2017 Fiscal Year Final Research Report
Elucidation of activity for shallow low-frequency tremor in Nankai Trough
| Project/Area Number |
15K17745
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 浅部低周波微動 / 日向灘 / スロー地震 / 海底地震観測 |
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| Outline of Final Research Achievements |
In order to clarify the characteristics of shallow low-frequency tremor activity occurring along the Nankai Trough, we developed a method to detect events occurring near the trench axis from the land seismic station and estimate the source location. We developed new event detection method for the continuous seismic data although the accuracy of location was not improved beyond the conventional method. This method is continuously judging for the following parameter value: (1) ratio of the envelope amplitude of the low-frequency and high-frequency component, (2) ratio of each envelope amplitude and noise level. This method can be processed in quasi real time. To evaluate the performance, we applied to ocean bottom and land seismic observation data that including shallow tremor activity. As a result, the temporal change of shallow low frequency tremor activity along the Hyuga-nada to Nansei-shoto trench was obtained.
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| Free Research Field |
観測地震学
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