Preliminary reference Earth model: Difference between revisions

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[[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.<ref>{{cite journal|last=Dziewonski|first=Adam M.|date=June 1981|title=Preliminary reference Earth model|journal=Physics of the Earth and Planetary Interiors|volume=25|issue=4|pages=297–356|url=https://www.cfa.harvard.edu/~lzeng/papers/PREM.pdf|doi=10.1016/0031-9201(81)90046-7|author2=Anderson, Don L.}}</ref> 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