Elucidation of factors controlling eruption styles by bubble dynamics study

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We examined the controlling factors of eruption style by laboratory experiments, models and natural observations. In laboratory experiments, it was found that the heterogeneity of superstauration just before an eruption controls the eruption style, or explosivity and mass. Model confirmed the role played by the heterogeneity of supersaturation. We carried out analysis of erupted materials, pumice and bomb, from 2011 Shinmoedake eruptions, and found that the shift of eruption style from Plinian to Vulcanian is related to the heterogeneity in chemical compositions.