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
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
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DOI：
10.1029/2021gl094880
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发表时间：
2021-06
影响因子：
5.2
通讯作者：
R. Doke;K. Mannen;K. Itadera
中科院分区：
文献类型：
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作者：
R. Doke;K. Mannen;K. Itadera
2015年6月29日至7月1日，日本箱根火山最大的喷气孔区大涌谷发生潜水喷发。在本研究中，对先进陆地观测卫星 2 (ALOS-2)/相控阵型 L 波段合成孔径雷达 (PALSAR-2) 数据进行干涉合成孔径雷达 (InSAR) 时间序列分析，以测量喷发后的变形。结果表明，自喷发以来，火山的中心锥体已经下沉，其紧缩源位于先前估计的钟形导体下方，该导体被认为是限制加压热液储层的密封层。因此，InSAR结果证明了火山下方热液系统的收缩。这种紧缩的一个可能原因是由于喷发期间和喷发后的破裂和流体迁移导致孔隙压力下降而导致的压实。
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.