also possible to regulate the absolute value of the introduced load pulses via a corresponding regulation means in such a way that it corresponds to the required measuring conditions for example the load pulse p can be regulated to a value of 50 kn via the regulation means which essentially corresponds to the wheel load of a truck and therefore allows an informative analysis of the carrying capacity of the soil layer structure 2 and in particular the upper layer 32 it is thus possible in this regard to activate the device 1 according to the present invention or the compactor 30 in such a way that it allows a reliable and reproducible study of the soil layer structure 2 and in particular the uppermost soil layer 32 fig2 shows a schematic illustration of the drivable device 1 according to fig1 showing the first and second detection devices 10 and 12 it is shown that a geophone 11 of the first detection means or device 10 is situated on the vibration roller 6 of the drivable device 1 so that it allows detection of the reflected waves which are caused by the load pulses p via the geophone 11 or the first detection means or device 10 as is known from the prior art the dynamic soil stiffness of the soil layer structure 2 located in the load introduction area 8 is thus detectable conclusions.