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

被引:12
作者
Narita, Shohei [1 ]
Murakami, Makoto [2 ]
机构
[1] Hokkaido Univ, Grad Sch Sci, Dept Nat Hist Sci, Kita Ku, N10W8, Sapporo, Hokkaido 0600810, Japan
[2] Hokkaido Univ, Inst Seismol & Volcanol, Fac Sci, Kita Ku, N10W8, Sapporo, Hokkaido 0600810, Japan
来源
EARTH PLANETS AND SPACE | 2018年 / 70卷
关键词
Phreatic eruption; Post-eruptive subsidence; Ground deformation; Mass balance; SAR; Volcanic-hydrothermal system; Ontake Volcano; PHREATIC ERUPTION; GROUND DEFORMATION; MOUNT ONTAKE; JAPAN; SYSTEM; EARTHQUAKE; AREA;
D O I
10.1186/s40623-018-0966-6
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
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 500m below the vents reflecting post-eruptive depressurization in a shallow hydrothermal reservoir. The cumulative deflation volume reached 7x10(5) m(3) 3years 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 3years after the eruption.
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页数:12
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