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Equipe Ondes et Structure

Equipe Ondes et Structure. Imagerie passive: perspectives de nouvelles techniques sismologiques. Seismic coda and ambient seismic noise - random seismic wavefields. Corrélation spatiale et fonction de Green (champ diffus ou moyenne sur une distribution de sources). scatterers. sources.

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Equipe Ondes et Structure

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  1. Equipe Ondes et Structure Imagerie passive: perspectives de nouvelles techniques sismologiques

  2. Seismic coda and ambient seismic noise - random seismic wavefields

  3. Corrélation spatiale et fonction de Green (champ diffus ou moyenne sur une distribution de sources)

  4. scatterers sources Numerical simulation in an open medium: Green function (A-B) Source averaged correlation Ballistic waves Late Coda A. Derode, E. Larose, M. Tanter, J. de Rosny, A. Tourin, M. Campillo and M. Fink (2003), Journal of the Acoustical Society of America 113, 2973-2976.

  5. BEAAR experiment

  6. Sections constructed from cross-correlations of coda from regional earthquakes (Paul et al., 2005) Symetries of the Green tensor ‘observation’ of the acausal field

  7. Comparison between earthquake records and reconstructed response

  8. Path coverage with reconstructed GF (~3000 pairs)

  9. High resolution velocity map obtained from noise (Rayleigh 7.5 s) Main geological features

  10. High resolution velocity map obtained from noise (Rayleigh 7.5 s) Sedimentary basins (S wave velocity) Main geological features

  11. 36.02 San Andreas Fault Passive tomography 36 Latitude 35.98 35.96 35.94 -120.6 -120.5 -120.58 -120.52 -120.48 -120.54 -120.56 Longitude Slice across the SAF Utiliser les ondes sismiques pour comprendre les structures internes de la Terre à toutes les échelles Croûte-lithosphére (~100 km) Analyse de données déjà acquises: (Roux et al., 2005)

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