Abstract
Employing the pulse travel time technique, many measurements on crustal rocks comprising 25 rock types were attempted and experimental data on longitudinal and shear velocities were collected. Velocity measurements as a function of directional propagation leading to the evaluation of the degree of anisotropy; and the results on the density and attenuation in these rocks were also obtained and the ranges noticed in such values are included and discussed. Results on five rock types that were subjected to a uniform pressure of about 2 kilobars are also presented. Studies under uniform pressure, covered the aspects of velocity and amplitude changes; the effect of loading and unloading; and changes due to cyclical loading. A steady increase in wave velocity and amplitude was observed in these pressure studies. A considerable flattening of the pressure-velocity curves was noticeable even under these low pressures showing the effect of compaction and the elimination of porosity.
