The conventional equation for 3D edge diffractions in the Cartesian coordinate system lacks angle information for studying the energy patterns in 3D seismic pre-stack data. Here, a new calculation method is presented for determining 3D edge diffraction coefficients in a spherical coordinate system that can formulate the coefficients according to the azimuth and emergence angles. Analysis of the edge diffraction coefficients variations with azimuth in the common shot domain reveals that the variation curves of the coefficients can be used to identify the trend of a fault. The phenomenon of polarity reversal of the edge diffraction coefficients is observed in the shot domain, and the coefficients in the common shot domain are more sensitive than in other domains.


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