Compatibility of high-altitude aeromagnetic and satellite-altitude magnetic anomalies over Canada

D. Ravat, K. A. Whaler, M. Pilkington, T. Sabaka, M. Purucker

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


Results from equivalent-source distributions derived jointly from high-altitude (average 4 km) aeromagnetic and Magsat-derived (average 400 km) magnetic anomalies over Canada indicate that long-wavelength components (500-2500 km) in these fields are extremely compatible with one another (with a correlation coefficient of 0.95). The jointly estimated anomaly field at the earth's surface can be used as a long-wavelength adjustment surface for regional near-surface magnetic anomaly compilations and in assessing the performance of other downward-continuation techniques. Because near-surface anomalies are not available over all regions of the world, we compare the jointly estimated anomaly field to the results of two different downward-continuation techniques: the evaluation of anomalies at the earth's surface from spherical harmonic coefficients derived from satellite-altitude data and the use of downward-continuation methods based on harmonic splines. Numerical and visual comparisons of these downward-continued fields with the jointly estimated anomaly field from the equivalent-source method indicate they are well correlated and could provide a useful method of deriving long-wavelength leveling surfaces for regional and worldwide magnetic anomaly maps.

Original languageEnglish
Pages (from-to)546-554
Number of pages9
Issue number2
StatePublished - Mar 2002

ASJC Scopus subject areas

  • Geochemistry and Petrology


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