Over the past 30 years Global Magnetic Anomaly Maps have been compiled utilizing POGO, MAGSAT and Oersted satellite magnetic field measurements. In spite of the fact that magnetic data was processed differently the Major Satellite Lithospheric Magnetic Anomalies appear to be the same suggesting that these anomalies are real.

Magnetic Fields originating in the crust of Earth calculated at the altitude 400 km (Purucker et al., 2002)

Earth's Magnetic Fields (400km)


Crustal Magnetic Model (Purucker et al., 1997)

A model of the magnetization of the earth's crust, based on measurements of the magnetic field made by NASA satellites Magsat, OGO-2, OGO-4, and OGO-6. This model was also designed to be consistent with other information on the magnetic properties of the earth's crust, such as the contrast in magnetic properties between oceanic and continental crust. Information on the thickness and temperature of the igneous crust is also included in this model. Warm colors (reds) indicate the strongest magnetizations while cool colors (blues) the weakest. Further information can be obtained by contacting Michael Purucker (purucker@geomag.gsfc.nasa.gov)>

Global Magnetization Map

Global Magnetization Map

Global Map of the CMP3 Lithospheric Contribution to Br at the altitude 400 km(Sabaka et al, 2000) Letters identify major satellite magnetic anomalies.

Lthospheric Satellite Magnetic Anomalies

Global Vertical Anomaly Map (Ravat et al., 1995)

The magnetic anomalies seen on this map are caused by regional variations in the bulk magnetic properties of the earth's crust. The observations were made by an Earth-orbiting satellite, Magsat, from late 1979 to mid 1980 at approximately 400 km altitude. The result of an extensive sequence of processing and isolation, these vertical intensity magnetic anomalies highlight many geologic features such as ancient shields, sedimentary basins and subduction zones. The magnetic anomalies are superimposed on topographic/bathymetric data (gray shading).

Global Vertical Anomaly Map

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