| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Outline of Final Research Achievements |
From this research, the researcher got the following two results.
1. One of the faults along the Median Tectonic Line (MTL) transects a terrace deposit at Hiji Outcrop. We extracted volcanic glass shards from the deposit and determined bulk chemical composition of the glasses. The result is that the glasses are correlative with those from the Ontake tephra (On-Pm1), which was erupted at 100 Ka. Accordingly the MTL fault was reactivated as an active fault.
2. We collected fault gouges from several outcrops of the MTL and examined K-Ar ages and illite polytype component from four grain-size fractions divided. As a result, the fault gouges are formed by hydrothermal alteration associated with major fault movement at about 15 Ma , which is correlative with the beginning of the collision of Izu arc against the Honshu arc.
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