# P-wave modulus

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The **P-wave modulus** is an elastic modulus, not often used in rock physics interpretation. It is usually denoted *M*.

*M* is analogous to the shear modulus, *μ* and is most easily understood in acoustic terms:

Therefore *Mρ* is equal to *I*_{P}^{2}, so one could invert for it relatively easily, as one does for *λρ*. One could consider *M* as a cousin to bulk modulus, *K*, in the same way that the 1st Lamé parameter is a cousin to shear modulus, *μ*.

## 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 |