Dictionary:Backus filter

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(bok’ ∂s) An inverse filter that removes the effects of reverberation involving a simple water bottom. The filter's z-transform expression is

where k is the water-bottom reflection coefficient and qts is the two-way traveltime through the water layer if ts is the sample interval. See Backus (1959)[1].


  1. Backus, M. M., 1959, Water reverberations: their nature and elimination: Geophysics, 24, 233–261.

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