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Enseignements du projet E2VP pour l'utilisation des méthodes de simulation numérique 3D dans la prise en compte des effets de site dans les études d'aléa sismique

Abstract : The use of simulation to assess the site effect is often required in low seismicity areas. The "E2VP" project (Euroseistest Verification and Validation Project) launched in 2008 aimed to assess the robustness of simulation methods in complex linear 3D cases. The project E2VP was the framework of various works and advances in simulation practice. The verification step consists in checking that different simulation tools, starting from the same physical problems, lead the same results. Stringent "canonical cases" (but representative of real cases) have been defined and tested by several teams. These tests are now available online for any new team. The validation step (comparison between simulation results and actual data) involved to define their own metrics. Detailed comparisons of the " distance " between the simulations themselves and between simulations and real data have been confronted with the intrinsic variability of seismic ground motions. Simulation tools were also used to understand the physical origin of some source of variability of the site effect, including those related to the back-azimuth. The project helped evolution of the misfit between observations and simulations for different "generations" of geological models, source parameters, the model of "bedrock", and the database version. The project was rich in learnings on the global approach of site effect estimation, beyond the simple numerical simulation. MOTS-CLÉS : effets de site, simulation numérique, Euroseistest, verification, validation.
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https://hal-insu.archives-ouvertes.fr/insu-01742621
Contributor : Pierre-Yves Bard <>
Submitted on : Sunday, March 25, 2018 - 9:14:58 PM
Last modification on : Wednesday, September 16, 2020 - 2:40:03 PM
Long-term archiving on: : Thursday, September 13, 2018 - 7:13:01 AM

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Fabrice Hollender, Emeline Maufroy, Emmanuel Chaljub, Pierre-Yves Bard, Peter Moczo, et al.. Enseignements du projet E2VP pour l'utilisation des méthodes de simulation numérique 3D dans la prise en compte des effets de site dans les études d'aléa sismique . 9ème Colloque National AFPS2015, AFPS / IFSTTAR, Nov 2015, Marne-la-Vallée, France. ⟨insu-01742621⟩

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