P-wave velocity model obtained using seismic refraction tomography, with its interpretation.
Seismic reflection section where the variations in amplitude of the waves reflected at depth are observed. The continuity of the observed reflections allows the different subsurface structures to be delineated.
Example of a seismic record with surface waves and their dispersion curve in a frequency-velocity diagram. S-wave velocity model with depth.
Diagram of an electrical tomography device with the corresponding distribution of current and potential lines in the subsoil.
Model of electrical resistivity of the subsoil in an electrical tomography.
Simple diagram of how electromagnetic induction works:
- Hp, primary magnetic field.
- Hs, secondary magnetic field.
Seismic record of Roquetes (EROQ) analog seismic station for 20-21 May 1988. A swarm of earthquakes ocurred near la Seu d'Urgell is observed.