Abstract
The high-frequency wave field of a point source situated near the interface of two homogeneous media and placed in a faster medium is considered. A description of the wave field in a neighborhood of the critical ray in a slower medium is found by the parabolic-equation method. The result involves a Pearcey-type integral. The approach is not based on the Fourier method and can be generalized to inhomogeneous media with curved interfaces. Bibliography: 14 titles.
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