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Enhancements in Ground Motion Simulation: WP3 Meeting Summary - June 1, 2007

This document summarizes the WP3 meeting held on June 1, 2007, at the Central Laboratory of Bridges and Highways in Paris. It outlines advancements in numerical tools for wave propagation, including the Finite-Volume Time Domain (FVTD) method. Key objectives revolve around improving efficiency, accuracy, and stability across various simulation methods. The report discusses fundamental principles, modeling features, and sensitivity studies while identifying key parameters for enhanced seismic simulation. Contributions from various laboratories and future actions are also noted.

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Enhancements in Ground Motion Simulation: WP3 Meeting Summary - June 1, 2007

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  1. Projet QSHA – WP3 Réunion du 01/06/2007 Laboratoire Central des Ponts et Chaussées 58, bd Lefebvre, 75732 Paris Cedex 15 http://www.lcpc.fr QSHA, Réunion du 01/06/2007

  2. WP3 - Ground motion simulation QSHA, Réunion du 01/06/2007

  3. WP3-1 Methological improvements Developments of numerical tools for wave propagation Main goals : • main features of the various methods (table) • current or potential improvements • range of application (frequency, heterogeneity, non linearity…) • comparisons (misfit criteria) : • efficiency • accuracy • stability… • very simple canonical models with well constrained features (and simple sources) QSHA, Réunion du 01/06/2007

  4. Fiche descriptive / méthode • Type/name of method: FVTD - Finite-Volume Method in the Time Domain • Contributors (labs):N. Glinsky-Olivier (Cermics/INRIA), S. Lanteri (INRIA), M. Benjemaa (INRIA), S. Piperno (Cermics/INRIA), J. Virieux (GeoSciences Azur), • Basic principle & improvements: • Principles : Finite Volumes, Unstructured grids, Centered numerical fluxes, Leap-frog time-scheme, Energy conservation, Weak treatment of boundary conditions (free surface, ABC, dynamic rupture) • Improvements : extension using Discontinuous Galerkin Finite Elements, parallel solver in development • Features: • Source/propagation (S, P, S+P): S+P • Coupled methods: coupling with PML, poss. coupling with FETD & FDTD meth • 1D/2D/2.5D/3D : 2D (3D parallel solver under development) • Time/frequency: time-domain • Direct/iterative: direct (explicit in time) • Elements size (fraction of l): 1/12 in FVTD (less in DGTD) • Model size (nb of l): • Free-surface topography: Yes • Heterogeneity: Yes • Anisotropy: Yes (future) • Material behav. (lin., NL, eq.lin): linear • Damping (NCQ, rheol.): none (possible) • Main references à remplirpour S3 !! QSHA, Réunion du 01/06/2007

  5. Tableau récapitulatif méthodes à compléter/corriger…! L=linear, EQ=equivalent linear, NL="non-linear" QSHA, Réunion du 01/06/2007

  6. Simple canonical models • Simple canyons/basins : • 2D (SismoValp) : 1 asymmetrical models + higher frequencies… is it useful to choose other 2D models ? • 3D (mainly semi-spherical, asymmetric) • Simple sources (plane waves, points sources…) • Analyze efficiency/accuracy taking into account : • Damping/attenuation, • Discretization, geometrical extent... • Constitutive laws • Simple stratification, • … • Possible link with/contribution to Spice database (http://www.nuquake.eu/SPICECVal) choice among existing models in the database ?! QSHA, Réunion du 01/06/2007

  7. WP3-2 Sensitivity studies (P-Y Bard) • Key parameters in modelling : • intermediate canonical models (for sensitivity analyses) • influence of topography description • sensitivity to source location, source dynamics, source extension… • influence of soil non linearities in 2D and 3D • influence of the physical model (variability) on response spectra (input uncertainties vs output uncertainties) • identification of the key parameters to be measured • finally, empirical description of the physical effects from theoretical results(e.g. 2D/3D aggravation factor...) QSHA, Réunion du 01/06/2007

  8. WP3-2 Sensitivity studies (P-Y Bard) (Nearly) realistic models : • Nice (WP1 : test de rugosité d’interface…) • Grenoble > modèle avec gradient + modèle à couches (pour BEM !) • Algiers • Naples……cf WP3-3 & WP3-4 QSHA, Réunion du 01/06/2007

  9. WP3-3-WP3-4 Benchmarking (E.Chajlub/E.Foerster) • Validation of developed codes based on international benchmark but not tied to ESG2006 with two geometries (Basins and margins) • Simulations performed in the Nice zone including water layer • Fully realistic models... QSHA, Réunion du 01/06/2007

  10. WP3-5 Statistical comparison(Hideo Aochi) • Variability of simulations using intensive simulations related to model variations related to source variations QSHA, Réunion du 01/06/2007

  11. WP 3-6 Lessons (J.Virieux) • To be done in S5 and S6 (2008) when comparing methods QSHA, Réunion du 01/06/2007

  12. WP 3-X ... Rapport S3 : contributions à envoyer à semblat@lcpc.fr(y compris "fiche de synthèse"pour chaque méthode) Prochaine réunion :2 ou 3 juillet 2007(avant Colloque AFPS) QSHA, Réunion du 01/06/2007

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