Dictionary:Tau-p mapping (τ-p)
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An unstacked seismic record or a common-midpoint gather can be described in terms of slope dt/dx = p and intercept time τ, the arrival time obtained by projecting the slope back to x = 0, where x is source–geophone distance; see Figure T-1. The transform process is also called slant stack, the Radon transform, and plane-wave decomposition. Filtering can be done on the τ-p map and the filtered result transformed back into a record. Negative offsets can be padded with zeroes to avoid wraparound problems. See Diebold and Stoffa (1981). Similar to tau-gamma mapping, where gamma is angle of emergence, gamma = γ = sin–1(pV0).