vertical deformation (i.e., after removing the seasonal
variation from levelling data) are inverted to estimate
interplate coupling between the subducting Philippine
Sea plate and the overriding continental plate. In the
present study, we apply the inversion technique developed
by Yabuki and Matsu’ura (1992). This enables us to elucidate the spatial distribution of the strength and the
direction of interplate coupling and to discuss the process
of strain accumulation in this complicated region.