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 saw24b16 is a VSH model parametrized laterally in spherical harmonics up to degree 24 (Edmonds normalization) and radially in 16 unevenly spaced splines.

The model was derived with handpicked transverse component waveforms:
1. SH body waves
(S, SS, S3, S4, ScS, ScS2, ScS3, Sdiff and corresponding depth phases: sS, etc...),
2. 1st & 2nd orbit Love waves,
3. 1st & 2nd orbit higher modes.

Lateral sections of SAW24B16 in the whole mantle.
Cross sections across Africa .
East Pacific cross-sections.
Cross sections across the American continent.
West Pacific cross-sections.
3D map of the -1% isocontour in the whole mantle.
3D map of the -1.25% isocontour across 670 km in the whole mantle.
3D map of the West Pacific subduction across 670 km.
Spectral decomposition of SAW24B16.

Download

Download SAW24B16 (expanded on a 2x2 degree grid) (2.3 Mb)

Alternatively, download SAW24B16 coefficients, the code to read them, (65 Mb)
and the readme file.

For all enquiries, please contact Charles Mégnin:

pepe@seismo.berkeley.edu

Last update : 5/25/2000