1st Lamé parameter
The 1st Lamé parameter, sometimes called Lamé's first parameter, but is more usually referred to simply as lambda, λ. It is an elastic modulus and used extensively in quantitative seismic interpretation and rock physics. It was first described by the French mathematician, Gabriel Lamé (right).
It is often said that λ has no physical interpretation, and most people find it hard to visualize.
In terms of VP and VS
The 'fluid substitution perspective' casts λ in terms of bulk modulus and shear modulus μ:
|Sandstone, 10 pu||1–3|
|Limestone, 10 pu||18–53|
|Shale, 5 pu||3–24|
- First Lamé parameter — Wikipedia entry