Preliminary reference Earth model: Difference between revisions

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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<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.

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]].

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>{{citeCite journalbook|title=IASPEI 1991 Seismological Tables|last=DziewonskiKennett|first=Adam MB.L.N.|author2publisher=AndersonBibliotech,|year=1991|isbn=|___location=Canberra, DonAustralia,|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=PreliminaryConstraints referenceon Earthseismic model|journal=Physicsvelocities ofin the Earth andfrom Planetary Interiorstraveltimes|dateurl=Junehttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-246X.1995.tb03540.x/abstract|journal=Geophysical 1981Journal International|language=en|volume=25122|issue=41|pages=297–356108–124|doi=10.10161111/0031j.1365-9201(81)90046246X.1995.tb03540.x|issn=1365-7246X}}</ref> Other Earth reference models include IASPE91.

==References==