Accession Number : AD0817251

Title :   OCEANOGRAPHIC CRUISE SUMMARY RECONNAISSANCE SURVEY OF NORTHERN MID-OCEANIC RIDGE.

Descriptive Note : Informal rept. 30 Jul-10 Oct 66,

Corporate Author : NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS

Personal Author(s) : Johnson, G. Leonard

Report Date : JUL 1967

Pagination or Media Count : 7

Abstract : A joint U.S. Naval Oceanographic Office and U.S. Coast Guard geological, geophysical survey was conducted during the summer months of 1966 on that portion of the mid-oceanic ridge that lies north of Iceland. Preliminary analysis of the data delineates the general form, magnetic signature, and size of the mid-oceanic ridge and several small related fracture zones. It was found that the mid-oceanic ridge between Iceland and Jan Mayen has an average width of about 60 miles and a poorly developed rift valley. East of Jan Mayen, the mid-oceanic ridge is well developed with a rift valley and flank provinces. It had been previously thought that the Jan Mayen Fracture Zone struck east-west in the region east of 5 degrees W. and 71 degrees N. Instead, it was found to be an en echelon feature striking northwest-southeast. This fracture zone extends from the base of the Greenland continental slope to the Norwegian coast. (Author)

Descriptors :   (*OCEAN BOTTOM TOPOGRAPHY, ATLANTIC OCEAN), MARINE GEOPHYSICS, OCEANOGRAPHIC DATA, GEOMAGNETISM, BATHYTHERMOGRAPH DATA, OCEANOGRAPHIC SHIPS, DEEP WATER, MAPS.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE