f Velocity independent time migration and velocity analysis

Considerable difficulty in the evaluation of vetocity information occur in areas of complex subsurface structure due to the presence of diffractions, sideswipe reflections, and multiples. Conventional seismic processing can not adequately overcome these difficulties but is accepted as a key element for vetocity macro model estimation based on the identification of major reflectors using time migrated data , which are much Basier to interpret than the unmigrated data .