SPECTRAL ANALYSIS OF GEOLOGICAL MAGNETIC SIGNALS

Authors
  1. Wilson, H.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
The report derives the power spectrum of the signal from a magnetometer or a gradiometer moving in a straight line at a constant speed over a statistically stationary distribution of magnetic dipoles. (The most common example of such a distribution is magnetized rock.) The expressions for the power spectra presented here are related directly to the autocorrelation function for the magnetization density of the source distribution. The formulation presented here shows how to take into account the effect on the magnetic field of long-range correlations in source magnetization. Following the deduction of the connection between the magnetic sources and the power spectra, the mathematical procedures described in the report are applied to two examples of magnetic sources to show the results to be expected and to illustrate the problems that will be encountered in performing the calculations.
Report Number
DREP-TM-88-19 — Technical Memorandum
Date of publication
15 Oct 1988
Number of Pages
39
DSTKIM No
89-00488
CANDIS No
58428
Format(s):
Hardcopy;Originator's fiche received by DSIS

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