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Magnetic anomaly maps and data for North America

Airborne measurement of the earth's magnetic field over all of North America provides gridded data describing the magnetic anomaly caused by variations in earth materials and structure.

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Show in a web browser window:
reduced-size image of the interactive map reduced-size image of the interactive map reduced-size image of the interactive map reduced-size image of the interactive map
North America Detailed surveys Alaska surveys NURE surveys
Show in your GIS using OGC WMS:
http://mrdata.usgs.gov/wms/namag-1.1.1.xml
Show in Google Earth or another KML viewer:
NorthAmericanMagneticMap.kmz
Download:
Select detailed aeromagnetic surveys by state or county
Get the entire data set
ArcGIS grid format
Area Magnetic anomaly
Residual total intensity
Filtered anomaly
high-pass 500km
Residual using
satellite baseline
Size
North America NAmag_origmrg.zip NAmag_hp500.zip NAmag_CM.zip 316 MB
Continental US USmag_origmrg.zip USmag_hp500.zip USmag_CM.zip 46 MB
Geosoft grid format
Area Magnetic anomaly
Residual total intensity
Filtered anomaly
high-pass 500km
Residual using
satellite baseline
Size
North America NAmag_origmrg.grd
NAmag_origmrg.grd.gi
NAmag_hp500.grd
NAmag_hp500.grd.gi
NAmag_CM.grd
NAmag_CM.grd.gi
227 MB
Continental US USmag_origmrg.grd
USmag_origmrg.grd.gi
USmag_hp500.grd
USmag_hp500.grd.gi
USmag_CM.grd
USmag_CM.grd.gi
33 MB
(*.grd format is compatible with Oasis montaj viewer software)
Documentation:
Metadata:
[Outline] - [Questions & Answers] - [Plain text]
Publications:
USGS Open-File Report 2002-414
Digital data grids for the magnetic anomaly map of North America
Airborne measurement of the earth's magnetic field over all of North America provides gridded data describing the magnetic anomaly caused by variations in earth materials and structure.
http://pubs.usgs.gov/of/2002/ofr-02-414/
USGS Open-File Report 2002-361
Digital Aeromagnetic Datasets for the Conterminous United States and Hawaii - A Companion to the North American Magnetic Anomaly Map
Digital and analog archives comprising more than 1,000 surveys, covering approximately 8,000,000 line-km of data, flown at various flight heights and line spacings.
http://pubs.usgs.gov/of/2002/ofr-02-361/
USGS Open-File Report 2009-1129
Aeromagnetic and aeroradiometric data for the conterminous United States and Alaska from the National Uranium Resource Evaluation (NURE) program of the U.S. Department of Energy
Flight-line data from the original surveys available for each 1°x2° map quadrangle, used in creating the national compilation
http://pubs.usgs.gov/of/2009/1129/
Mineral Resources Eastern Central Western Alaska Minerals Information
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Page Last Modified: Friday, 07-Mar-2014 15:35:28 MST