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Magnetic surveys are a geophysical method to image anomalies in the earth’s magnetic field within the sub-surface. Oil and gas exploration use magnetic anomalies to detect faults and igneous intrusions. Magnetics is commonly used with gravity Gravity methods as a low cost way to understand the structure of the subsurface during the beginning phases of exploration. Both gravity and magnetics are potential fields meaning that they are the spatial derivatives of their respected fields (Blakely, 1996). Gravity and magnetics are also low resolution and non -unique meaning that multiple geologic models can fit the data (Blakely, 1996). The more that is known about the sub-surface, the more the geologic model can be narrowed down. Other uses of magnetics include detecting pipes, buried objects, and archeological sites.