2013 Fiscal Year Final Research Report
Detection of slow-slip transients before large earthquakes
| Project/Area Number |
24740302
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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 | The University of Tokyo |
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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) |
2012-04-01 – 2014-03-31
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| Keywords | 前震活動 / ゆっくり地震 |
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| Research Abstract |
By applying a matched-filter technique to continuous seismograms recorded near source region prior to mainshocks with magnitude greater than around 6.5, we succeeded to obtain more precise images of foreshock sequence before mainshocks. As a result, we found out several foreshock sequences indicating occurrence of slow-slip transients near the initiation point of each mainshock rupture. Some foreshock sequences are characterized by earthquake migrations towards to the mainshock hypocenter, and low-b value (a constant of Gutenberg Richter law showing the relationship between the magnitude and total number of earthquakes). However, there is a significant diversity of foreshock activity from very weak to intensive behaviors, suggesting that interaction between slow-slip transients and mainshock rupture is complex.
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