# Translations:Water reverberations/15/en

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where the first 0 is at time 0, the second 0 is at time 1, the third 0 is at time 2, the is at time 3, and so on. In other words, the shot occurs at time 0, the first nonzero value (the primary) occurs at time *T* = 3, the second nonzero value (the first multiple) occurs at time 6, the third nonzero value (the second multiple) occurs at time 9, and so on. The successive nonzero values (after the primary) are separated by the time parameter *T* = 3. For that reason, *T* is called the cycle time of the reverberation. Thus, the *Z*-transform of the impulsive trace is