| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
Water-chilled bombs collected from the Miocene deep marine successions of the Shimane Peninsula have a vesicle-number density distribution and a porosity indicative of a Strombolian-like eruptive process. In a Miocene shallow-marine pyroclastic cone of the same Peninsula, scoria-agglutinate fills the conduit but the correlative eruption-fed scoria-density-current deposits are much finer-grained with minor projectiles, suggesting water-ingestion and explosive water-particle interactions in the plumes or currents. Pyroclastic density current deposits from Katsumayama volcano are composed mainly of rhyolitic perlite clasts, being produced through water quenching, hydration-induced cracking and explosive heating water to steam. These case studies show external water play an important role in explosive subaqueous eruptions.
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