[1] The University of Tokyo, Earthquake Research Institute, Department of Civil Engineering, Japan
[2] Center for Computational Science, Riken, Japan
[3] The University of Tokyo, Earthq. Res. Inst., Dept. Civil Eng., Japan
[4] Center for Advanced Intelligence Project, Riken, Japan
[5] Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics, Yokohama, Japan
[6] Research Institute for Value-Added-Information Generation, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan