| Project/Area Number |
20540409
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Nagoya University |
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Principal Investigator |
FURUMOTO Muneyoshi Nagoya University, 環境学研究科, 教授 (80109264)
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| Co-Investigator(Renkei-kenkyūsha) |
HIRAMATSU Yoshihiro 金沢大学, 大学院・自然科学研究科, 准教授 (80283092)
ITO Takeo 名古屋大学, 大学院・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 |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 地震 / 地球・惑星内部構造 / 固体地球物理学 / 散乱 / 地殻・マントル物質 |
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| Research Abstract |
Scattered seismic waves provide much information about a subterranean heterogeneous structure. If we can obtain waves which are radiated from a source, back scattered, and come back to the location of the source, they should be invaluable for the study. Equivalent signals can be retrieved by the autocorrelation function of ambient ground noise. We estimated quality factors Q_<ACF> of the signals derived from the noises for 26 stations in Izu-Oshima volcanic island, Japan. It is found that the signals mainly consist of back scattered surface waves. The resultant spatio-temporal distribution of Q_<ACF> of the island in a period, Aug. 2008-Jun. 2009, demonstrates that Q_<ACF> is a useful parameter to study the shallow heterogeneous structure in the crust.
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