In this paper, some examples of the influence of the remanent magnetism of rocks on magnetic fields are presented. In the study, a series of dikes were investigated since, in this case, the geometry is simple and the fields can be calculated with some precision. A large number of samples were collected and the remanent magnetization and susceptibility measured. Using this information the expected curves for ground vertical component magnetic profiles and airborne magnetic profiles were computed. These were then compared with the actual observed profiles. A good correlation was found when both remanent and induced magnetization were considered. In determining the remanent magnetization intensity, samples that had unusually high Q values were rejected because these probably represented local effects due to lightning strikes. In addition, the mean value of the magnetization was determined by taking into account the scatter of directions of the measured NRM's. The agreement between observed and computed data was good.
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D. W. Strangway (1965) studied this question.