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... > Science Keywords > EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC ANOMALIES

Preferred term

MAGNETIC ANOMALIES  

Definition

  • 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. (en)

Broader concept

Change note

  • 2013-02-18 09:57:23.0 [tbs1979] Move Concepts delete broader relation (null); add broader relation (MAGNETIC ANOMALIES [65ae8ab2-489b-44bf-bf5b-43cf957b70c0,63569] - MAGNETIC FIELD [204b482b-449b-42c9-a5bb-f6da42bee3a4,63915]);
  • 2013-03-11 15:06:32.0 [tbs1979] update Definition (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.); update Definition (U.S. Geological Survey);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/65ae8ab2-489b-44bf-bf5b-43cf957b70c0

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