| Budget Amount *help |
¥12,740,000 (Direct Cost: ¥9,800,000、Indirect Cost: ¥2,940,000)
Fiscal Year 2009: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2008: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2007: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
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| Research Abstract |
To understand submarine volcanism of the Tokara Islands, Northern Ryukyu arc, we carried out eight submarine exploration cruises with dredge survey. The volcanic rocks recovered from the sea floor and submarine flanks indicate the volcanic activities have occurred during the Quaternary and are distributed widely on the studied area. In situ rhyolitic pumice fragments are found in the vicinity of the circular submarine depressions, ～15km in diameter. Occurrence and geochemical characteristics of the recovered samples suggest strongly huge eruptions of forming a gigantic submarine caldera on the Tokara Islands. The geochemical characteristics of the samples imply that volcanisms and hydrothermal activities on the Tokara Islands could be controlled by the irregular geometry of the subducting Philippine Sea Plate.
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