## Numerical algorithm of the coupling
ray theory in weakly anisotropic media

**Petr Bulant** ** & **
**Ludek Klimes**
### Summary

The paper is devoted to the numerical calculation
of the frequency-dependent complex-valued vectorial
amplitudes of S waves in weakly anisotropic media
by the coupling ray theory.
The efficient and accurate method of numerical integration
of the coupling equation is proposed,
and the accuracy of the method is estimated
in order to control the integration step so, that the relative
error in the wavefield amplitudes due to the integration
is kept below a given limit.
Several quasi-isotropic approximations of the coupling ray theory
are briefly discussed and a numerical example is presented.

### Keywords

Ray theory, anisotropy, travel times, amplitudes, Green function.

### Whole paper

The
image of the paper in GIF 150dpi (500 kB)
is designed for an instant screen preview.

The reprint is available in
PostScript (1196 kB !)
and GZIPped PostScript (316 kB).

*Pure and appl. Geophys.*, **159** (2002), 1419-1435.

SW3D
- main page of consortium ** Seismic Waves in Complex 3-D Structures **.