free-air gravity anomaly


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free-air gravity anomaly

[′frē ‚er ′grav·əd·ē ə‚näm·ə·lē]
(geophysics)
A measure of the mass excesses and deficiencies within the earth; calculated as the difference between the measured gravity and the theoretical gravity at sea level and a free-air coefficient determined by the elevation of the measuring station. Also known as free-air anomaly.
References in periodicals archive ?
A combined satellite and airborne gravity and magnetic study were carried out over the 50 km wide structure (Hernandez et al., 2009).As a result, a prominent positive free-air gravity anomaly mapped over a roughly 50-km diameter basin is consistent with a mascon centered on (4[degrees]30'N, -69[degrees]15'W) in the Vichada Department.
In total, approximately 1,000,000 points were measured with mean error of free-air gravity anomaly no greater than [+ or -] 0.5 [micro][ms.sup.-2] (Krolikowski, 1994).