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{{Short description|Model representing the average Earth properties as a function of planetary radius}}
[[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|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.▼
▲[[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)
.<ref>{{cite journal| last=Dziewonski |first =A. M. | author2= Romanowicz, and B.A. | title = 1.01 - Overview| journal= Treatise on Geophysics, edited by Gerald Schubert|publisher= Elsevier, Amsterdam | date=2007 | pages =1–29, ISBN 9780444527486 | doi=10.1016/B978-044452748-6.00001-8}}</ref> It incorporates anelastic dispersion and [[seismic anisotropy|anisotropy]] and therefore it is frequency-dependent and transversely [[Isotropy|isotropic]] for the [[Mantle (geology)|upper mantle]].▼
▲The '''
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 (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|isbn=|___location=Canberra, Australia,|pages=|via=}}</ref> and ak135.<ref>{{Cite journal|last=Kennett|first=B. L. N.|last2=Engdahl|first2=E. R.|last3=Buland|first3=R.|date=1995-07-01|title=Constraints on seismic velocities in the Earth from traveltimes|url=http://onlinelibrary.wiley.com/doi/10.1111/j.1365-246X.1995.tb03540.x/abstract|journal=Geophysical Journal International|language=en|volume=122|issue=1|pages=108–124|doi=10.1111/j.1365-246X.1995.tb03540.x|issn=1365-246X}}</ref>▼
▲PREM has been widely used as the basis for [[seismic tomography]] and related global [[geophysics|geophysical]] models.<ref>{{cite
▲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
==References==
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