Comparison between geophysical methods fro the detection of old mine galleries or cavities

This work has been carried out on an 1+D project subsidised by the ECSC, with the aim of detecting oLd coal mine galleries at small depths. For this, the following three geophysical methods have been used: Electrical tomography, GPR and Single Geophone Refraction Profiling (SGRP). Electrical and seismic methods have been performed at Pedraforca's Coal Mine, and seismic and GPR at El Bierzo Coal Basin. Vet below it will only be shown the work done in Pedraforca, since the other two methods are still being interpreted.