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Magnetic anomaly


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A *magnetic anomaly* (geophysics ) is a local variation in the Earth's
magnetic field resulting from variations in the chemistry or magnetism of
the rocks. Mapping of variation over an area is valuable in detecting
structures obscured by overlying material. The magnetic variation in
successive bands of ocean floor parallel with mid-ocean ridges is
important evidence supporting the theory of seafloor spreading , central
to plate tectonics .

[edit ] See also

* Aeromagnetic survey 
* Earth's magnetic field 
* Kursk Magnetic Anomaly 
* Magnetometer 
* Temagami Magnetic Anomaly