Abstract
SUMMARY The effect of stress history on acoustic velocities has been studied in a set of tests with artificially produced sandstones, so that the entire stress history of the material is known. The key steps in this stress history are cementation while the material is in a stressed state, followed by unloading under anisotropic stress conditions. The tests show that the anisotropic stresses during unloading produce acoustic anisotropy-including shear-wave splitting-which is preserved in the material after complete unloading. The anisotropy is consistent with the symmetry of the stresses, and can be related to the opening of cracks, primarily oriented normal to the minor principal stress.
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