Phase shift at caustics along rays in anisotropic media

Details Phase shift at caustics along rays in anisotropic media Phase shift at caustics along rays in anisotropic media

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.134..515b&link_type=abstract

Geophysical Journal International, Volume 134, Issue 2, pp. 515-518.

Astronomy and Astrophysics

Astronomy

4

Anisotropy, Caustic, Phase Shift, Ray Theory

Scientific paper

In isotropic ray tracing, the ray approximation to the wavefield undergoes a phase shift when the ray crosses a caustic. The cumulative number of such phase shifts along a ray is usually called the KMAH index. The sign of these phase shifts is prescribed by the sign of the angular frequency in combination with the sign convention used for the Fourier transformation. In isotropic media the KMAH index always increases by one or by two, depending on the type of caustic crossed. For (quasi-)shear waves in anisotropic media the KMAH index may decrease. This is the case if the associated slowness sheet is locally concave in one or two of its principal directions of curvature.

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