Gregor T. Baechle, Ralf J. Weger, Gregor P. Eberli, Jose L. Massaferro, Yue-Feng Sun; Changes of shear moduli in carbonate rocks : Implications for Gassmann applicability. The Leading Edge ; 24 (5): 507–510. doi: https://doi.org/10.1190/1.1926808
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In laboratory experiments we measured the saturation effects on the acoustic properties in carbonates and the results question some theoretical assumptions. In particular, these laboratory experiments under dry and wet conditions show that shear moduli do not remain constant during saturation. This change in shear modulus puts Gassmann's assumption of a constant shear modulus into question and also explains why velocities predicted with the Gassmann equation can be lower or higher than measured velocities.