Ambient seismic wavefield: Atmosphere-Ocean-Solid Earth Coupling
| Project/Area Number |
26400448
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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 | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 常時地球自由振動 / 海洋波浪 / 海洋外部重力波 / 脈動 / 地球自由振動 / 海洋重力波 |
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| Outline of Final Research Achievements |
We analyzed globally distributed 700 broad band seismometers, and revealed the source characteristics of seismic hum. In a period from 10 to 200 s, seismic hum was excited through a topographic coupling between external ocean wave and seismic waves, whereas in a period longer than 200 s, atmospheric and/or ocean disturbances could also contribute the excitation. Moreover we inferred source distribution by analyzing body-wave microseisms with period shorter than 10 s. Based on all the observations, we showed the excitation mechanisms comprehensively.
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Report
(5 results)
Research Products
(20 results)
