Abstract
Numerical simulation based on the continuum mechanics is one of the potential evaluation methods for surface fault displacements. We have developed a parallel finite element method program for the evaluation. In this paper, we applied the numerical method to the simulation of 2014 Nagano-ken-hokubu earthquake in which the surface faulting was observed. We modeled a 5km×5km×1km domain around northernmost region of the surface faults including secondary faults. We applied the forced displacements on the bottom surface of the model based on the slip distribution on the primary fault and the elastic theory of dislocation. As the input slip increased, the surface slip appeared both on the primary fault and a secondary fault. Calculated surface slips were in good agreement with measured surface slip. Calculated surface slips on secondary faults were strongly dependent on the input displacements of the vicinity.
