| Project/Area Number |
24740298
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Hokkaido University |
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Principal Investigator |
YOSHIZAWA Kazunori 北海道大学, 理学(系)研究科(研究院), 准教授 (70344463)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 表面波 / トモグラフィー / リソスフェア / アセノスフェア / 地球・惑星内部構造 / 上部マントル / 地球内部構造 |
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| Research Abstract |
We developed a new method for estimating the lithosphere-asthenosphere boundary (LAB) from a 3-D shear wave model and its vertical velocity gradient, derived from multi-mode surface waves. The method is applied to a new anisotropic model of Australia, and the 3-D distribution of LAB, including its depth and thickness, has been estimated successfully. The estimated LAB beneath Australia has been discussed in detail in comparison with the radial anisotropy and earlier results from body-wave receiver functions. We have also developed a new technique for measuring inter-station phase and amplitude of surface waves based on a fully nonlinear waveform fitting. The new method has been applied to USArray, and a preliminary high-resolution phase speed models of North America was constructed. The new method allows us to collect a large number of short inter-station paths (less than 1000km), which can be of great help to enhance the horizontal resolution of shear wave models.
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