Accession Number : AD0717407

Title :   Spectra of Geological Magnetic Fluctuations.

Descriptive Note : Final rept.,

Corporate Author : RAFF ASSOCIATES INC SILVER SPRING MD

Personal Author(s) : Bowen,Julius I. ; Sander,Eric L.

Report Date : 30 OCT 1970

Pagination or Media Count : 90

Abstract : The spectrum of geological noise, that portion of the magnetic field fluctuations which is due to buried deposits of magnetized rocks beneath the sea, has been studied. The power spectra along ten tracks off the U.S. East Coast, part of Project Magnet, were computed from the analog records of magnetic field measurements. An attempt was made to characterize the behavior of the observed spectra simply on the basis of Laplace's equation, the implication being that the spectral density (in logarithmic units) falls off linearly with frequency and the slope of the fall-off is directly proportional to the depth of magnetic deposits. The small data sample examined does in fact appear to be amenable to this analysis but the depth at which the magnetic rocks are buried beneath the ocean bottom must be treated as an adjustable parameter. This is theoretically reasonable there being no reason for this to be a global constant. Furthermore, this effective burial depth appears to apply over sizable geographical regions. (Author)

Descriptors :   (*GEOMAGNETISM, OCEAN BOTTOM), (*MAGNETIC ANOMALY DETECTION, POWER SPECTRA), BACKGROUND, NOISE, ROCK, DEPOSITS, INTEGRAL TRANSFORMS, MATHEMATICAL MODELS, AIRBORNE, MAGNETOMETERS, TABLES(DATA)

Subject Categories : Geomagnetism
      Magnetic & Electric Fld Detection & Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE