| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
Fractures are created at the shallower part of oceanic plates due to the stress field. The orientations of aligned fractures can be investigated through the anisotropy of seismic velocity. In this study, we apply a layer-dependent splitting analysis to seismic records obtained at ocean bottom seismometers deployed at seaward and near-trench regions. As a result, the basement and Moho were not clear near the trench compared to seaward region, and the fast polarization direction near the trench is oriented to the trench-parallel direction. We interpret that such complexities are created by aligned cracks and normal faults, fluid presence, and petit-spots activities near the trench.
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