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首页> 外文期刊>Earth, planets and space: EPS >Transition in eruption style during the 2011 eruption ofShinmoe-dake, in the Kirishima volcanic group: Implications from asteady conduit flow model
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Transition in eruption style during the 2011 eruption ofShinmoe-dake, in the Kirishima volcanic group: Implications from asteady conduit flow model

机译：雾岛火山群在2011年Shinmoe-dake喷发期间喷发方式的转变：稳定导管流动模型的含意

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Mount Shinmoe-dake, in the Kirishima volcanic group (insouthern Kyushu, Japan), erupted in January 2011. The eruptionstyle was initially phreatomagmatic, and then underwent a series oftransitions from sub-plinian explosions to an extrusion of lavafrom the summit crater. The purpose of the present study is toinvestigate the cause of such changes in eruption styles, focusingon the conditions for the eruption to be non-explosive and for thelava effusion to cease. To examine the conditions in the conduitand magma chamber, a numerical code is devised, based on theone-dimensional steady flow model of Kozono and Koyaguchi (2010),who modeled a dome-forming eruption. We systematically search for acondition in which the magma would not be fragmented, but theinitial volatile content in the magma chamber would remain constantand unchanged. We find that the high magma permeability and/or thehigh degree of lateral gas escape was needed for the eruption to beeffusive, and we estimate the pressure decrement at the cessationof lava extrusion.
机译：雾岛火山群（日本九州南部）的新月岳山在2011年1月爆发。喷发型最初是岩浆岩浆型的，然后经历了一系列的变迁，从次普林尼亚爆炸到从山顶火山口喷出熔岩。本研究的目的是调查喷发方式变化的原因，重点是喷发非爆炸性和岩浆喷发停止的条件。为了研究导管和岩浆室内的条件，基于Kozono和Koyaguchi（2010）的一维稳态流模型，设计了一个数值模型，他们对圆顶形成喷发进行了建模。我们系统地寻找岩浆不会破碎的条件，但岩浆室内的初始挥发物含量将保持恒定且不变。我们发现，向火山喷发物喷发需要高的岩浆渗透率和/或较高的侧向气体逸出度，并且我们估计在熔岩挤出停止时压力降低。

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