A derivation is presented of the response of an embedded thin layer to a vertically incident seismic pulse. The reflected pulse has the shape of the time derivative of the incident-wavelet, and its amplitude is proportional to the two-way traveltime in the thin layer and to a factor depending upon the ratio of acoustic impedances. The influence of spectral bandwidth on interface resolution and thin-layer response is investigated by means of zero-phase signals, and a filtering philosophy is proposed which enables thickness estimation either from amplitude or from peak-to-trough time.

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