2012 Fiscal Year Final Research Report
Structure and dynamics of the Earth's inner core boundary-The origin of hemispherical structure-
| Project/Area Number |
21340132
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
TANAKA Satoru 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 主任研究員 (60281961)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUSHIMA Masaki 東京工業大学, 理工学研究科, 助教 (20242266)
SHIMIZU Hisayoshi 東京大学, 地震研究所, 准教授 (70302619)
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| Project Period (FY) |
2009 – 2012
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| Keywords | 内核境界 / 内核成長 / ダイナモシミュレーション |
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| Research Abstract |
Hemispherical difference of the inner core reaches at least 400km below the inner core boundary. Attenuation of seismic wave passing through the Eastern hemisphere can be explained by velocity perturbation within the uppermost 200km of the inner core. The reflected waves at the inner core boundary in the Eastern hemisphere show that 2Hz components are larger than those of 1Hz. The stability of morphology at the inner core surface depends on the growth rate of the inner core. Diffusivity affects kinetic and magnetic (in some case) energies of the outer core flow near the inner core boundary.
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