| 研究実績の概要 |
The aim of this project was to develop and apply new analytical methods that allow researchers to constrain the length of time between the movement of magma underground and the eruption of magma at the Earth’s surface. Magma ascent timescales during past eruptions are recorded by the chemical compositions of crystals within erupted volcanic rocks, and the methods proposed in this study were designed to extract precise and accurate time constraints from these materials.
I have successfully developed new methods for measuring and integrating chemical composition and orientation data for volcanic crystals that are contained in lava and pumice that has been erupted during recent eruptions at volcanoes in Japan. These methods have been applied to case studies of eruptions at Shinmoedake (Kyushu), Miyakejima (Izu Islands), and Oshima-Oshima (Hokkaido). These case study tests have shown that the methods can be widely applied to volcanoes in Japan to further our understanding of the processes that trigger eruptions, and how quickly magma moves from its accumulation regions underground to the eruption vents at the Earth’s surface. Further application of the methods developed in this study will contribute to the mitigation of natural hazards during future eruptions at active volcanoes in Japan.
I have presented the preliminary results and received feedback from experts in this research field at an international volcanology conference. Related studies on volcanic crystals from volcanoes in Japan and Myanmar have been published as co-authored studies in high impact factor journals.
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