| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Outline of Final Research Achievements |
We constructed a three-dimensional thermal convection oceanic plate subduction model in which the Pacific plate and the Philippine Sea plate are subducting simultaneously in the Kanto-Tohoku region. The temperature and the flow fields due to the interaction between the two plates were clarified, and it was shown that the intraslab earthquake occurrence region could be well explained by the dehydration region predicted from the model using the phase diagram.
We also analyzed intraslab seismicity in the Philippine Sea slab and estimated 3D heterogeneous structure in the mantle wedge of central Japan. Obtained results revealed the locations of slab dehydration and distribution of fluids and melts toward active volcanoes in central Japan, providing a better understanding of fluids transportation paths in the mantle wedge.
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