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  1. 防災科研関係論文

Aging in magma rheology

https://nied-repo.bosai.go.jp/records/2912
https://nied-repo.bosai.go.jp/records/2912
8726a1c5-d139-4eab-84f3-45883929039b
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Aging in magma rheology
著者 Aika K. Kurokawa

× Aika K. Kurokawa

en Aika K. Kurokawa

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Takahiro Miwa

× Takahiro Miwa

en Takahiro Miwa

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Hidemi Ishibashi

× Hidemi Ishibashi

en Hidemi Ishibashi

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抄録
内容記述タイプ Other
内容記述 Abstract

Aging, change in property depending on the elapsed time from preparation, is known to affect the rheological behavior of various materials. Therefore, whether magma ages must be examined to characterize potentially widespread volcanic phenomena related to the transition from rest to flow. To achieve this, we performed rheological measurements and microstructural analyses?on basaltic andesite lava from the 1986 Izu-Oshima eruption. The rheology shows an initial overshoot of shear stress during start-up flow that correlates with the duration and the shear rate of a pre-rest time. This indicates that the yield stress of magma and lava increases with aging. The microstructure shows that original aggregates of crystals, which may grow during crystallization, coalesce during the pre-rest period to form clusters without changing the crystal volume fraction. We conclude that the clusters are broken by shear in the start-up flow, which induces the stress overshoot. Thus, aging in magma rheology will impact the understanding of dynamic flow.
言語 en
書誌情報 en : Scientific Reports

巻 12, 号 1, 発行日 2022-12
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 2045-2322
DOI
関連識別子 10.1038/s41598-022-14327-2
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