Rock samples from Açu sandstone, Potiguar Basin,<br>Brazil, were submitted to measurements of P and S<br>wave velocities. It was done under several conditions,<br>combining application of constant confining pressure<br>and increasing axial deviatoric stress, with<br>simultaneous monitoring of both axial and transversal<br>strains, that allows correction on rock density and<br>elastic moduli. By using the appropriate model of<br>stress-induced anisotropy for the data set obtained in<br>the experiments, third-order elastic constants for the<br>sandstone were estimated. These estimates, for each<br>rock specimen, led to velocity modeling for the<br>sandstone along arbitrary directions and different<br>stress magnitudes. This procedure yielded the<br>quantification of the velocity anisotropy on the Açu<br>sandstone under the application of incremental stress fields.


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