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Contribution à la modélisation numérique de la propagation des ondes sismiques sur architectures multicoeurs et hiérarchiques

Fabrice Dupros 1, 2
Abstract : One major goal of strong motion seismology is the estimation of damage in future earthquake scenarios. Simulation of large scale seismic wave propagation is of great importance for efficient strong motion analysis and risk mitigation. Being particularly CPU-consuming, this three-dimensional problem makes use of high-performance computing technologies to make realistic simulation feasible on a regional scale at relatively high frequencies. Several evolutions at the chip level have an important impact on the performance of classical implementation of seismic applications. The trend in parallel computing is to increase the number of cores available at the shared-memory level with possible non-uniform cost of memory accesses. The increasing number of cores per processor and the effort made to overcome the limitation of classical symmetric multiprocessors (SMP) systems make available a growing number of NUMA (Non Uniform Memory Access) architecture as computing node. We therefore need to consider new approaches more suitable to such parallel systems. This PhD work addresses both the algorithmic issues and the integration of efficient programming models for multicore architectures. The proposed contributions are validated with two large scale examples. The first case is the modeling of the 2007 Niigata-Chuetsu, Japan earthquake based on the finite differences numerical method. The second example considers a potential seismic event in the Nice sedimentary basin in the French Riviera. The finite elements method is used and the nonlinear soil behavior is taken into account.
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https://tel.archives-ouvertes.fr/tel-00580411
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Submitted on : Monday, March 28, 2011 - 11:09:49 AM
Last modification on : Friday, February 4, 2022 - 3:29:32 AM
Long-term archiving on: : Thursday, November 8, 2012 - 12:46:00 PM

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  • HAL Id : tel-00580411, version 1

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Fabrice Dupros. Contribution à la modélisation numérique de la propagation des ondes sismiques sur architectures multicoeurs et hiérarchiques. Modélisation et simulation. Université Sciences et Technologies - Bordeaux I, 2010. Français. ⟨tel-00580411⟩

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