JpGU-AGU Joint Meeting 2020

セッション情報

印刷

[E] ポスター発表

セッション記号 S (固体地球科学) » S-VC 火山学

[S-VC43] Magma crystallization, fragmentation, and their roles on volcanic eruption

コンビーナ:三輪 学央(防災科学技術研究所)、奥村 聡(東北大学大学院理学研究科地学専攻地球惑星物質科学講座)、Pranabendu Moitra(University of Arizona)

Crystallization of magma during magma ascent in the conduit has a large impact on the dynamics of volcanic eruptions. Magma viscosity and brittleness increase with crystallization. This change of rheological properties may cause brittle fragmentation of low-viscosity basaltic magma during highly explosive subplinian and Plinian eruptions. On the other hand, crystallization may form rigid crystal frameworks, causing efficient outgassing through the interaction between the crystal frameworks and growing gas bubbles in ascending magma, resulting in effusive eruptions. This session aims to integrate information of elementary processes to develop physical models of multiphase magma ascent and eruption. In this view, we welcome innovative and multidisciplinary contributions from experimental volcanologists, numerical modelers, petrologists, and also geophysicists who develop and extend techniques to explore crystallization and bubble-crystal interactions, and their effects on fragmentation and outgassing of multiphase magma during effusive and explosive eruptions.