The block move sum normal moveout correction

A new normal moveout technique designated Block Move Sum (BMS) is described. In theory it better approximates the ideal inverse NMO process than do currently utilized techniques. Data blocks are corrected as units thus eliminating trace stretching and reducing trace distortion. The proposed correction and two common production methods are applied to both synthetic and real data and compared. Crosscorrelations calculated from synthetic seismogram data suggest the BMS method creates the least signal distortion. For field CDP data, the BMS does improve signal resolution for events at early times.