Abstract:Apparent velocity and polarization are two important properties of seismic wave. The comprehensive consideration of the two properties helps to separate out the main energy in seismic wave field consisting of multiple components. In order to improve wave field separation, we consider linearity of particle movement to design a 2-D nonlinear polarization filter in τ-p domain, which enhances the main energy wave field, but reduces and removes other waves and noises. τ-p transform in frequency-space domain need not resample and interpolate raw seismic data, so that the computation is fast and accurate. What is more, this method causes no alias and end point effect when parameters satisfy necessary requirements.