文章基本信息

标题：Shallow hydrothermal reservoir inferred from post-eruptive deflation at Ontake Volcano as revealed by PALSAR-2 InSAR
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作者：Shohei Narita ; Makoto Murakami
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2018
卷号：70
期号：1
页码：1-12
DOI：10.1186/s40623-018-0966-6
出版社：Springer Verlag
摘要：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.
关键词：Phreatic eruption; Post-eruptive subsidence; Ground deformation; Mass balance; SAR; Volcanic–hydrothermal system; Ontake Volcano