[S-TT41] Creating future of solid Earth science with high performance computing (HPC)

[STT41-P05] Development and application of large scale numerical simulations for earthquake generation, ground motion and non-linear soil amplification

*Takane Hori¹ (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:large scale numerical simulation, earthquake hazard, solver

Quantitative evaluation of earthquake hazards is necessary to prepare for earthquakes occurring directly beneath the Tokyo metropolitan area and along the Nankai Trough. In this study, we will construct a computing platform to carry out such evaluations, which include earthquake generation, seismic wave propagation and nonlinear soil response, by using extremely large-scale computations on "Fugaku" and implement it in the process of national evaluations of seismic hazards. The components of the computing platform have been accelerated to enable more efficient large-scale numerical analysis on "Fugaku". We have developed algorithms of matrix-vector product calculation, which is required for ultra-high-detailed, ultra-large-scale finite element seismic response analysis of important structures, which is designed for the Arm SVE architecture that comprises "Fugaku". The developed solver achieved 25.45-fold speedup from the state of the art solver on Fugaku and attained weak scaling efficiency of 93.7% from 9.391 billion DOF@578 computer nodes to 1.201 tril- lion DOF@73,984 computer nodes on performance measurement problems (Ichimura, Fujita, et al., 2022). As a preparation for the national evaluations of seismic hazards, we performed a test calculation of long-period seismic motion in the Kanto region for the Sagami Trough earthquake using "Fugaku".