f Multiple elimination via inversion velocity analysis and shifted hyperbolas

The inversion processes introduced in the conventional velocity analysis yield better velocity stack gathers. Improved resolution means more accurate picking and better quality of the stacked signal. However, two problems are encountered when using these processes for multiple attenuation: 1) the high cost of inversion and 2) the construction of stacked traces from the inverted velocity-stack gather. Solutions are brought about by using shifted hyperbolas (de Bazelaire, 1988) and by implementing non-conventional stack methods.