magnetic anomaly

noun Geology.
a departure from the normal magnetic field of the earth.

Origin:
1895–1900

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Defines magnetic anomaly, induced and remanent magnetism in rocks, and describes magnetic anomaly maps.
Geophysical signature: elongate positive magnetic anomaly.
Magnetic susceptibility is the physical property that determines how much induced magnetic anomaly a body of rock will produce.
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