Abstract
Changes in wave velocity in rocks are mainly caused by pressure and depend on porosity and pore filling. For terrestrial and lunar rocks two formulae can be stated which are comparable with each other and the coefficients of which can be determined from wave velocity and uniaxial stress measurements. The behaviour of rocks may be compared with dynamic phenomena in the earth's crust, and in particular with pre-rupture phenomena (shocks, etc.) in seismic regions. The coefficient K 0 of imperfect bonds in rock increase with the number of shocks and brings about a decrease in wave velocity in seismic regions. The variations in wave velocity are connected with changes in electrical and thermal conductivity and with magnetic variations.
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