Translations:Dictionary:Fig T-13/2/en

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FIG. T-13. Transverse isotropy. (a) Wavefront with vertical axis of symmetry (TIV); (b) with horizontal symmetry axis (TIH) leading to azimuthal anisotropy; (c) phase (wavefront) angle θ and group (ray) angle for transverse isotropy; (d) elliptical wavefront where ε=–δ; in this case VNMO>Vvertical; (e) anisotropic wavefront where ε=δ; in this case VNMO<Vvertical; (f) wavefront for tilted symmetry axis; (g) wave equations for transverse isotropy.