## Determination of rock-sample anisotropy
from P- and S-wave traveltimes

**Ivan Psencik**,
**Bohuslav Ruzek**, **Tomas Lokajicek** **&**
**Tomas Svitek**
### Summary

Weak-anisotropy approximation is used to determine seismic
anisotropy of rocks from laboratory measurements of P- and
S-wave traveltimes. In the weak-anisotropy approximation,
one can invert P-wave traveltimes alone. In such a case,
one obtains 15 P-wave weak-anisotropy (WA) parameters, which
allow an approximate reconstruction of the P-wave phase-velocity
surface. In order to obtain all 21 WA parameters, S-wave traveltimes
must also be included in the inversion process. We test both types
of inversion, with P-wave data only and with both P- and S-wave data,
first on synthetic, then on laboratory data. The proposed inversion
procedure is non-iterative, it does not require analysis of the type
(phase or ray) of the velocity used. It requires knowledge of S-wave
traveltimes only without their association with the polarization.

### Whole paper

The paper is available in
PDF (953 kB).

*Seismic Waves in Complex 3-D Structures*, **27** (2017), 15-35
(ISSN 2336-3827, online at http://sw3d.cz).