Accession Number : AD0428987

Title :   SOFAR VELOCITIES IN THE NORTH PACIFIC,

Corporate Author : HAWAII INST OF GEOPHYSICS HONOLULU

Personal Author(s) : Johnson, Rockne H.

Report Date : NOV 1963

Pagination or Media Count : 16

Abstract : Average velocities of propagation in the deepocean sound (SOFAR) channel have been measured from hydrophone recordings of the Pacific Missile Range for explosive sources near the Aleutian Islands. Hydrophone sites were near Oahu, Midway, Wake, and Eniwetok Islands. Means of at least five velocity computations were obtained from sound-channel paths to each site and from sources in deep water south of Adak. The mean values range from 1.477 to 1.478 km/sec. The velocity to hydrophones located on the ocean floor at a depth of 5500 meters near Wake was also measured. The mean velocity obtained, 1.479 km/sec, is slightly faster than that for the sound-channel hydrophones at Wake. Shots located north of the Aleutian Islands showed lower average transmission velocities (1.431 to 1.473 km/sec) than the other shots. This is interpreted as indicating deviations from the great-circle path in crossing the Aleutian ridge. (Author)

Descriptors :   (*HYDROGRAPHIC SONAR, OCEAN BOTTOM), (*UNDERWATER SOUND, VELOCITY), SONAR, SOUND TRANSMISSION, VELOCITY, HYDROPHONES, DEPTH FINDING, EXPLOSIONS, UNDERWATER SOUND SIGNALS, SONAR EQUIPMENT, UNDERWATER SOUND GENERATORS, PROPAGATION, MEASUREMENT, EARTHQUAKES, BOMBS, SOUND RANGING, POSITION FINDING.

Distribution Statement : APPROVED FOR PUBLIC RELEASE