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Etude de la zone critique : Variations temporelles des données sismiques

Abstract : Near-surface seismic methods are mainly used to determine the geometrical characteristics of hydrosystems. However, they have been recently suggested to investigate the mechanical properties of the Critical Zone (CZ) influenced by water content, thanks to the combined estimation of P- and S-wave velocities. We propose here a time-lapse application of this approach. Two seismic acquisitions were carried out under distinct hydrogeological conditions along the same line at the Ploemeur hydrogeological observatory (France). Vertical component seismic data were recorded to extract: (i) P-wave first arrival times and (ii) Rayleigh-wave phase velocities. The significant variations with time and space, of both datasets, indicate marked changes in mechanical properties of the CZ to be compared with hydrological data.
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Submitted on : Tuesday, December 20, 2016 - 3:07:17 PM
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Geofcan 2016 Dangeard_et_al.pd...
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  • HAL Id : insu-01420377, version 1


Marine Dangeard, Sylvain Pasquet, Ludovic Bodet, Roger Guérin, Laurent Longuevergne, et al.. Etude de la zone critique : Variations temporelles des données sismiques. GEOFCAN 2016, BRGM, Nov 2016, Orléans, France. ⟨insu-01420377⟩



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