[S-TT54] ハイパフォーマンスコンピューティングが拓く固体地球科学の未来

[STT54-02] Development and application of large scale numerical simulations for earthquake generation, ground motion and non-linear soil amplification

*堀 高峰¹、市村 強²、藤田 航平²、縣 亮一郎¹ (1.独立行政法人海洋研究開発機構・海域地震火山部門、2.東京大学・地震研究所)

キーワード：FEM、地震、大規模シミュレーション

As one of the Post-K priority issue projects, named “Development of Integrated Simulation Systems for Hazards and Disasters Caused by Earthquakes and Tsunamis”, we have developed the codes of large scale numerical simulations for earthquake generation, ground motion and non-linear soil amplification based on the HPC technology for non-linear finite element simulation (Ichimura et al., 2015; Fujita et al., 2016; Ichimura et al., 2018). It is possible to calculate static deformation and elastic wave propagation for 10¹² degree-of-freedom FEM model. These codes are preparing to run on the “Fugaku” supercomputer. Furthermore, based on the developed technology, we are planning to construct high-fidelity FEM applications which government and companies will use for crustal deformation calculations, long-period ground motions, and non-linear soil amplification due to great earthquakes such as in Nankai trough, Sagami trough, etc. We are also planning to calculate large-scale viscoelastic crustal deformation and elastic wave propagation for the realistic Earth structure. These results will be used for reference of static and dynamic Green’s functions using three-dimensional heterogeneous underground structure.