This method produces the output as a function of the incidence angle at the reflector, and not as a function of offset ray-parameter. This makes the results more open to interpretation, and potentially allows for consistent quantitative AVA analysis if the amplitudes are handled correctly during migration (91). This method generates angle gathers after and not during migration, thus enabling us to shuttle between the angle and offset domains without re-migrating the data. Since the transformation to the angle-domain is separated from the migration itself, this method can be used both for shot-geophone downward-continuation migration, as exemplified here, or for shot-profile downward-continuation migration (78). The method can also be generalized to the cases of converted waves (83), or two-way wave propagation (11). This method enables inexpensive regularization of the angle-domain leading to gathers with events that vary smoothly along the angle axis. The increased S/N ratio helps reveal weak events that would otherwise be harder to interpret.