| Budget Amount *help |
¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2012: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
A Plinian eruption emits a large amount of magma fragments into the atmosphere for a long duration and is the most energetic and hazardous type of a volcanic eruption. This study aims at clarifying the mechanism of start-up and transition of such an eruption. The three sub-Plinian eruptions during the Shinmoe-dake 2011 eruption were chosen as the test case, because multi-disciplinary high-quality data are available. We performed combined analyses of seismic and infrasonic signals and compared the results with the material study for the eruption products, image analyses, and model experiments in the laboratory. It is confirmed that the first and the third sub-Plinian eruptions were triggered by rapid decompression due to shallow process, while the second event grew internally driven by highly vesicular magma from below.
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