Estimation of frictional properties of the Yaeyama slow slip source region and prediction of the recurrent events by assimilating GPS data

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We installed four permanent GPS stations on the southern most Ryukyu Islandsto understand the generation mechanism of slow slip events there. GPS time series indicated that the slip did not reveal any propagation. We then developed an inversion code that can infer the temporal evolution of fault geometries. Numerical tests showed good results. In addition we developed an adjoint code to infer the frictional parameters of a plate boundary. Numerical tests showed good results, too.