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  1. 防災科研関係論文

Helium isotopes in the Izu Peninsula, Japan: Relation of magma and crustal activity

https://nied-repo.bosai.go.jp/records/4323
https://nied-repo.bosai.go.jp/records/4323
8b0d6b7b-244d-422c-958b-467928ddadcf
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Helium isotopes in the Izu Peninsula, Japan: Relation of magma and crustal activity
言語
言語 eng
著者 Masao Ohno

× Masao Ohno

en Masao Ohno

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Hirochika Sumino

× Hirochika Sumino

en Hirochika Sumino

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Pedro A. Hernandez

× Pedro A. Hernandez

en Pedro A. Hernandez

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Tsutomu Sato

× Tsutomu Sato

en Tsutomu Sato

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Keisuke Nagao

× Keisuke Nagao

en Keisuke Nagao

Search repository
抄録
内容記述タイプ Other
内容記述 The relation of magma and crustal activity has been studied from spatial distribution of (3)He/(4)He ratios of gas and/or water samples over the Izu Peninsula, where significant crustal deformation associated with seismic swarm activities has been observed since 1970s. The air-corrected values of (3)He/(4)He ratios ranged from 3.5 to 8.2 R(A), where R(A) is the atmospheric (3)He/(4)He ratio = 1.4 x 10(-6), indicating that helium is mostly of magmatic origin. Among the three pressure sources proposed to explain the crustal deformation, two inflation sources beneath the inland of northeast and the mid east coast of the Izu Peninsula locate in the broad distribution of high (3)He/(4)He ratios, which supports relation of magma to the crustal uplift. In contrast, the distribution of (3)He/(4)He ratios around the tensile fault assumed in the area of seismic swarms appears not to indicate existence of significant amount of magma below the tensile fault. Alternatively, the results suggest magma below a point several kilometers south of the tensile fault. The seismic swarms are explained either by fluid pressurization of thermal water heated by this magma or by intrusion of magma to the tensile fault moved obliquely from the deep magma reservoir. (C) 2010 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH

巻 199, 号 1-2, p. 118-126
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.2010.11.001
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