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The '''preliminary reference Earth model''' ('''PREM''') plots the average of [[Earth]]'s properties by depth.<ref>{{cite journal|last1=Dziewonski|first1=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 |last2=Anderson |first2=Don L. |bibcode=1981PEPI...25..297D}}</ref> It includes a table of Earth properties, including [[elasticity (physics)|elastic]] properties, [[Anelastic attenuation factor|attenuation]], [[density]], [[pressure]], and [[Gravity of Earth|gravity]].
PREM has been widely used as the basis for [[seismic tomography]] and related global [[geophysics|geophysical]] models.<ref>{{cite book|
PREM was developed by [[Adam Dziewonski|Adam M. Dziewonski]] and [[Don L. Anderson]] in response to guidelines of a "Standard Earth Model Committee" of the [[International Association of Geodesy]] (IAG) and the [[International Association of Seismology and Physics of the Earth’s Interior|International Association of Seismology and Physics of the Earth's Interior]] (IASPEI) Other Earth reference models include iasp91<ref>{{Cite book|title=IASPEI 1991 Seismological Tables|last=Kennett|first=B.L.N.|publisher=Bibliotech|year=1991|___location=Canberra, Australia}}</ref> and ak135.<ref>{{Cite journal|
==References==
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