Estimating the location of a tunnel using correlation and inversion of Rayleigh wave scattering

The investigation of near-surface scatterers, such as cavities, tunnels, abandoned mine shafts, and buried objects, is important to mitigate geohazards and environmental hazards. By inversion of travel times of cross-correlated scattered waves, due to the incident Rayleigh waves, we estimate the location of a near-surface tunnel from seismic...

Imaging of material inhomogeneities with flexural waves

The detection of inhomogeneities in plates or plate-like structures constitutes a major problem in the field of non-destructive testing. For a few decades, classical techniques based on X-ray radiography have - as far as possible - been complemented and replaced by the usage of vibrations or acoustical waves due to the fact that these are less...

Wavefields and reciprocity: Proceedings of a symposium held in honour of Professor dr. A.T. de Hoop, November 20-21, 1996, Delft, the Netherlands