We propose an algorithm for local evaluation of weak anisotropy (WA) parameters from mesurements of slowness vectors and/or of deviations of measured qP wave particle motions from the slowness vectors at individual receivers in a borehole in a multi-azimuthal multiple-source offset VSP experiment. The formulae are derived under assumption of weak but arbitrary anisotropy and lateral inhomogeneity of the medium. The formulae represent generalization of an algorithm proposed by Psencik and Zheng (1998) for vertically inhomogeneous media. In this contribution, only basic formulae are presented. Tests of the proposed algorithm with synthetic data are under preparation.
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