Open AccessSpectral Analysis of Magnetic Surveys
Author(s) -
Gudmundsson G.
Publication year - 1967
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1967.tb02163.x
Subject(s) - magnetization , magnetic anomaly , spectral line , scalar (mathematics) , ridge , geology , geophysics , physics , magnetic field , mathematics , geometry , paleontology , quantum mechanics , astronomy
Summary A general relation between magnetization and the spectrum of magnetic anomalies is proved under the assumption that the magnetization is a product of a scalar function and a constant vector. It can be used to find spectra of models and compare these with actual values in order to test hypotheses about formation of the rocks and spatial distribution of magnetization. The method is suitable for examining some of the problems of distinguishing between different hypotheses. Two‐dimensional spectra and cross‐spectra of a survey from the Carlsberg Ridge confirm previous results that the anomalies cannot be explained by a uniformly magnetized topography. The spectra provide a good separation of high‐frequency anomalies associated with topography from the larger effect of magnetized blocks which is mainly confined to lower frequencies. Estimates of magnetization from different parts of the spectrum show that its strength in the uppermost part of the oceanic floor is considerably larger than the average value for the blocks.