| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Research Abstract |
The Median Tectonic Line (MTL) active fault zone extends for about 190 km along in Shikoku, southwest Japan. The MTL is an arc-parallel, right-lateral strike-slip fault related to the oblique subduction of the Philippine Sea plate beneath the Eurasian plate along the Nankai trough. Though the MTL is the most significant active tectonic feature on shore in southwest Japan, its Late Quaternary slip rate, slip vector and fault plane have been estimated at very few locations. We mapped offset Late Pleistocene fluvial terrace surfaces and dated them using carbon 14 dating and tephrochronology. The cumulative offset (110±10m) and the age of the inner edge (15ka) on the Ikeda fault yields an average slip rate of 7.3±0.7mm/yr. High resolution digital elevation model (DEM) of a Late Pleistocene terrace riser were collected by using photogrammetry to characterize the cumulative fault slip vector across the Chichio fault. The reconstructed vectors based on DEM, to be similar direction are shown that the vertical displacement is about one twelfth to one fifteenth times as large as the horizontal displacement. The deformation of fluvial terrace across the Chichio fault is reproduced by a model with a high angle northward dipping fault plane.
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