Numerical modeling for seismic cycle of great interplate earthquakes along the Nankai trough following a friction law

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The following researches were made for the numerical modeling of seismic cycle of great interplate earthquakes along the Nankai trough.(1) We implemented a friction law in FEM modeling to simulate seismic cycle in a viscoelastic heterogeneous medium. We constructed 2-D viscoelastic FEM model where a plate is subducting beneath an island arc with a crust and a mantle wedge and assigned frictional parameters down to a depth of 70 km along the plate-interface.(2) We simulated earthquake generation using a variety of friction laws based on block-spring model to compare the results with the observed statistics of earthquake occurrence.(3) We constructed the 3-D Philippine Sea plate subducting along the Nankai trough beneath southwest Japan, using the distribution of subcrustal earthquakes for the seismic slab and a tomographic technique for the aseismic slab in the deeper portion.