Accession Number : AD0671864

Title :   ACOUSTIC PROVINCES OF THE NORTH PACIFIC BASED ON DEEP-SEA CORES. A PRELIMINARY SURVEY.

Descriptive Note : Technical rept.,

Corporate Author : LAMONT GEOLOGICAL OBSERVATORY PALISADES N Y

Personal Author(s) : Horn,David R. ; Horn,Barbara M. ; Delach,Marilyn N.

Report Date : DEC 1967

Pagination or Media Count : 67

Abstract : A preliminary survey of sub-bottom reflectors contained in 261 sediment cores from the North Pacific reveals that they are restricted to certain areas of the sea floor. Their distribution is given. Because they are of limited extent and possess different sonic properties, they are considered acoustic provinces. The sea floor of the North Pacific includes 3 such regions: (1) the Japan Acoustic Province, (2) the Aleutian-Alaska Acoustic Province and (3) the Central North Pacific Acoustic Province. Off Japan and the Kurils, sub-bottom reflectors are ash layers; south and west of the Aleutians and Alaska they are silts and sands deposited by turbidity currents; whereas in the central North Pacific reflectors are rare. Surficial sediment is only useful as an index to the reflectivity of the bottom within the Central North Pacific Acoustic Province. (Author)

Descriptors :   (*OCEAN BOTTOM, PACIFIC OCEAN), (*ACOUSTIC PROPERTIES, OCEAN BOTTOM), SEDIMENTATION, DISTRIBUTION, REFLECTIVITY, SAND, DEPOSITS, SILT, REFLECTORS, OCEAN CURRENTS, DEEP WATER, JAPAN, ALASKA, ALEUTIAN ISLANDS

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE