Monofrequency data can in principle be obtained from vibrator sources. Several monochromatic sweeps at various discrete frequencies may be collectively termed a polychromatic survey. The primary motivation for a polychromatic survey is to generate benchmark data to help develop methods for extracting Q from surface seismic. Other possible applications include benchmarking nonstationary transforms, extracting time-traces with novel wavelets, obtaining signal in noisy environments and to experiment with new methods for obtaining subsurface images. An initial survey is proposed over a shallow oilfield with both surface and VSP receivers.
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