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High-Resolution Simulation of Earthquake Recurrence Enabled by Optimization for Multi-Core CPUs and Large-Scale Parallelization
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DescriptionWe have successfully developed an efficient algorithm capable of computation of N=1 million elements and 0.1 million time-steps. Strong-scaling analyses show that the algorithm exhibits the good scalability for OpenMP / MPI of 8 threads and more than 10000 cores (~200 nodes). This capacity is necessary to simulate the nationwide fault activity for the Japanese Islands with the current HPC systems. The algorithm is applied to simulate the 15 thousand years of the earthquake recurrence history along one of the largest active faults in SW Japan, the Median Tectonic line. We demonstrate that the optimized algorithm is a powerful tool enabling us to build a physics-based method applied to long-term forecast of earthquake generation.