Abstract: In prestack depth migration with wave equation, the input seismic data grid is required to be regularized grid. However, during the field seismic data acquisition， the visual variation occurs in acquisition system， due to complex landscape or relief and seismic coverage times. Such alias produced by sparse samples along the on-line should be interpolated between tracks. This paper deals with the variance between the seismic line and the coordinate orientation by rotation transform and realizes the auto pickup of events by Viterbi algorithm, obtaining satisfactory results. These two methods are feasible to preprocessing of prestack depth migration of wave equation.

Key words: wave equation, acquisition system, rotation, event, preprocessing