Abstract
The paper describes studies made on absorption of dilatational waves in rock specimens using ultrasonic waves. It is observed that the coefficients of absorption in rocks show a trend to increase with decrease in wave velocity. Absorption is found to decrease with increase in pressure and approach a saturation value. The fractional decrease in absorption due to pressure is more than that of the corresponding increase in velocity. The change is found to be appreciably dependent on the value of the wave velocity in the specimen. The coefficients of absorption at different wave frequencies were measured using continuous simple harmonic waves. Results of the measurements in the wave frequency range 0.4–1.0 mc/sec in specimens of different wave velocities confirm that the mechanism of elastic wave absorption in rock media is of elastic hysteresis type.
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