## Reflection moveout approximation
for a converted P-SV wave
in a moderately anisotropic homogeneous VTI layer

**Veronique Farra** **&**
**Ivan Psencik**
### Summary

We present and test an approximate formula for the reflection moveout
of converted waves in a homogeneous VTI (transversely isotropic with
the vertical axis of symmetry) layer. For its derivation, we use the
weak-anisotropy approximation, i.e., we expand the square of the
reflection traveltime in terms of weak-anisotropy (WA) parameters.
Travel times are calculated along reference rays of converted
waves reflected in reference isotropic media. This requires
the determination of the point of reflection of the reference ray,
at which the corresponding wave converts. Presented tests indicate
that the accuracy of the formula is comparable with the accuracy of
formulae derived in a similar way for unconverted waves. The tests
also indicate that the formula can be applied not only to weakly,
but also to moderately anisotropic VTI media.

### Whole paper

The paper is available in
PDF (78 kB).

*Seismic Waves in Complex 3-D Structures*, **27** (2017), 51-58
(ISSN 2336-3827, online at http://sw3d.cz).