Accession Number : AD0696997

Title :   STUDIES IN MARINE GEOPHYSICS AND UNDERWATER SOUND FROM DRIFTING ICE STATIONS

Descriptive Note : Final rept.

Corporate Author : LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY

Personal Author(s) : Hunkins, Kenneth L ; Kutschale, Henry W ; Hall, John K

PDF Url : AD0696997

Report Date : Sep 1969

Pagination or Media Count : 109

Abstract : The detailed drift of T-3 from May 1962 to June 1969 is plotted from over 9000 celestial and satellite fixes processed entirely by digital computer. Over 14,000 km of precision depth profiles show detailed topography of parts of the Northwind Ridge, Chuckchi Rise, Mendeleyev Ridge, Alpha Cordillera, Wrangel Plain, Canada Plain, and Chuckchi Plain. Over 4,500 km of continuous seismic reflection profile show sediment thicknesses of about 1 km on the ridges to more than 3.5 km under Wrangel Plain. Over 49,000 magnetic and 10,000 gravity measurements have helped to delineate regional geologic structure and crustal movements. The sound scattering layer in the Arctic was discovered on precision depth recordings. Long-range sound propagation in the Arctic SOFAR channel is described by ray and normal mode theory. The normal mode treatment for the channel bounded above by a rough ice sheet is in remarkably good agreement with acoustic signatures from distant explosions. The Ekman current spiral was verified. This is the first quantitative verification of Ekman's theory in any deep ocean. The first observations of seismic noise on the Arctic Ocean floor were made aboard ice island ARLIS II.

Descriptors :   *ARCTIC OCEAN, *ICE ISLANDS, *MARINE GEOPHYSICS, *UNDERWATER SOUND, DATA PROCESSING, DRIFT, ECHO RANGING, METEOROLOGICAL SATELLITES, OCEAN CURRENTS, OCEAN WAVES, REFLECTION, SCATTERING, SEDIMENTATION, SOUND TRANSMISSION, STRUCTURAL GEOLOGY, THICKNESS

Subject Categories : Seismology
      Snow, Ice and Permafrost
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE