Summary

A new method is introduced for the transformation of surface data into pseudo Vertical Seismic Profiles (VSP) by a numeri-cal procedure. The pseudo VSP generated with only a macro model contains all the details of the initial seismic surface data. This is in contrast with VSP forward modeling which needs all the details of the subsurface model as input. A comparison between forward VSP modeling and pseudo VSP generation is presented. The used algorithm is sensitive to errors in the macro subsurface model. This sensitivity can be used as a new criterion to verify the correctness of the macro subsurface model. A 3D data volume representation is an extra aid in rhe interpretation of various events in different cross sections (shot record, VSP and snapshot)