# 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. It is used extensively in quantitative seismic interpretation and rock physics. It was first described by the French mathematician, Gabriel Lamé (right).

## 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*:

The simplest expression casts *λ* in terms of bulk modulus and shear modulus *μ*:

## References

## External links

- First Lamé parameter — Wikipedia entry

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