|Budget Amount *help
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2013: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2011: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2010: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
|Outline of Final Research Achievements
Using Hi-net borehole data, we showed that heat flow values are high and low in the uplifted and subsided regions, respectively, in southwest Japan. Constructing a 2D box-type thermal convection model, such heat flow distribution can be explained by the effects of frictional heating on the plate interface and temperature increase and decrease due to erosion and sedimentation, respectively. Developing a 2D box-type thermal convection model with subduction of two oceanic plates simultaneously, we elucidated that low heat flow in the Kanto district can be brought by subduction of the cold Philippine Sea plate.
Using seismic waveforms obtained by nationwide seismic network in Japan, we estimated a 3D attenuation structure for P-waves in the Kyushu district. Based on the results, we concluded that fore arc mantle wedge is serpentinized, and high attenuation areas are distributed in the back arc mantle wedge.