f Feed-back stacking and applicatoin for velocity analysis

In the present work a new algorithm, Feed-Back Stacking (FBS), to discriminate better between primary and other interfering events, is presented. The method has been developed especially in order to improve stacking velocity determination of difficult data. For velocity analysis a new version of Constant Velocity Stack (CVS) which incorporates the FBS method is proposed. with the new type of analysis a stepwise relative reduction or change of noise events will occur. The changes itselves are used as a criterium to discriminate between the different events. The new algorithm (FBS) shares the principle of a stepwise change of events with the Superstack method (Næss, 1979), but is otherwise different. Especially, the FBS is a linear method while Superstack is not.