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  1. 防災科研関係論文

Basement structure of Hokkaido Komagatake Volcano, Japan, as revealed by artificial seismic survey

https://nied-repo.bosai.go.jp/records/2802
https://nied-repo.bosai.go.jp/records/2802
4a3c5b2a-14b8-4af2-8dbd-dea936a76e19
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Basement structure of Hokkaido Komagatake Volcano, Japan, as revealed by artificial seismic survey
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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Tokumitsu Maekawa

× Tokumitsu Maekawa

en Tokumitsu Maekawa

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Atsuo Suzuki

× Atsuo Suzuki

en Atsuo Suzuki

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Hiroki Miyamachi

× Hiroki Miyamachi

en Hiroki Miyamachi

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Tomoki Tsutsui

× Tomoki Tsutsui

en Tomoki Tsutsui

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Takeshi Matsushima

× Takeshi Matsushima

en Takeshi Matsushima

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Satoru Tanaka

× Satoru Tanaka

en Satoru Tanaka

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Jun Oikawa

× Jun Oikawa

en Jun Oikawa

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Norimichi Matsuwo

× Norimichi Matsuwo

en Norimichi Matsuwo

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Keigo Yamamoto

× Keigo Yamamoto

en Keigo Yamamoto

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Toru Shiga

× Toru Shiga

en Toru Shiga

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Takehiko Mori

× Takehiko Mori

en Takehiko Mori

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抄録
内容記述タイプ Other
内容記述 We investigate the basement structure of the Hokkaido Komagatake volcano, Japan, by an artificial seismic survey. By inverting first arrival time data, a three-dimensional P-wave velocity model down to 3 km b.s.l. is obtained. The resultant velocity model reasonably reflects regional geological features and is consistent with Bouguer anomalies. Around the Komagatake volcano, the velocity basement deepens to NNW on the whole, reflecting the deepening of the geological basement toward that direction. Higher velocities are observed in Oshima and Kameda Mountains where Neogene volcanic and sedimentary rocks are present. On the contrary, lower velocities are observed in lowlands surrounding the volcano, where Komagatake deposits and Quaternary sediments crop out. At the volcano, a prominent high velocity zone was detected from the surface down to a depth of 1.5 km b.s.l. Above the base, probably a contrast between the core part with higher proportion of massive lavas and intrusions and flank areas dominated by loose pyroclastic deposits caused the prominent high velocity. Below the base, it is thought that solidified intrusive bodies largely contribute to making the high velocity. Further, a high velocity elongates from Kameda Mountains to beneath the summit. This is due to a shallower of the volcano substratum. (C) 2009 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH

巻 183, 号 3-4, p. 245-253, 発行日 2009-06
出版者
言語 en
出版者 ELSEVIER SCIENCE BV
ISSN
収録物識別子タイプ EISSN
収録物識別子 1872-6097
DOI
関連識別子 10.1016/j.jvolgeores.2009.03.013
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