The fan filter is a two-dimensional (2-D) velocity filter that removes low apparent velocity events from seismic data. The convolutional representation was derived by Embree et al (1963) and by Fail and Grau (1963). Treitel et al (1967) extended the representation to include a recursive realization. Its basic use includes migration dip suppression, multiple suppression, slant stacking, and noise suppression in stacking.

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