FIELD: processing of seismic data. SUBSTANCE: point S of blast coupled to geophones (R1-Rn) placed with displacement is used. First set of traces received from point of blast and registered by geophones and second set of traces with constant and collinear displacement with regard to first set is so migrated in specified range of rates that two migrated images of part of section corresponding to mentioned sets of traces are obtained. These two images are correlated with the aid of spatial two-dimensional correlation. As result deviation between employed migrations and tested rate is found. EFFECT: increased efficiency of technique thanks to generation of field of rates close to field of rates of medium. 13 cl, 12 dwg
