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Warning: Display title "Dictionary:<i>V<sub>S</sub>/V<sub>P</sub></i>" overrides earlier display title "Dictionary:VS/VP".

The ratio of velocities of S-wave to P-wave. This ratio is sensitive to lithology or interstitial fluid. The ratio is about 1/2 for most rocks, is larger for gas saturation, and zero for fluids. Measurements of Poisson's ratio give equivalent information.