Towards water content monitoring in the vadose zone from active seismic

International audience; VP/VSor Poison’s ratio classically permit imaging fluids in rocks but this strategy remains underused in near-surface applications, hence in hydrogeophysics. Yet, P-wave refraction tomography and surface-wave dispersioninversion can be combined to produce 2DVPandVSsections from a single acquisition set up. This approachrecently proved to be efficient in the study of various hydrosystems and in the imaging of the Critical Zone. Wenow suggest its time-lapse application in order to help the monitoring of water content in the vadose zone/aquifercontinuum. With both laboratory experiments and field data, we show how the temporal variations of P-wave traveltimes and surface-wave dispersion are strongly associated to the variations of water content observed locally, thusencouraging to exploit the full wealth of seismic signals in hydrogeophysics.