Japan Geoscience Union Meeting 2021

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S (Solid Earth Sciences ) » S-VC Volcanology

[S-VC31] Dynamics of volcanic eruptions and their physical and chemical processes

Sat. Jun 5, 2021 5:15 PM - 6:30 PM Ch.16

convener:Yujiro Suzuki(Earthquake Research Institute, The University of Tokyo), Atsuko Namiki(Graduate School of Environmental Studies, Nagoya University), Masatoshi Ohashi(Earthquake Research Institute, the University of Tokyo)

A Volcanic eruption is a hazardous phenomenon that results from a sequence of coupled processes, including storage in the subsurface and ascent to the surface. The volcanic gas exsolving from the ascending magma generates bubbles, which influence both the potential energy of the magma (density) and its resistance to flow (viscosity). Bubbles can sometimes deform and/or fragment the surrounding magma, leading up to explosive eruptions that develop volcanic plumes and/or pyroclastic flows. A broad range of approaches is required to tackle these processes and better understand the factors that govern the physics of explosive eruptions. We welcome contributions from interdisciplinary approaches, including, geophysical observations of active/quiet volcanoes, geochemical measurements of eruptive products, theoretical approaches, and numerical simulations, and laboratory experiments designed to explore the fundamental processes underlying explosive volcanism.

5:15 PM - 6:30 PM

[SVC31-P06] Conduit ascent process of mafic subplinian eruption: Constraints from plagioclase microlites in the 1235 scoria of Kirishima-Ohachi volcano, Japan.

*Yoshiharu Iwaki1, Hidemi Ishibashi1, Natsumi Hokanishi2, ATSUSHI YASUDA2, Toru Ishikawa3, Taketo Shimano4 (1.Shizuoka University Graduate School of Integrated Science and Technology, 2.Earthquake Research Institute, University of Tokyo, 3.Kirishima Geopark Council, 4.Graduate School of Environment and Disaster Reserch, Tokoha University)


5:15 PM - 6:30 PM

[SVC31-P10] 3D crystal size distributions of pyroxene nanolites plotted against short-axis length reflect magma ascent dynamics

*Shota Okumura1, Mayumi Mujin2, Akira Tsuchiyama3,4, Akira Miyake1 (1.Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, 2.Division of Earth and Planetary Materials Science, Department of Earth Science, Tohoku University, 3.Research Organization of Science and Technology, Ritsumeikan University, 4.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences)


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