In our last post I showed our first ever depth migration of synthetic data over a simple syncline. Although the main reflector was correctly positioned the artefacts from both the line ends and the tails of the "bow tie" were distracting from the result. The swing artefact coming in from the line ends is quite obviously due to the truncation of the event and the resulting unbalanced migration operator. The common solution to this problem is to apply some sort of a spatial taper to the input data so that the closer you get to the end of the line…