| Project/Area Number |
26400447
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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 (2016)
Nagoya University (2014-2015) |
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Principal Investigator |
Kato Aitaro 東京大学, 地震研究所, 准教授 (20359201)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Keywords | 低周波地震 / ゆっくり滑り / スロー地震 / ゆっくり地震 |
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| Outline of Final Research Achievements |
In the present study, we performed a systematic search for events with seismograms similar to those observed for a number of low-frequency earthquakes (LFEs), those have taken place at the down-dip extension of locked region associated with megathrust earthquake along the Nankai Trough. We constructed a new catalog of LFEs from April 2004 to August 2015 (during 11.5 years). Then, the analysis of this catalog leaded to new understanding of spatial-temporal evolution of LFEs. For example, we clearly showed that high-speed migrations of LFEs repetitively occur during a short-term slow slip events. It is interesting that the high-speed migrations of LFEs evolve in a diffusional manner; i. e., the migration front speed decays with ongoing time. Furthermore, we found out a lateral variation of slow-slip recurrence property along the deep tremor belt in Nankai Trough.
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