| Budget Amount *help |
¥46,020,000 (Direct Cost: ¥35,400,000、Indirect Cost: ¥10,620,000)
Fiscal Year 2015: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2012: ¥29,250,000 (Direct Cost: ¥22,500,000、Indirect Cost: ¥6,750,000)
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| Outline of Final Research Achievements |
To determine the amount and distribution of water in the mantle, we have tried to determine Q value characterizing the seismic attenuation and the electric conductivity as a function of the water content. The development and installation of the short-period oscillation hydraulic system was carried out to determine the Q value of the water-bearing materials under high temperature and high pressure by in situ X-ray radiography observation. In order to determine electrical conductivity of olivine, wadsleyite and ringwoodite as a function of water, H-D inter-diffusion experiments were conducted using the synthesized single crystal pair. These results enable us to estimate the electrical conductivity at relatively high temperatures. Based on the comparison with the geophysical data, the average amount of water in mantle transition zone is found to be 0.1 wt.%, and there is a wide lateral variation. Hydrous olivine cannot account for the high conductivity anomaly in the asthesnosphere.
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