Principle of Method

The modern refraction seismic technique of diving wave tomography images the velocity gradient field continuously, thereby pin-pointing zones of low and high rock rigidity

Applications

• mapping of decompacted zones (tunnel construction, landfill sites)
• determination of rippability
• mapping of permeability of gravels
• localisation of fracture zones
• mapping of the bedrock surface

Refraction seismics are often combined with reflection seismics (hybrid seismics).

Example of a refraction seismic profile for the prospection of mineral water:

Example of the velocity field by refraction tomography for detecting decompaction zones along the traject of a planned tunnel: