Determination of Elastic Wave Velocities in Rocks by Means of Ultrasonic Impulse Transmission.

Abstract

Velocities of longitudinal and transversal elastic waves in rock specimens have been determined from the transmission times of ultrasonic impulse (50 KC-300 KC) through them at ordinary temperatures and pressures. POISSON'S ratios have also been calculated from the velocities of the two kinds of elastic waves.
18 specimens of granite and 34 of marble, all collected from various localities of Japan, were examined. In addition, 12 apecimens of marble from Italy and various other kinds of rock, such as andesite, sandstone, tuff, etc. were also examined. The experimental results are summarised as follows:
Within the frequency range of our experiments, dispersion phenomena have been found in none of the rock specimens examined.