MAGNETIC ANOMALIES NORTH OF PUERTO RICO: TREND REMOVAL WITH ORTHOGONAL POLYNOMIALS,

Abstract

Magnetic total intensity data in the vicinity of the Puerto Rico trench and the outer ridge are presented. The magnetic field over the trench is unusually smooth and does not show the effect of local sources. A seventh-degree orthogonal polynomial was removed from along the survey lines to reduce the effects of both low-frequency magnetic time variations and the regional gradient of the main field of the earth. The residuals obtained in this way exhibit a predominant northwest-southeast trend, across the outer ridge and into the trench, which parallels the trend of the Bahama Islands. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1966
Accession Number
AD0477845

Entities

People

  • Gerald D. Van Voorhis
  • Thomas M. Davis

Organizations

  • Naval Oceanographic Office

Tags

DTIC Thesaurus Topics

  • Bahama Islands
  • Frequency
  • Intensity
  • Islands
  • Landforms
  • Magnetic Anomalies
  • Magnetic Fields
  • Polynomials
  • Puerto Rico
  • Residuals
  • Ridges

Readers

  • Approximation Theory.
  • Oceanography.