## Calculating both S waves in weakly anisotropic structures
using coupling ray theory along a single ray

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

The coupling ray theory
provides a continuous transition between the isotropic and
anisotropic ray theories, and is particularly
important at degrees of anisotropy and frequencies typical in
seismic exploration and structural seismology on all scales.
In the anisotropic-common-ray approximation of the coupling ray theory,
the coupling equation is solved along a single common reference ray,
which is traced using the average Hamiltonian of both anisotropic-ray-theory
S waves.

In this paper, isotropic-ray-theory, coupling-ray-theory,
and anisotropic-ray-theory seismograms
in a realistic weakly anisotropic model are compared.
The most pronounced differences can be observed in polarization.
Then, the coupling-ray-theory seismograms in four
models of differing anisotropy are compared.
For weaker anisotropy,
just the polarization changes with increasing anisotropy.
If anisotropy is increased further,
the clear development of S-wave splitting
can be observed.

### Whole paper

The reprint is available in
PDF (301 kB).

In: *Expanded Abstracts of 80th Annual Meeting (Denver)*,
Soc. Explor. Geophysicists, Tulsa, 2010, pp. 182-186.

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