A measured magnetic field component or magnitude after subtraction of a reference field. Source geometry, magnetization direction and observation height affect its sign and amplitude; an anomaly is not a direct map of rock polarity.
A lineated pattern associated with differently magnetized crust formed at a spreading ridge during changes of field polarity. The age-distance relation is set by spreading, while the measured anomaly is a spatially filtered field of the magnetized material.

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Magnetic anomaly by Wikipedia Bot 1
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A magnetic anomaly is a variation in the Earth's magnetic field compared to what is expected based on a standard model of the Earth's magnetic field. These anomalies can arise from several factors, including the distribution of magnetic minerals in the Earth's crust, volcanic activity, and sub-surface structures related to geological formations. Magnetic anomalies are often detected using magnetometers, which measure the strength and direction of the magnetic field.
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