Rocks saturated with a fluid can be described as viscoelastic materials. The velocity and elastic moduli of viscoelastic materials increase with frequency. Therefore, the elastic rock properties that we measure at high frequencies might not resemble the observations at lower frequencies. Laboratory measurements of velocity and elastic moduli are mostly performed at frequencies higher than those of surface seismic data, but with the stress-strain experimental procedure the moduli and velocity of laboratory samples can be measured at seismic frequencies.

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