| Title | Magnetic interpretation using the 3-D analytic signal |
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| Author | Roest, W R; Verhoef, J; Pilkington, M |
| Source | Geophysics vol. 57, no. 1, 1992 p. 116-125, https://doi.org/10.1190/1.1443174 |
| Year | 1992 |
| Alt Series | Geological Survey of Canada, Contribution Series 54590 |
| Publisher | Society of Exploration Geophysicists |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Eastern offshore region; Ontario |
| NTS | 40O/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 |
| Area | Lake Huron; Cabot Strait |
| Lat/Long WENS | -83.0000 -57.0000 48.0000 43.0000 |
| Subjects | geophysics; extraterrestrial geology; magnetic surveys; geophysical surveys; magnetic interpretations; magnetism; analytical methods; magnetic field; magnetic anomalies; geophysical interpretations;
Sydney Basin |
| Illustrations | charts; block diagrams; formulae; plots |
| Released | 1992 01 01 |
| Abstract | A 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. |
| GEOSCAN ID | 132732 |
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