| Project/Area Number |
26800261
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | National Research Institute for Earth Science and Disaster Prevention |
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Principal Investigator |
Miwa Takahiro 国立研究開発法人防災科学技術研究所, 観測・予測研究領域・地震火山防災研究ユニット, 任期付研究員 (80615659)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 火山灰 / 高速度カメラ / その場観測 / 凝集 / 落下速度 / 火山噴煙 / 火山噴火 / 降下 / 粒子 |
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| Outline of Final Research Achievements |
Moving of pyroclast with various velocities controls macroscopic behavior of volcanic cloud by explosive eruption. It is important to obtain knowledge of aggregation which largely affects terminal velocity of volcanic ash particles, however, there are few studies which deals with ash aggregation process in small-scale explosive eruption. This study reveals spatiotemporal variation of ash aggregation process in small-scale eruptions at Sakurajima volcano from in situ observation of falling ash by using high-speed camera imaging. The results demonstrate that efficiency of ash aggregation increases from initial to later phases of ash falling period, and bonding by external water does not dominate in the aggregation with regardless of distance between the eruptive vent and observation point.
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