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- Title
Observing Posteruptive Deflation of Hydrothermal System Using InSAR Time Series Analysis: An Application of ALOS‐2/PALSAR‐2 Data on the 2015 Phreatic Eruption of Hakone Volcano, Japan.
- Authors
Doke, Ryosuke; Mannen, Kazutaka; Itadera, Kazuhiro
- Abstract
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. Plain Language Summary: From June 29 to July 1, 2015, an eruption occurred in Owakudani, the largest steaming area in Hakone volcano, Japan. Our analysis using satellite radar demonstrates that the central part of Hakone volcano has subsided since the eruption and that the deflation source is located in the reservoir of hot water beneath the volcano. One possible cause of this deflation is compaction due to a pressure drop produced by rupture and fluid migration during and after the eruption. Key Points: Posteruptive deflation beneath the central cones of Hakone volcano was detected by radar interferometry after the 2015 phreatic eruptionOur model inversion suggests that deflation of a hydrothermal system confined by a sealing layer beneath the volcano has been taking placeThe hydrothermal system deflation is likely attributable to rupture of the sealing layer and system depressurization due to the eruption
- Subjects
JAPAN; PRICE deflation; SYNTHETIC aperture radar; PRESSURE drop (Fluid dynamics); RADAR interferometry; SYNTHETIC apertures; VOLCANIC eruptions; VOLCANOES
- Publication
Geophysical Research Letters, 2021, Vol 48, Issue 19, p1
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2021GL094880