PREM

Preliminary Reference Earth Model (PREM)

1-D Reference Earth Model

full model

Year

1981

The Preliminary Reference Earth Model, Dziewonski and Anderson (1981) , is an average Earth model that incorporates anelastic dispersion and anisotropy and therefore it is frequency-dependent and transversely isotropic for the upper mantle.

A. M. Dziewonski
Department of Earth and Planetary Sciences
Harvard University
Cambridge, Massachusetts, USA

D. L. Anderson
Seismological Laboratory
California Institute of Technology
Pasadena, California, USA

Dziewonski and Anderson (1981)

Base Model

Referenced by

SAW24B16, used by GyPSum for the P-wave model and as PREM500 by SAW642AN and SAW642ANb

● The PREM model computed from the polynomial coefficients describing the model at period of 1s, Dziewonski and Anderson (1981) : in comma separated value (CSV) file format (PREM_1s.csv) or in IDV CSV format (PREM_1s.csv). Columns from left to right represent radius,depth,density,Vpv,Vph,Vsv,Vsh,eta,Q-mu,Q-kappa

● The 1s, isotropic equivalent PREM [Table II of Dziewonski and Anderson (1981) ], as used by GyPSum for the P-wave model: in its original format (StartingVpModel_PREM.txt), comma separated value (CSV) file format (StartingVpModel_PREM.csv) or in IDV CSV format (StartingVpModel_PREM_IDV.csv)

● The anisotropic PREM model used by SAW24B16: in its original format (PREM_ANISOTROPIC), comma separated value (CSV) file format (PREM_ANISOTROPIC.csv) or in IDV CSV format (PREM_ANISOTROPIC_IDV.csv)

● PREM500, a model equivalent to the elastic structure of PREM but with the Q structure of QL6, Durek and Ekstrom (1996) as referenced by SAW642AN and SAW642ANb: in its original format (PREM500), comma separated value (CSV) file format (PREM500.csv) or in IDV CSV format (PREM500_IDV.csv). Columns from left to right represent radius,density,Vpv,Vsv,Q-kappa,Q-mu,Vph,Vsh,eta

0 to 6371.0 km

Point data