Wave Equation Migrations, which include Phase Shift (WEM) and Reverse Time Migrations (RTM), address the multi-arrival problems that plague many ray-based Kirchhoff migrations, and provide more accurate images of the subsurface. In addition to resolving wave phenomena associated with complex velocity structures, Wave Equation migrations naturally incorporate the full aperture, providing operational advantages over Kirchhoff migrations when performing full volume imaging. In addition, because the migrations are wave equation-based rather than ray-based, they generally produce images with less background or operator noise than those created with Kirchhoff migrations