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:

Show in Google Earth or other KML viewer:

NorthAmericanMagneticMap.kml (uncompressed KML file 2k byte)

Show in your GIS using OGC web services:

https://mrdata.usgs.gov/wms/namag-1.1.1.xml (WMS, version 1.3.0)

https://mrdata.usgs.gov/services/wfs/magnetic (WFS, version 1.1.0)

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Select detailed aeromagnetic surveys by state or county

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)

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