Don L. Anderson and Adam M. Dziewonski constructed the Preliminary Reference Earth Model by jointly fitting seismic travel times, normal-mode observations, total mass and moment of inertia.[ref]
Preliminary reference Earth model by Adam M. Dziewonski and Don L. Anderson. Abstract: joint inversion and radial material properties
The model supplies mutually consistent reference profiles of elastic properties, density and attenuation. It also incorporates frequency dependence and upper-mantle anisotropy where required by the observations.
New to topics? Read the docs here!