Experimentation at a test site for detecting voids and buried objects with seismic methods

The presence of man-made and natural buried objects - and particularly voids - in the subsurface is a recurring problem in civil engineering and landscape management. For the past few years, and in conjunction with other classical methods, we have been testing the potential of seismic methods for detecting underground voids based on the techniques of P-wave reflection (Grandjean et al., 2002) and surface-wave diffraction (Leparoux et al., 2000).