Results of studying metamorphic rock samples (Outokumpu,Finland Borehole) by the acoustic polarization method

When studying the elastic properties of anisotropic solid media, it is necessary to determine the spatial orientation of the elastic symmetry elements. This is particularly important for randomly inhomogeneous elastically anisotropic media, such as rock. By applying the acoustic polarization method, the possibility of determining the direction of the symmetry elements of deep rock samples extracted from the Outokumpu, Finland borehole was demonstrated. The anisotropy indices of samples were obtained, calculated from the velocity values of longitudinal and transverse waves. Additional inelastic effects were revealed that are widespread in rock.