| Project/Area Number |
21540425
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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 | Hokkaido University |
|---|
Principal Investigator |
|
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| Project Period (FY) |
2009 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
|
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| Keywords | 微細不均質性 / 散乱理論 / 数値実験 / イメージング / 高周波地震波 |
|---|
| Research Abstract |
With array analysis of high-frequency seismic wave records scattered by small-scale heterogeneities in the crust, researchers have imaged their spatial distributions in the past. We show it possible to estimate some of their physical properties based on wave phenomena. In addition, we pay attention to the fact that there are both phase delay and advance, corresponding to scatterings of low-and high-velocity heterogeneities, respectively, which is in contrast with phase delay only in other research fields such as optics, electromagnetism and acoustic waves. In such a case, scattered waves are not always caustic but it can be explained by the concept of time-reversed phases depending on velocity anomalies of heterogeneities.
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