Development of tomography method for the critical point of stress-strain state
| Project/Area Number |
20740254
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Nagoya University |
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Principal Investigator |
ITO Takeo Nagoya University, 環境学研究科, 助教 (40377982)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 固体地球潮汐 / 海洋潮汐 / GPS / 地下構造 / 密度構造 / モンテカルロ法 / 剛性率構造 / アセノスフェア / 海洋潮汐応答 / 逆解析 / 潮汐解析 / 地震 |
|---|
| Research Abstract |
Ocean tides are a well-known phenomena resulting from periodic variations in the gravitational attraction of the Sun and the Moon. The Earth's response to ocean tidal loads (OTL) is controlled by internal variations of density and elastic parameters. In principle, observations of the Earth's OTL response can be used to constrain our models of Earth's internal structure.
The OTL response has a richer spatial structure including power at regional length scales (a few hundred kilometers) with typical amplitudes on the centimeter scale. We present the first depth-dependent model for the crust and upper-most mantle that constrains independently density and elastic moduli below the western United States and nearby off shore regions. We find that at least regionally, there is a low-density anomaly in the asthenosphere of about 50 kg/m3, corresponding to a temperature anomaly of about 300℃. Such a temperature anomaly can also explain differences in inferred elastic structure relative to globally averaged radial seismic models.
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Report
(4 results)
Research Products
(17 results)
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[Journal Article] Complex rupture during the 12 January 2010 Haiti Earthquake2010
Author(s)
R.Briggs, A.Sladen, E.Fielding, C.Prentice, K.Hudnut, P.Mann, F.Taylor, A.Crone, R.Gold, T.Ito, M.Simons
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Journal Title
Nature Geoscience
Volume: 3
Pages: 800-805
Related Report
Peer Reviewed
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[Presentation] Seismic potential on the Sumatran fault using GPS observation2010
Author(s)
T.Ito, E.Gunawan, F.Kimata, T.Tabei, M. Simons, I.Meilano, Agustan, D.Sugiyanto
Organizer
2010 Fall Meeting, American Geophysical Union
Place of Presentation
San Francisco, California, USA
Year and Date
2010-12-16
Related Report
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