| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
In this study we have newly constructed simulation programs of mantle convection near the subduction zones, by extending our own techniques. The new programs have been utilized for numerical experiments on the dynamic behaviors of the slabs of cold descending plates near the base of the upper mantle. The series of our experiments demonstrated that the formation and avalanche of stagnant slabs are strongly related with the trench retreat particularly through its temporal changes. These findings may further imply that our study can offer important clues to the understanding of tectonic histories of subduction zones (such as the trench migration and back-arc opening), by properly combining with the observations on the morphology and behavior of subducting slabs in the mantle transition zone beneath them. Through our attempt of constructing these simulation programs, we have also developed new numerical techniques toward advanced modeling of mantle dynamics.
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