# 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

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