Abstract

Ultrasonic experiments on a dry Colton sandstone placed in a triaxial pressure machine show that effective stress changes lead to distinct anisotropic velocity changes in compressional waves and shear waves. The stress imprint can be recognized from the associated velocity pattern by relating the velocities to the three normal stress directions. The ultrasonic velocities indicate that the sensitivity of the different waves to stress pre-dominantly depends on stresses applied in the polarization and propagation directions of the particular wave mode. Also, stress-induced changes in shear-wave splitting are observed.

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