Summary

A converted-wave subsurface image is the result of mapping the PS seismic data into a model of the Earth's subsurface. This mapping is performed using an imaging operator, there are several imaging operators, each of these operators creates a model for the subsurface structure. The accuracy of these models depends on the precision for each of the imaging operators. One of the simplest mapping is performed using normal moveout plus stacking. This operator is valid for a model that consists on horizontal layers embedded in a constant velocity medium. To handle more complex geological structures there are more advanced imaging operators, as for example, dip moveout, poststack and prestack time migration, and postack and prestack depth migration.