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Aging in magma rheology
https://nied-repo.bosai.go.jp/records/2912
https://nied-repo.bosai.go.jp/records/29128726a1c5-d139-4eab-84f3-45883929039b
Item type | researchmap(1) | |||||||||||
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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
× Takahiro Miwa
× 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. |
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言語 | en | |||||||||||
書誌情報 |
en : Scientific Reports 巻 12, 号 1, 発行日 2022-12 |
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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 |