Accession Number : AD0667712

Title :   FINE-SCALE TOPOGRAPHY AND MAGNETIC ANOMALIES OF THE DEEP SEA FLOOR OFF SOUTHERN CALIFORNIA.

Descriptive Note : Summary rept.,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF MARINE PHYSICAL LAB

Personal Author(s) : Loughridge,Michael S.

Report Date : 03 JAN 1968

Pagination or Media Count : 67

Abstract : The first survey of a portion of the Pacific sea floor by means of deeply towed instruments was made in July 1965. The area surveyed off California near 123 deg 10 min W and 32 deg 40 min N was previously thought to be one of typical abyssal hills at a depth of approximately 4000 meters. Observations of the fine-scale topography and total magnetic field intensity were made with a narrow-beam echo-sounder and proton magnetometer towed within 300-500 meters of the sea floor. These observations show that the topography exhibits a linear trend in a direction which parallels the well-known Mason-Raff magnetic trends. In a direction perpendicular to this trend, the topography has a gently undulatory character with a recurrence wavelength of approximately 0.4 sq km and relief of approximately 100 meters. Speculative interpretations of the topography and magnetics are given which discuss their origin, preservation, and possible relationships to other crustal features. Instrumentation and acoustic navigation techniques are also described. (Author)

Descriptors :   (*OCEAN BOTTOM TOPOGRAPHY, CALIFORNIA), (*MAGNETIC FIELDS, ANOMALIES), ECHO RANGING, MAGNETOMETERS, DEEP WATER, OCEAN BOTTOM, INTENSITY, MATHEMATICAL ANALYSIS, SOURCES, UNDERWATER SOUND, POWER SPECTRA, MAPS, REFLECTION, NAVIGATION CHARTS, BATHYTHERMOGRAPH DATA, PACIFIC OCEAN

Subject Categories : Physical and Dynamic Oceanography
      Geomagnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE