δT method

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δT method In seismic investigations, a method of velocity analysis associated with the normal moveout correction (δT), which enables the root-mean-square velocity (vrms) to be calculated down to a particular reflector for which the normal incidence two-way travel time (t0) and δT are known for a given offset (x) such that vrms = x/(2t0δT)1/2. Once vrms is known, the depth (z) to the reflector can be calculated using z = vrms t0/2.

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