| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
The outer core of the Earth consists of liquid iron alloys with light elements. However, the amounts and kinds of light elements have not been constrained yet. In this study, we performed a series of first principles calculations of density and bulk sound velocity of liquid iron alloys. By comparing them with seismic observations, we tried to constrain the amounts and kinds of light elements as much as possible. We found that hydrogen is a very potential candidate of light element since hydrogen solely can reproduce density and bulk sound velocity by seismic observations. With calculations for other light elements, we proposed combinations of light elements which are consistent with seismic observations.
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