The equations to determine the phase shift of the amplitude of the elastic Green function due to caustics in anisotropic media are presented.
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Klimes, L.: Phase shift of the Green function due to caustics in anisotropic media. In: Seismic Waves in Complex 3-D Structures, Report 6, pp. 167-173, Dep. Geophys., Charles Univ., Prague, 1997.