We investigate the temporal change of the stress state in a subducting plate through the rupture process of a large thrust earthquake and the coseismic stress change, together with postseismic changes due to plate convergence and viscoelastic relaxation process. The coseismic increase in the shear stress and the Coulomb failure stress below the the downdip edge of the main thrust zone still remains 20 years after the large earthquake, and may have enhanced the chance of occurrence of another large normal-faulting earthquake in the subducting plate.
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