# 1st Lamé parameter

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## In terms of

The **1st Lamé parameter**, sometimes called Lamé's first parameter, or lambda *λ*, is an elastic modulus and used extensively in quantitative seismic interpretation and rock physics.

## In terms of *V*_{P} and *V*_{S}

## Other expressions

*λ* can also be expressed in terms of Young's modulus, *E*, and Poisson's ratio, *ν*: