Study of deep mantle convection by investigating seismic scattering
| Project/Area Number |
15K05269
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | mid-lower mantle / S-to-P scattering / array analysis / heterogeneity / basaltic materials / kilometer scale / seismic wave / 下部マントル / 地震波散乱 / 地震計アレイ解析 / 科学組成 / 小規模不均質 / マントル対流 / 撹拌 / 玄武岩 / 地震波 / 散乱体 / 化学不均質 / 海洋地殻 / アレイ解析 / 散乱波 / アレー解析 |
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| Outline of Final Research Achievements |
I compiled previous observations of S-to-P scattering waves and showed the distribution of S-to-P scattering objects in the mid-lower mantle beneath circum-Pacific subduction zones. The depth distribution of the S-to-P scatterers shows that the scatterers deeper than 1800 km are extremely rare, and that those in the depth range from 1500 to 1700 km tend to be strong. I next focused on the Tonga-Fiji region and investigated the S-to-P scattering objects in detail. I obtained some observations suggesting the shape and size of the scatterers. I then investigated a strong S-to-P scatterer beneath Peru, South America, and constrained the elastic anomaly and the shape of the scatterer, which has a nearly 10% slower shear velocity and a shape of sheet as thin as 10 km.
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Report
(4 results)
Research Products
(7 results)
