| Budget Amount *help |
¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2011: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
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| Research Abstract |
Spatial and clast size distributions of boulders on the reefs at the Ryukyu Islands were investigated. Tsunami boulders were observed only in some islands of Sakishima Islands in the south, whereas boulders of storm wave origin were observed almost all islands. In the Amami Islands, we conducted numerical modeling of tsunami inundation under the constraint condition that the tsunami did not change the spatial distribution of storm wave boulders. Then, it was revealed that the seismic event at 1500 years before present were probably cause by the rupture of high-angle intraplate reverse fault. The tsunami history over the past 2000 years was investigated based on the numerical modeling in the Ishigaki Island. As a result, it was found that three large tsunamis, including the 1771 event, were occurred during this period.
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