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{{more footnotes|date=January 2013}}
[[File:EarthGravityPREM.jpg|thumb|Earth's Gravity according to PREM. Green curves show hypothetical Earths with density constant (dashed) and decreasing linearly from center to surface (stippled).]]
The '''Preliminary reference Earth model''' (PREM) is a one-dimensional model representing the average [[Earth]] properties as a function of planetary radius. It includes a table of Earth properties, including [[elasticity (physics)|elastic]] properties, [[Anelastic_attenuation_factor|attenuation]], [[density]], [[pressure]], and [[Gravity of Earth|gravity]], as a function of planetary radius.
PREM has been widely used as the basis for [[seismic tomography]] and related global [[geophysics|geophysical]] models. It incorporates anelastic dispersion and [[seismic anisotropy|anisotropy]] and therefore it is frequency-dependent and transversely [[Isotropy|isotropic ]]for the [[Mantle (geology)|upper mantle]].
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