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  1. 防災科研関係論文

Ballistic ejecta and eruption condition of the vulcanian explosion of Shinmoedake volcano, Kyushu, Japan on 1 February, 2011

https://nied-repo.bosai.go.jp/records/5888
https://nied-repo.bosai.go.jp/records/5888
91b2b841-d962-4c85-9363-7fae59fe9141
Item type researchmap(1)
公開日 2023-05-24
タイトル
言語 en
タイトル Ballistic ejecta and eruption condition of the vulcanian explosion of Shinmoedake volcano, Kyushu, Japan on 1 February, 2011
言語
言語 eng
著者 Fukashi Maeno

× Fukashi Maeno

en Fukashi Maeno

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Setsuya Nakada

× Setsuya Nakada

en Setsuya Nakada

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Masashi Nagai

× Masashi Nagai

en Masashi Nagai

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Tomofumi Kozono

× Tomofumi Kozono

en Tomofumi Kozono

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抄録
内容記述タイプ Other
内容記述 The physical condition of the 1 February, 2011, vulcanian explosion at Shinmoedake volcano, Japan, is estimated based on the size of impact craters created by ballistic ejecta, using a ballistic trajectory model and a scaling law for impact crater formation. The initial velocity, impact velocity and mass of ejecta were estimated at 240-290 m/s, 140 +/- 20 m/s and 1-3 ton, respectively. The gas mass fraction at the source was calculated to be 0.04-0.1, using the initial velocity and a theoretical model of vulcanian explosion. This gas mass fraction is higher than the petrologically estimated value for pre-eruptive magma. Low-angle jets from the explosion and the estimated depth and size of a pressurized gas region suggest a shallow source inside the lava dome. The observation and results imply that segregation and accumulation of gas in a shallow conduit played a role in an increase of excess pressure immediately below the dome surface, prior to the vulcanian explosion.
言語 en
書誌情報 en : EARTH PLANETS AND SPACE

巻 65, 号 6, p. 609-621, 発行日 2013
出版者
言語 en
出版者 TERRA SCIENTIFIC PUBL CO
ISSN
収録物識別子タイプ ISSN
収録物識別子 1343-8832
DOI
関連識別子 10.5047/eps.2013.03.004
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