FINE-SCALE TOPOGRAPHY AND MAGNETIC ANOMALIES OF THE DEEP SEA FLOOR OFF SOUTHERN CALIFORNIA.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 03, 1968
- Accession Number
- AD0667712
Entities
People
- Michael S. Loughridge
Organizations
- Scripps Institution of Oceanography