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TitleMagnetic interpretation using the 3-D analytic signal
AuthorRoest, W R; Verhoef, J; Pilkington, M
SourceGeophysics vol. 57, no. 1, 1992 p. 116-125,
Alt SeriesGeological Survey of Canada, Contribution Series 54590
PublisherSociety of Exploration Geophysicists
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region; Ontario
NTS40O/01; 40O/08; 40O/09; 40O/16; 40O/07; 40O/10; 40O/15; 40P/05; 40P/12; 40P/13; 11K/NE; 11K/SE; 11N/SE; 11N/NE; 11J; 11O; 11I/SW; 11I/NW; 11P/SW; 11P/NW
AreaLake Huron; Cabot Strait
Lat/Long WENS -83.0000 -57.0000 48.0000 43.0000
Subjectsgeophysics; extraterrestrial geology; magnetic surveys; geophysical surveys; magnetic interpretations; magnetism; analytical methods; magnetic field; magnetic anomalies; geophysical interpretations; Sydney Basin
Illustrationscharts; block diagrams; formulae; plots
AbstractA new method for magnetic interpretation has been developed based on the generalization of the analytic signal concept to three dimensions. The absolute value of the analytic signal is defined as the square root of the squared sum of the vertical and the two horizontal derivatives of the magnetic field. This signal exhibits maxima over magnetization contrasts, independent of the ambient magnetic field and source magnetization directions. Locations of these maxima thus determine the outlines of magnetic sources. Under the assumption that the anomalies are caused by vertical contacts, the analytic signal is used to estimate depth using a simple amplitude half-width rule. Two examples are shown of the application of the method. In the first example, the analytic signal highlights a circular feature beneath Lake Huron that has been identified as a possible impact crater. The second example illustrates the continuation of terranes across the Cabot Strait between Cape Breton and Newfoundland in eastern Canada.

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