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Reference.org
Seismic anisotropy
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<p>Seismic anisotropy is the directional dependence of the velocity of <a href="/facts/Seismic_wave/1JTeLfac">seismic waves</a> in a medium (<a href="/facts/Rock_(geology)/FXCJkmop">rock</a>) within the <a href="/facts/Earth/HLLmDfj0">Earth</a>. </p>