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The goal of vibroseis data acquisition and processing is to produce seismic reflection data<br>with a known spatially-invariant w avelet, preferably zero-phase, such that any variations in<br>the data can be attributed to variations in geology. It is impossible to achieve this goal unless<br>the data are deconvolved for the true ground force. Determination of the true ground force<br>using current methods is at best approximate. A combination of approaches may lead to a<br>more satisfactory approximation.