Migration requires antialiasing, even where the earth has zero dip. This is because the earth's horizontal layers cut across the migration hyperbola. An interesting extension is where the earth has dipping layers. There the slope parameter could be biased to account for it.
Where the earth contains hyperbolas, they will cut steeply across our migration hyperbola. Figure 14 suggests that such hyperbolas require an antialias parameter greater than unity, say antialias=2.
Figure 14 Crossing hyperbolas that do not touch. Thus the points shown are not enough to prevent spatial aliasing a line integral along one trajectory of signal on the other.