# Dictionary:Anisotropy, weak

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{{#category_index:A|anisotropy, weak}}
Seismic velocities in anisotropic media are *initially* derived as functions of the elastic moduli. But they may be re-formulated in terms of two reference velocities, plus several (many?) non-dimensional combinations of the moduli. If these combinations reduce to zero in the degenerate case of isostropy, they may be called *anisotropic parameters*. There are several ways to do this ^{[1]}^{[2]}.

In the case of **weak anisotropy**, those relevant to a particular problem (e.g. P-wave reflections) are all much less than 1.