Ultrasonic compressional- and shear-wave attenuation in water-saturated Carrara Marble increase with increasing crack density and decreasing effective pressure. Between 0.4 and 1.0 MHz, empirical linear relationships between 1/Q and crack density CD were found to be:CD = 1.96 + or - 0.63 X 1/Q,for compressional waves andCD = 6.7 + or - 1.5 X 1/Q,for shear waves.

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