Spatio-temporal distribution of coupled area preparing Tokai Earthquake -Interaction between coupled and decoupled zones-

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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.