These models are published as part of Global models of surfwave wave group velocity (Larson & Ekström, 1999).
This figure is also available as a PDF file for printing. The projections are equal-area: the large one is an Eckert VI projection and the polar ones are Lambert Azimuthal. The figure was created using the Generalized Mapping Tools (GMT) and converted with Ghostscript and the NetPBM library.
Erik Larson
Copyright ©1999, all rights reserved.