## Determination of weak anisotropy parameters
from the qP wave particle motion measurements

**Ivan Psencik** **&**
**Xuyao Zheng**
### Summary

We propose an algorithm for evaluating weak anisotropy (WA) parameters
from deviations of measured qP wave particle motions from the corresponding
phase normal at individual receivers in a borehole in a multiple-source
offset VSP measurement. The formulae are derived under the assumption
of weak but arbitrary anisotropy and vertical inhomogeneity of the medium.
The formulae represent, in several respects, generalization of an algorithm
proposed by Gaiser (1990). In this contribution, only basic formulae are
presented. Tests of the proposed algorithm with synthetic data are under
preparation.

### Whole paper

The paper is available in
PostScript (109 kB)
and GZIPped PostScript (33 kB).

In: Seismic Waves in Complex 3-D Structures, Report 7,
pp. 299-306, Dep. Geophys., Charles Univ., Prague, 1998.

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