Geophysics - Magnetics Ground

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Similarly to gravity survey, the magnetic survey method is also passive but involves the precise measurement of the Earth’s magnetic field.  Typically the total magnetic field and/or vertical magnetic gradient is measured.  Magnetism is, just like gravity, a potential field. Anomalies in the earth’s magnetic field are caused by induced or remanent magnetism. Induced magnetic anomalies are the result of secondary magnetization induced in a ferrous body by the earth’s magnetic field. The shape, dimensions, and amplitude of an induced magnetic anomaly is a function of the orientation, geometry, size, depth, and magnetic susceptibility of the body as well as the intensity and inclination of the earth’s magnetic field in the survey area.
 


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