Full wavefield migration (FWM) is an inversion-based imaging algorithm that utilizes the complete reflection measurements: primaries as well as all multiples, both surface and internal. Using multiples in the imaging can extend the illumination of the subsurface. In this paper we concentrate the study on the internal scattering that can be helpful in imaging structures from below that are otherwise difficult to image by primaries, i.e. an undershooting setting. This can be fruitful in the case of the obstacles, like oil-production facilities, or in the case of poor illumination, like sub-salt imaging or near-surface complexities. We demonstrate such approach on two synthetic examples.
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