| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
The resistivity structure and self-potential (SP) are observed at Satsuma-iojima volcano. The resistivity structure shows the high resistive part below the summit crater and the extremely low resistive layer within the mountain. The hydrothermal numerical simulation indicates that the high resistivity part corresponds to the degassing vent where volcanic gas flows upward, and the extremely low resistive layer corresponds to the region where the condensed thermal water flows downward, respectively. The simulation also shows that the SP positive anomaly is caused by the low resistive layer, which is formed by the flow of the condensed thermal water. This indicate that the degassing activity plays an important role to produce the positive SP anomaly. This model is applied to the observation of Meakan-dake volcano and the previous study of Izu-Oshima volcano to reveal the variety of the SP anomaly according to the degree of the degassing activity.
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