Dictionary:Halo effect

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{{#category_index:H|halo effect}} 1. Many residual and second-derivative methods produce a ring or halo of an opposite sign around an anomaly, reflecting the opposite field curvature around the periphery of the anomaly. Halos do not represent separate anomalous masses, and they can be reduced or eliminated by biasing. 2. A ring anomaly, claimed to be characteristic of certain electromagnetic or geochemical effects of structures or hydrocarbon accumulations.