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1. n. [Geophysics, Shale Gas, Geology]

Predictable variation of a property of a material with the direction in which it is measured, which can occur at all scales. For a crystal of a mineral, variation in physical properties observed in different directions is anisotropy. In rocks, variation in seismic velocity measured parallel or perpendicular to bedding surfaces is a form of anisotropy. Often found where platy minerals such as micas and clays align parallel to depositional bedding as sediments are compacted, anisotropy is common in shales.

Synonyms: aeolotropy

Antonyms: isotropy

See: anisotropicanisotropic formationbirefringenceextensive dilatancy anisotropyheterogeneous formationraypathseismic velocityvelocity

Anisotropy - isotropy comparison
Anisotropy-isotropy comparison.

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