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  1. 防災科研関係論文

P-wave velocity structure of Usu volcano: Implication of structural controls on magma movements and eruption locations

https://nied-repo.bosai.go.jp/records/4304
https://nied-repo.bosai.go.jp/records/4304
3285ccbd-14ad-4c65-9550-ec9f68629e96
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル P-wave velocity structure of Usu volcano: Implication of structural controls on magma movements and eruption locations
言語
言語 eng
著者 Shin'ya Onizawa

× Shin'ya Onizawa

en Shin'ya Onizawa

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Hiromitsu Oshima

× Hiromitsu Oshima

en Hiromitsu Oshima

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Hiroshi Aoyama

× Hiroshi Aoyama

en Hiroshi Aoyama

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Hitoshi Y. Mori

× Hitoshi Y. Mori

en Hitoshi Y. Mori

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Tokumitsu Maekawa

× Tokumitsu Maekawa

en Tokumitsu Maekawa

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Atsuo Suzuki

× Atsuo Suzuki

en Atsuo Suzuki

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Tomoki Tsutsui

× Tomoki Tsutsui

en Tomoki Tsutsui

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Norimichi Matsuwo

× Norimichi Matsuwo

en Norimichi Matsuwo

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Jun Oikawa

× Jun Oikawa

en Jun Oikawa

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Takao Ohminato

× Takao Ohminato

en Takao Ohminato

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Keigo Yamamoto

× Keigo Yamamoto

en Keigo Yamamoto

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Takehiko Mori

× Takehiko Mori

en Takehiko Mori

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Taka&apos

× Taka&apos

en Taka&apos

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aki Taira

× aki Taira

en aki Taira

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Hiroki Miyamachi

× Hiroki Miyamachi

en Hiroki Miyamachi

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Hiromu Okada

× Hiromu Okada

en Hiromu Okada

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抄録
内容記述タイプ Other
内容記述 The three-dimensional P-wave velocity structure of Usu volcano, Japan, is investigated by using first arrival time data of the 2001 active seismic survey. The velocity structure down to the Pre-Neogene basement below the volcano is revealed. The most prominent feature of the velocity model is the deepening of the basement toward the south-southwest. The resultant velocity model contributes to the relocations of 2000 eruption precursory earthquakes. The precursory seismic activity, which reflects pre-eruptive magma movements, is divided into three parts: (1) a sub-vertical distribution indicating magma ascent to beneath the summit of the volcano, (2) a northward migration that indicates magma movement resulting in the subsequent eruptions at the northwestern foot, and (3) a horizontal southward migration possibly indicating intrusion of sill. The northward and southward migrating earthquakes are constrained by the dipping basement structure such that most of the events occur within the middle Miocene or Pre-Neogene layer. The geographical distribution of craters and the upheavals of past eruptions are also constrained by the subsurface basement. At the northern foot of Usu Volcano, the distribution of these craters and upheavals is such that they are enclosed by the subsurface basement, which becomes shallower toward the north. On the other hand, no traces of eruptions are found in the southern and southwestern foots where the basement deepens toward the south-southwest. (c) 2006 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH

巻 160, 号 1-2, p. 175-194
出版者
言語 en
出版者 ELSEVIER SCIENCE BV
ISSN
収録物識別子タイプ ISSN
収録物識別子 0377-0273
DOI
関連識別子 10.1016/j.jvolgeores.2006.10.005
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