| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
This study aimed to understand the mechanism of volcanic eruption, especially the mechanism how eruption sequence evolves, based on our automatic and continuous sampling system of airfall ash at some active volcanoes such as Sakurajima volcano, South Japan. We are successful in continuous sampling of volcanic ash at Sakurajima volcano for about six years but with small number of missing. We have derived an empirical relationship between ash sample volume and dry weight for the sake of immediate calculation of ash fall rate. We also found a relation between changes in strain and characteristics of eruptive products (color values, composition, etc.) for long-term evolution of magmatic system at Sakurajima. On the other hand, for very short-term activity, we found correlations between strain and the properties of ash sample that changes with ash fall rate during one explosion.
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