Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 48, Issue 19, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL094880
Keywords
InSAR time series analysis; Hakone volcano; hydrothermal system; posteruptive deflation; phreatic eruption; ALOS-2; PALSAR-2
Categories
Funding
- JSPS KAKENHI grant [19K04005, 21H04602]
- Grants-in-Aid for Scientific Research [21H04602, 19K04005] Funding Source: KAKEN
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A study using satellite data analyzed the deformation of Owakudani after a phreatic eruption, finding that the central cones of the volcano have subsided, possibly due to compaction caused by a decrease in pore pressure from rupture and fluid migration.
From June 29 to July 1, 2015, a phreatic eruption occurred in Owakudani, the largest fumarole area in Hakone volcano, Japan. In this study, an interferometric synthetic aperture radar (InSAR) time series analysis of the Advanced Land Observing Satellite-2 (ALOS-2)/Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) data was performed to measure deformation after the eruption. The results show that the central cones of the volcano have subsided since the eruption and its deflation source is located beneath the previously estimated bell-shaped conductor, which is considered as a sealing layer confining a pressurized hydrothermal reservoir. Therefore, the InSAR results demonstrate the deflation of the hydrothermal system beneath the volcano. One possible cause of this deflation is compaction due to a decrease in pore pressure caused by rupture and fluid migration during and after the eruption.
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