Amplification by the local subsurface
Amplification by the local subsurface
The local subsoil affects how strong the shaking from an earthquake will be at a particular location: the softer the subsoil, the more the seismic waves are amplified. This map shows the soil amplification of the seismic waves compared to a standard reference rock (with an average S-wave velocity in the shallower 30m, Vs30, of 1100 m/s): Values greater than 1 mean a higher amplification, values below mean a lower amplification.
