stress-induced anisotropy — Oil & Gas Glossary

A situation in which the formationshear-wavevelocity varies azimuthally around the borehole, because unequal horizontal stresses in the formation have caused azimuthal variations in the stress concentrations around the borehole. These stress concentrations change the shear-wave speeds in the region surrounding the well from those in the far field, such that a characteristic response is observed in the dispersion of the