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Measurement of gravitational and magnetic fields plays an important role in geophysical exploration. These potential fields can be mathematically transformed from the actual observation point to a fictitious observation point to enhance or reduce features in the data. For example, the effect of near-surface sources can be diminished by upward continuation of the observed values measured on the ground surface to a plane above the surface. On the other hand, if we want to enhance the effect of a shallow source, we perform downward continuation, which determines the fields at some depth below the surface.

In normal magnetic and...

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