## Weak contrast PP wave displacement R/T coefficients in weakly
anisotropic elastic media

**Ivan Psencik** **&**
**Vaclav Vavrycuk**
### Summary

Approximate PP plane wave displacement coefficients of reflection and
transmission for weak contrast interfaces separating weakly but arbitrarily
anisotropic elastic media are presented. The PP reflection coefficient for
such an interface has been derived recently by Vavrycuk and
Psencik (1997). The PP transmission coefficient presented in
this paper was derived by the same approach. The coefficients are given
as a sum of the coefficient for the weak contrast interface separating
two nearby isotropic media and a term depending linearly on contrasts of
the so-called weak anisotropy (WA) parameters
(parameters specifying deviation of properties of the medium from isotropy),
across the interface. While the reflection coefficient depends only on 8
of the complete set of the WA parameters describing P wave
phase velocity in weakly anisotropic media, the transmission
coefficient depends on their complete set. Tests of accuracy of the
approximate formulae are presented on several models.

### Keywords

Weak anisotropy, weak contrast interface, plane wave
reflection and transmission coefficients

### Revised version

Psencik, I. & Vavrycuk, V.:
Weak contrast PP wave displacement R/T coefficients in weakly
anisotropic elastic media.
PAGEOPH, **151** (1998), 699-718.

In: Seismic Waves in Complex 3-D Structures, Report 6,
pp. 241-261, Dep. Geophys., Charles Univ., Prague, 1997.

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