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  1. 防災科研関係論文

Locating hydrothermal fluid injection of the 2018 phreatic eruption at Kusatsu-Shirane volcano with volcanic tremor amplitude

https://nied-repo.bosai.go.jp/records/3116
https://nied-repo.bosai.go.jp/records/3116
6506f6c8-5777-4af6-920e-bcc7c2e2e391
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Locating hydrothermal fluid injection of the 2018 phreatic eruption at Kusatsu-Shirane volcano with volcanic tremor amplitude
言語
言語 eng
著者 Taishi Yamada

× Taishi Yamada

en Taishi Yamada

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Aika Kurokawa

× Aika Kurokawa

en Aika Kurokawa

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Akihiko Terada

× Akihiko Terada

en Akihiko Terada

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Wataru Kanda

× Wataru Kanda

en Wataru Kanda

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Hideki Ueda

× Hideki Ueda

en Hideki Ueda

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Hiroshi Aoyama

× Hiroshi Aoyama

en Hiroshi Aoyama

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Takahiro Ohkura

× Takahiro Ohkura

en Takahiro Ohkura

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Yasuo Ogawa

× Yasuo Ogawa

en Yasuo Ogawa

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Toshikazu Tanada

× Toshikazu Tanada

en Toshikazu Tanada

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抄録
内容記述タイプ Other
内容記述 <title>Abstract</title>Kusatsu-Shirane volcano hosts numerous thermal springs, fumaroles, and the crater lake of Yugama. Hence, it has been a particular study field for hydrothermal systems and phreatic eruptions. On 23 January 2018, a phreatic eruption occurred at the Motoshirane cone of Kusatsu-Shirane, where no considerable volcanic activity had been reported in observational and historical records. To understand the eruption process of this unique event, we analyzed seismic, tilt, and infrasound records. The onset of surface activity accompanied by infrasound signal was preceded by volcanic tremor and inflation of the volcano for?~?2?min. Tremor signals with a frequency band of 5?20?Hz remarkably coincide with the rapid inflation. We apply an amplitude source location method to seismic signals in the 5?20?Hz band to estimate tremor source locations. Our analysis locates tremor sources at 1?km north of Motoshirane and at a depth of 0.5?1?km from the surface. Inferred source locations correspond to a conductive layer of impermeable cap-rock estimated by magnetotelluric investigations. An upper portion of the seismogenic region suggests hydrothermal activity hosted beneath the cap-rock. Examined seismic signals in the 5?20?Hz band are typically excited by volcano-tectonic events with faulting mechanism. Based on the above characteristics and background, we interpret that excitation of examined volcanic tremor reflects small shear fractures induced by sudden hydrothermal fluid injection to the cap-rock layer. The horizontal distance of 1?km between inferred tremor sources and Motoshirane implies lateral migration of the hydrothermal fluid, although direct evidence is not available. Kusatsu-Shirane has exhibited unrest at the Yugama lake since 2014. However, the inferred tremor source locations do not overlap active seismicity beneath Yugama. Therefore, our result suggests that the 2018 eruption was triggered by hydrothermal fluid injection through a different pathway from that has driven unrest activities at Yugama.
言語 en
書誌情報 en : Earth, Planets and Space

巻 73, 号 1, p. 14, 発行日 2021-01-11
出版者
言語 en
出版者 Springer Science and Business Media LLC
ISSN
収録物識別子タイプ EISSN
収録物識別子 1880-5981
DOI
関連識別子 10.1186/s40623-020-01349-1
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