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Types of anisotropic media with transversely isotropic layers, classified based on the orientation of the symmetry axis perpendicular to the layers: a) vertical transverse isotropy (VTI), b) horizontal transverse isotropy (HTI), and c) tilted transverse isotropy (TTI).
Seismic anisotropy is the directional dependence of the velocity of seismic waves in a medium (rock) within the Earth.
