2012 Fiscal Year Final Research Report
Spatio-temporal distribution of coupled area preparing Tokai Earthquake -Interaction between coupled and decoupled zones-
| Project/Area Number |
23740336
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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 | Shizuoka University |
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Principal Investigator |
IKUTA Ryoya 静岡大学, 理学部, 助教 (60377984)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 地殻変動 / 海底変動 |
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| Research Abstract |
We studied spatiotemporal distribution of inter-plate coupling beneath the Nankai Trough using three dimensional GPS coordinates. First we developed an effective method to remove common mode error between time series of different GPS stations. Next we took difference between a couple of every 10 days-long averages with a gap of 1 week. The difference data set was used to deduce inter-plate coupling distribution by Bayesian inversion method. As a result, we successfully detected short-term slow slip events associated with activations of deep low frequency tremors occurring at down dip extension of the coupled area. Long term slow slip events beneath Lake Hamana and Bungo Channel as well as constant draggingby the subducted slab were also detected.
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