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Glossary:Anisotropy
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-Differences in rock — segments showing different responses when measured.
-This is represented by covariance models that have major and minor ranges of different distances (correlation scale or lengths). There are two types of anisotropy: geometric anisotropic covariance models have the same sill but different ranges, whereas zonal anisotropic covariance models have the same correlation ranges, but different sills.