Underwater Sound Signals Received on Geophones and Hydrophones off San Diego, California

Low-frequency underwater sound signals from CW and explosive sources were received on both three-component geophones and hydrophones buried in the sediment offshore of Mission Beach, California, and recordings made. Analysis reveals that the N-S geophones provide a better S/N ratio for the shallow water (< 200 m) area west of the NOSC oceanographic tower, but that the hydrophones are better for deep-water shots in the San Diego Trough, over Thirty-Mile Bank, and in the San Clemente Basin west of Thirty-Mile Bank.