2009 Fiscal Year Final Research Report
Investigation of excitation sources of Earth's background free oscillations from acoustic resonance
| Project/Area Number |
19740268
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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 | The University of Tokyo |
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Principal Investigator |
NISHIDA Kiwamu The University of Tokyo, 地震研究所, 助教 (10345176)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 地球自由振動 / 大気音波 / 音波 / 大気自由振動 / 音響結合 |
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| Research Abstract |
In this study we showed clear evidence of background Love waves from 10 to 20 mHz. The observed kinetic energy of Love waves is as large as that of Rayleigh waves through the whole period of analysis. We propose that the most likely excitation source is shear traction acting on a sea-bottom horizon due to linear topographic coupling of infragravity waves.
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