free-air correction | Energy Glossary

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free-air correction

1. n. [Geophysics]

In gravity surveying, a correction of 0.3086 mGal/m [0.09406 mGal/ft] added to a measurement to compensate for the change in the gravitational field with height above sea level, assuming there is only air between the measurement station and sea level.

See: anomalyelevation correctiongravity anomalygravity surveysurvey