Filling in the Model Spectrum with Multiples

The previous sections derived the model resolution equations for diving waves, primaries, and diffractions. What are the resolution benefits for migrating multiples, particularly prism waves or interbed multiples? The short answer is that their associated central rays are longer than those of primaries, so their first-Fresnel zones should be wider. This means that they can reconstruct low-wavenumber and intermediate-wavenumber models that can only be inverted with primaries at impractically wide source-geophone offsets or using sources with unrealistic low-frequencies.