Quite recently Peter Hubral published a short note in which he described a special, very perspicuous stacking method which, starting from the records of a line survey, produces true amplitude reflections for “normal waves,” as defined in his Introduction. In the following I want to supplement Hubral's note by showing the analytical connection with Hubral's earlier paper (Hubral, 1983) and the additional short note by Krey (Krey, 1983). My present investigation will be two-dimensional (2-D) as is that in the subject paper; an extension to the three-dimensional (3-D) case is conceptionally easy for the following analytical derivation as well as for Hubral's note. Besides a basic confirmation of Hubral's findings, I shall show that the result of Hubral's method has still to be multiplied by ω1/2 in the 2-D case and by ω1 in the 3-D case in order to obtain the precise result. Here ω is the frequency. Moreover the angle of emergence α of the zero-offset raypath has to be taken into account.

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