流排放后3年的喷发。
In 2014, a phreatic eruption occurred at the Ontake Volcano in Central Japan causing multiple deaths and missing persons. Interferometric Synthetic Aperture Radar data showed local-scale subsidence around the newly created eruptive vents after the eruption. Source modeling resulted in a nearly spherical deflation source emplaced at a depth of 500 m below the vents reflecting post-eruptive depressurization in a shallow hydrothermal reservoir. The cumulative deflation volume reached 7 × 105 m3 3 years after the eruption. Comparison between our source model and GNSS data indicates that this shallow reservoir could have formed by 2007 and remained stable until the 2014 eruption. The absence of significant syn-eruptive subsidence indicates that the shallow reservoir was not the main water source driving the phreatic eruption. Under simple assumptions, mass balance between the shallow reservoir and the discharge plume from the vents indicates most of the water contained in the plume comes from greater depth than the shallow reservoir. To constrain the post-eruptive process, it is necessary to track not only deformation but also plume discharge for 3 years after the eruption.
DOI: 10.1785/bssa0820021018
发表时间: 1992-04
影响因子: 3
作者:
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发表时间: 2009
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作者:
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通讯作者: 宮田康治