The main aim of the study was an attempt of determination of the stiffness modulus of sandy subsoil based on analysis of data recorded during the measurements of vibrations conducted at the surface of the ground. Field tests of acceleration of vibrations were carried out at measuring points located at a distance of 5 m and 10 m from the source of vibration. The Light Falling Weight Deflectometer was the source of the vibration, characterized by high repetition rate of pulse parameters. Measurements of vibration were executed using measuring system produced by Brüel & Kjær. The evaluation of the subsoil stiffness was made on the basis of obtained results in two ways. The first method was based on measuring the time of movement of the Reyleigh wave between the measuring points. The second method was to use the own author’s computational program. The program based on the finite difference method enabled the description of wave propagation in the ground under impact load.

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