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Upper-level and near-bottom current measurements were made near Deep Sea Drilling Project Hole 395A (22°45 'N, 46°05'W) in March and April 1981 in support of the at-sea test of the Marine Seismic System Project. Four upperocean current profiles were made during initial deployment of the borehole seismometer. Readings were noticeably contaminated by ship motion, but indicated a variable yet generally slow current regime that posed minimal threat of cable entanglement. Current measurements made 5 m off bottom during seismometer testing showed marked spectral peaks at semidiurnal and inertial frequencies. Mean speed of 4.4 cm/s and maximum speed of 9 cm/s were low but possibly of sufficient magnitude to cause contamination of concurrently deployed ocean bottom seismometer (OBS) records by hydrodynamically generated noise. Other studies have suggested noise contamination of OBS records by near-bottom currents, with a possible 10 cm/s threshold for its importance. Although methods to detect and eliminate the noise might be developed, instrument testing and redesign to reduce sensitivity to contamination is probably more feasible.

Currents near Deep Sea Drilling Project Hole 395A and Effects on Components of the Marine Seismic System Project