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.

View:

Show in a web browser window:


North America	Detailed surveys	Alaska surveys	NURE surveys

Show in your GIS using OGC WMS:

http://mrdata.usgs.gov/wms/aeromag-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
Spatial Data Crustal Geophysics and Geochemistry Other Mineral Related Links