Detecting and classifying sound waves esp. of vehicles using geophones e.g. for mine detection

The method uses geophones applied to the ground for the reception of ground sound waves . The wave-type detected (P- or Rayleigh-wave) is determined by the ground sound wave received using the geophones (11, 12) and is also called up as a further parameter with the adaption of the reference level (Pref). The ground sound waves determine a graph, for the dependence of the geophone output level relative to a geophone related speed, from the seismic propagation speed of the ground sound waves, for the significant types of wave. The graph is stored as a seismic propagation model with which the measured seismic propagation speed and the wave type are determined from the allocated propagation model. A corresponding adaption level (Padapt) is removed and is corrected with the reference level.