Dix formula The equation by which the interval velocity (vint) can be calculated for a zone between two depths on a seismic section. For two reflectors with reflected-ray travel times t1 and t2, and root-mean-square velocities vrms1 and vrms2 respectively, then: vint = [(t2vrms22 – t1vrms12)/(t2 – t1)]½. The stacking velocities are normally assumed to be true root-mean-square velocities but there may be occasions when it is necessary to correct them for the effects of dip.
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