Diffractions, statics, and downward continuation
Repeated acquisition experiments when the elevation of the surface is lowered to one scatterpoint
Diffraction estimation at various depths using surface measurements.
Assume the source and receiver arrays are lowered into the earth at the levels indicated on the left side of the geological model.
Sketch the seismic image on the following time sections for the appropriate depths.
Copy the zero-time energy to the corresponding depth section below.
Compare the migrated depth section with the original geology.
the data always remains as a time section
only the top edge of the time section is copied to the migrated section
this top edge is referred to as the imaging condition.
Estimating the downward layer diffraction from the surface diffraction using vertical elevation corrections.
Generalized diffraction estimation using all possible ray path correction.