Conducting,”open” joints, fractures, or microcracks parallel to the classic direction of maximum horizontal stress σH are commonly referred to in the geophysics literature. In a remarkable number of these studies, stress-aligned microcracks are automatically assumed to be the source of shear-wave polarization. Fractured reservoirs, being biased samples of the “near” surface, may indicate a supplementary anisotropy, caused by a set of open fractures, again with conventional interpretation. These are also assumed to be stress-aligned.

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