The theory used to develop the model is described in :
Xiang-Dong Li and Barbara Romanowicz , "Comparison of global waveform inversions with and without considering cross-branch modal coupling", Geophys. J. Int. (1995) 121, 695-709. (view Abstract)
The model saw16bv is a VSV model parametrized laterally in spherical
harmonics up to degree 16 and radially in 16 unevenly spaced splines.
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