Curvelet‐based ground roll removal

Abstract

We have effectively identified and removed ground roll through a two‐step process. The first step is to identify the major components of the ground roll through various methods including multiscale separation, directional or frequency filtering or by any other method that identifies the ground roll. Given this estimate for ground roll, the recorded signal is separated during the second step through a block‐coordinate relaxation method that seeks the sparsest set for weighted curvelet coefficients of the ground roll and the sought‐after reflectivity. The combination of these two methods allows us to separate out the ground roll signal while preserving the reflector information. Since our method is iterative, we have control of the separation process. We successfully tested our algorithm on a real data set with a complex ground roll and reflector structure.