# Velocity ratio

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The ratio of P-wave velocity to S-wave velocity in a rock, often called gamma (uppercase), Γ, *V*_{P}/*V*_{S}, *V*_{P}:*V*_{S} ratio or even just 'VPVS'. An important property in rock physics and AVO analysis. Usually about 2 in water-wet clastic rocks.

## See also

Conversion formulas — edit | |||||||||||
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The elastic properties of homogeneous isotropic linear elastic materials are uniquely determined by any two moduli. Given any two, the others can thus be calculated. Key reference: Mavko, G, T Mukerji and J Dvorkin (2003), The Rock Physics Handbook, Cambridge University Press.
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P-wave velocity |
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S-wave velocity |
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Velocity ratio |
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1st Lamé parameter |
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Shear modulus |
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Young's modulus |
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Bulk modulus |
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Poisson's ratio |
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P-wave modulus |

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