Japan Geoscience Union Meeting 2015

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Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS26] Seismic wave propagation: Theory and Application

Tue. May 26, 2015 9:00 AM - 10:30 AM 103 (1F)

Convener:*Tatsuhiko Saito(National Research Institute for Earth Science and Disaster Prevention), Hisashi Nakahara(Solid Earth Physics Laboratory, Department of Geophysics, Graduate School of Science, Tohoku University), Jun Matsushima(School of Engineering, The University of Tokyo), Kiwamu Nishida(Earthquake Research Institute, University of Tokyo), Kazuya Shiraishi(JGI, Inc.), Chair:Hiroshi Takenaka(Department of Earth Sciences, Graduate School of Natural Science and Technology, Okayama University), Takayuki Miyoshi(Japan Agency for Marine-Earth Science and Technology)

10:15 AM - 10:30 AM

[SSS26-06] Scheme for computing seismic wave propagation in a 3D round sub-global earth model

*Hiroshi TAKENAKA1, Genti TOYOKUNI2, Takeshi NAKAMURA3, Masanao KOMATSU1, Taro OKAMOTO4 (1.Graduate School of Natural Science and Technology, Okayama University, 2.Graduate School of Science, Tohoku University, 3.Japan Agency for Marine-Earth Science and Technology, 4.Graduate School of Science and Engineering, Tokyo Institute of Technology)

Keywords:seismic wave, simulation, finite-difference method

We propose a "quasi-Cartesian" finite-difference scheme to compute seismic wave propagation for a very large region model of sub-global scale beyond regional and less than global ones, where the effects of roundness of Earth. This new scheme solves the elastodynamic equations for three-dimensionally heterogeneous (3D) spherical earth model in the "quasi-Cartesian" coordinate system similar to a local Cartesian system, instead of the spherical coordinate system, with a staggered finite-difference method (FDM) which is the most popular in seismic motion simulations for local to regional scale models. The developed scheme can be easily implemented in 3D Cartesian FDM codes by changing a very small part of the codes. It may be able to open a window for multi-scale modelling of seismic wave propagation in scales from sub-global to local one.