Development of monitoring methods for volcanic eruption transition based on analyses of disequilibrium record of erupted materials
| Project/Area Number |
25287141
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
嶋野 岳人 常葉大学, 環境学研究科, 准教授 (70396894)
安井 真也 日本大学, 文理学部, 准教授 (90287566)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2013: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
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| Keywords | 火山噴火 / 噴火様式 / 石基 / マイクロライト / ナノライト / 表面張力 / 気泡 / ブルカノ式噴火 / 火山 / 噴火 / マグマ / 発泡 / 脱ガス / 火山爆発 / 石基鉱物 / 火成岩 / 結晶サイズ分布 |
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| Outline of Final Research Achievements |
In order to understand the physicochemical conditions of eruption style transition in the shallow conduit, we carried out petrographic study of the products of the 2011 Shinmoedake eruption. The products formed by different explosivity can be distinguished clearly by their mineral assemblage of nanolites, although they have similar microlite characteristics. We further found pyroxene and magnetite crystals smaller than 20-30 nm in width in the lithic fragments: we defined these crystals as ultrananolites.
We also investigated the interfacial tension-driven microstructural relaxation of foamed magma by heating andesitic pumices. Internal pore microstructures of run products relaxed significantly in < 20-30 min at 1000°C through self-contraction to form low connectivity structure. This timescale corresponds to the interval of some active vulcanian explosions. The self-contraction may contribute to accumulate excess gas pressure for vulcanian explosions.
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Report
(5 results)
Research Products
(57 results)
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[Journal Article] Development of an automatic volcanic ash sampling apparatus for active volcanoes2013
Author(s)
Shimano, T., Nishimura, T., Chiga, N., Shibasaki, Y., Iguchi, M., Miki, D., and Yokoo, A.
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Journal Title
Bulletin of Volcanology
Volume: 75
Issue: 12
Pages: 773-773
DOI
Related Report
Peer Reviewed
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[Journal Article] Temporal Variation for Magmatic Chemistry of the Sakurajima Volcano and Aira Caldera Region, Southern Kyushu, Southwest Japan since 61 ka and Its Implications for the Evolution of Magma Chamber System.Submitted to the special issue of Sakurajima Volcano2013
Author(s)
TAKAHASHI M., OTSUKA T., SAKO H., KAWAMATA H., YASUI M., KANAMARU T., OTSUKI M., KOBAYASHI T., ISHIHARA K. and MIKI D.
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Journal Title
Bull. Volcanol.Soc. Japan
Volume: 58
Pages: 17-42
Related Report
Peer Reviewed
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