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A seismogram is the result of the impulse response of the earth convolved with the shot impulse. Synthetic seismogram examples showing the convolution operators for models containing up to three near-surface layers are given. Models representing Libyan conditions were constructed, and their convolution operators studied. In some places, the effect on sharp impulses was to "stretch out" the impulses giving rise to reverberatory records. Also the shape of the convolved impulses differed dramatically down the line as subsurface conditions changed.
A deconvolution process, to remove the effects of the earth filter, is applied to the seismograms and the final deconvoluted traces are shown for comparison. The deconvolution operator is determined on each trace. Deconvolution is discussed also in terms of shaping a long pulse into an impulse.
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