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Low frequency seismic responses have considerably different characteristicsthan conventional band responses and require acquisition technologies that arecapable of meeting far greater requirements. Seismic sources must deliverforces at lower frequencies that are considerably larger than the forcesdelivered by modern sources at conventional band frequencies in order toachieve comparable signal-to-noise ratios for many traditionalinterface-related seismic responses. Source efforts that are only comparable toconventional band source efforts are not adequate. Low frequency seismicresponses from certain non-interface related impedance changes may be greater,but still require improved low frequency seismic sources.

Low frequency seismic responses and the challenge for acquisition