Dictionary:Gravity survey

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Measurements of the gravitational field at various locations over an area of interest. The objective in exploration work is to associate variations with differences in the distribution of densities and hence of rock types. Occasionally the whole gravitational field is measured (as with a pendulum) or derivatives of the gravitational field (as with a torsion balance), but usually the difference between the gravity field at two points is measured (as with a gravimeter q.v.). Gravity data usually are displayed as Bouguer or free-air anomaly maps.