Improved magnetic anomalies of the Antarctic lithosphere from satellite and near-surface data

Kim, Hyung Rae; von Frese, Ralph R.B.; Taylor, Patrick T.; Golynsky, Alexander V.; Gaya-Piqué, Luis R.; Ferraccioli, Fausto. 2007 Improved magnetic anomalies of the Antarctic lithosphere from satellite and near-surface data. Geophysical Journal International, 171 (1). 119-126.

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The Antarctic magnetic anomaly map compiled marine and airborne surveys collected south of 60 degrees S through 1999 and used Magsat data to help fill in the regional gaps between the surveys. Orsted and CHAMP satellite magnetic observations with greatly improved measurement accuracies and temporal and spatial coverage of the Antarctic, have now supplanted the Magsat data. We combined the new satellite observations with the near-surface survey data for an improved magnetic anomaly map of the Antarctic lithosphere. Specifically, we separated the crustal from the core and external field components in the satellite data using crustal thickness variations estimated from the terrain and the satellite-derived free-air gravity observations. Regional gaps in the near-surface surveys were then filled with predictions from crustal magnetization models that jointly satisfied the near-surface and satellite crustal anomalies. Comparisons in some of the regional gaps that also considered newly acquired aeromagnetic data demonstrated the enhanced anomaly estimation capabilities of the predictions over those from conventional minimum curvature and spherical harmonic geomagnetic field models. We also noted that the growing number of regional and world magnetic survey compilations involve coverage gaps where these procedures can contribute effective near-surface crustal anomaly estimates.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Long-Term Monitoring and Survey – Geosciences Division
ISSN: 0956-540X
Additional Keywords: ADMAP, Antarctic magnetic anomalies, near-surface surveys, satellite surveys
NORA Subject Terms: Earth Sciences
Electronics, Engineering and Technology
Date made live: 27 Oct 2011 14:06 +0 (UTC)

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