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Motoshirane on Kusatsu?Shirane volcano, Japan, based on data obtained from a network of eight tiltmeters and weather radar echoes. The tilt records can be explained by a subvertical crack model. Small craters that were formed by previous eruptions are aligned WNW?ESE, which is consistent with the strike of the crack modeled in this study. The direction of maximum compressive stress in this region is horizontal and oriented WNW?ESE, allowing fluid to intrude from depth through a crack with this orientation. Based on the crack model, hypocenter distribution, and MT resistivity structure, we infer that fluid from a hydrothermal reservoir at a depth of 2?km below Kusatsu?Shirane volcano has repeatedly ascended through a pre-existing subvertical crack. 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  1. 防災科研関係論文

The 2018 phreatic eruption at Mt. Motoshirane of Kusatsu?Shirane volcano, Japan: eruption and intrusion of hydrothermal fluid observed by a borehole tiltmeter network

https://nied-repo.bosai.go.jp/records/3117
https://nied-repo.bosai.go.jp/records/3117
952c1de8-cc2c-404e-bc23-0629a49136fc
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル The 2018 phreatic eruption at Mt. Motoshirane of Kusatsu?Shirane volcano, Japan: eruption and intrusion of hydrothermal fluid observed by a borehole tiltmeter network
言語
言語 eng
著者 Akihiko Terada

× Akihiko Terada

en Akihiko Terada

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Wataru Kanda

× Wataru Kanda

en Wataru Kanda

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Yasuo Ogawa

× Yasuo Ogawa

en Yasuo Ogawa

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Taishi Yamada

× Taishi Yamada

en Taishi Yamada

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Mare Yamamoto

× Mare Yamamoto

en Mare Yamamoto

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Takahiro Ohkura

× Takahiro Ohkura

en Takahiro Ohkura

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Hiroshi Aoyama

× Hiroshi Aoyama

en Hiroshi Aoyama

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Tomoki Tsutsui

× Tomoki Tsutsui

en Tomoki Tsutsui

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Shin’ya Onizawa

× Shin’ya Onizawa

en Shin’ya Onizawa

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抄録
内容記述タイプ Other
内容記述 <title>Abstract</title>We estimate the mass and energy budgets for the 2018 phreatic eruption of Mt. Motoshirane on Kusatsu?Shirane volcano, Japan, based on data obtained from a network of eight tiltmeters and weather radar echoes. The tilt records can be explained by a subvertical crack model. Small craters that were formed by previous eruptions are aligned WNW?ESE, which is consistent with the strike of the crack modeled in this study. The direction of maximum compressive stress in this region is horizontal and oriented WNW?ESE, allowing fluid to intrude from depth through a crack with this orientation. Based on the crack model, hypocenter distribution, and MT resistivity structure, we infer that fluid from a hydrothermal reservoir at a depth of 2?km below Kusatsu?Shirane volcano has repeatedly ascended through a pre-existing subvertical crack. The inflation and deflation volumes during the 2018 eruption are estimated to have been 5.1 × 10<sup>5</sup> and 3.6 × 10<sup>5</sup> m<sup>3</sup>, respectively, meaning that 1.5 × 10<sup>5</sup> m<sup>3</sup> of expanded volume formed underground. The total heat associated with the expanded volume is estimated to have been???10<sup>14</sup>?J, similar to or exceeding the annual heat released from Yugama Crater Lake of Mt. Shirane and that from the largest eruption during the past 130?year. Although the ejecta mass of the 2018 phreatic eruption was small, the eruption at Mt. Motoshirane was not negligible in terms of the energy budget of Kusatsu?Shirane volcano. A water mass of 0.1?2.0 × 10<sup>7</sup>?kg was discharged as a volcanic cloud, based on weather radar echoes, which is smaller than the mass associated with the deflation. We suggest that underground water acted as a buffer against the sudden intrusion of hydrothermal fluids, absorbing some of the fluid that ascended through the crack.
言語 en
書誌情報 en : Earth, Planets and Space

巻 73, 号 1, p. 157, 発行日 2021-06-30
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/s40623-021-01475-4
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