Migration of a data impulse as a function of velocity. Three possible choices of constant velocity are shown superposed on one plane. Recall that migrated data is ordinarily displayed as a time section. Arbitrary velocity error makes no difference for horizontal bedding.
Different people have different accuracy criteria.
A reasonable criterion is that the positioning error of the energy in the semicircles should be less than a half-wavelength. For the energy moving horizontally, the positioning error is simply related to the dominant period and the travel time T . The ratio is rarely observed to exceed 100. This 100 seems to be a fundamental observational parameter of reflection seismology in sedimentary rock. The separation of the curves increases with angle.