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Attenuation of seismic waves in dry and saturated rocks; I, Laboratory measurements



Attenuation of seismic waves in dry and saturated rocks; I, Laboratory measurements



Geophysics 44(4): 681-690



The attenuation of compressional (P) and shear (S) waves in dry, saturated, and frozen rocks is measured in the laboratory at ultrasonic frequencies. A pulse transmission technique and spectral ratios are used to determine attenuation coefficients and quality factor (Q) values relative to a reference sample with very low attenuation. In the frequency range of about 0.1-1.0 MHz, the attenuation coefficient is linearly proportional to frequency (constant Q) both for P- and S-waves. In dry rocks, Q (sub p) of compressional waves is slightly smaller than Q (sub s) of shear waves. In brine and water-saturated rocks, Q (sub p) is larger than Q (sub s) . Attenuation decreases substantially (Q values increase) with increasing differential pressure for both P- and S-waves.

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Accession: 018315020

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DOI: 10.1190/1.1440969


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