TSUNAMI SIMULATION OF MEGATHRUST EARTHQUAKES ALONG THE NANKAI TROUGH USING ADAPTIVE MESH REFINEMENT METHOD

Abstract

 This study conducted numerical simulations of Nankai-Tonankai earthquake tsunamis using an Adaptive Mesh Refinement (AMR) method. The AMR model dynamically changes spatial and time resolution with each calculation step. First, to validate the numerical model using the AMR method, the simulation results were compared with the fixed resolution model. The results of the AMR model were in good agreement with those of the fixed grid model. Next, sensitivity analysis was performed by changing the refinement criteria of the AMR method to optimize the refinement scheme. The computational efficiency was significantly improved with constraining the refinement level depending on the water depth.