Preliminary reference Earth model explained

The preliminary reference Earth model (PREM) plots the average of Earth's properties by depth.^[1] It includes a table of Earth properties, including elastic properties, attenuation, density, pressure, and gravity.

PREM has been widely used as the basis for seismic tomography and related global geophysical models.^[2] It incorporates anelastic dispersion and anisotropy and therefore it is frequency-dependent and transversely isotropic for the upper mantle.

PREM was developed by 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^[3] and ak135.^[4]

External links

• IRIS EMC - Reference Earth Models
• Table of values in PREM model
• Model formulas, inputs, and overview

Notes and References

1. Dziewonski. Adam M.. June 1981 . Preliminary reference Earth model . Physics of the Earth and Planetary Interiors . 25 . 4 . 297–356 . 10.1016/0031-9201(81)90046-7 . Anderson . Don L. . 1981PEPI...25..297D.
2. Book: Dziewonski . A. M. . Romanowicz . B.A. . 1.01 - Overview. Treatise on Geophysics . Gerald . Schubert . 2007 . 1–29 . 9780444527486 . 10.1016/B978-044452748-6.00001-8. 2007sse..book....1D .
3. Book: Kennett, B.L.N.. IASPEI 1991 Seismological Tables. Bibliotech. 1991. Canberra, Australia.
4. Kennett. B. L. N. . Engdahl . E. R. . Buland . R. . 1995-07-01 . Constraints on seismic velocities in the Earth from traveltimes . Geophysical Journal International . 122 . 1 . 108–124 . 10.1111/j.1365-246X.1995.tb03540.x . 1365-246X . 1995GeoJI.122..108K. free .