Elucidation of factors controlling eruption styles by bubble dynamics study

通过室内实验、模型试验和自然观测，研究了火山喷发类型的控制因素。在实验室实验中发现，火山爆发前超饱和的不均匀性控制了火山爆发的类型，或爆炸性和质量。模型证实了过饱和度的不均匀性所起的作用。我们对2011年新茂岳火山喷发的喷发物质（浮石和炸弹）进行了分析，发现喷发风格从普林尼式到火山式的转变与化学成分的不均匀性有关。

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.