[SSS09-P12] Investigation of tectonic stress implication in southwest Japan using three-dimensional finite element model
Keywords:southwest Japan, Philippine Sea plate, stress field, finite element method (FEM)
In this study, we make a FE mesh of southwest Japan region using meshing software Cubit ver 13.0. The upper surface of the Philippine Sea plate is based on Hirose et al (2008). To obtain the internal stress and/or deformation, we use FEM software PyLith ver 2.2.1, which is a finite-element code for dynamic and quasistatic simulations of crustal deformation. Using FEM, we try to investigate tectonics implication in southwest Japan from the stress field created by the subduction of the Philippine Sea plate. We also consider to effect of historical large earthquakes along the Nankai Trough. We simulate time evolution of stress field since about 1000 years ago. In this presentation, we will discuss the characteristic features, such as stress shadow of subducting plate, in our simulated result.