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Over the ocean where gravity is measured from ships near sea level, there is no or little free-air correction. In marine gravity surveys, it was observed that the free-air anomaly is positive but very small over the Mid-Ocean Ridges in spite of the fact that these features rise several kilometers above the surrounding seafloor. [6]
For a measurement point above the reference ellipsoid, this means that the gravitational attraction of the bulk mass of the earth is slightly reduced. The free-air correction is simply 0.3086 mgal m −1 times the elevation above the reference ellipsoid. [11] The remaining gravity anomaly at this point in the reduction is called the free-air ...
Free-air gravity anomaly; G. G-force; Gal (unit) Geoid; ... Gravitational acceleration; Gravitometer; Gravity anomalies of Britain and Ireland; Gravity anomaly ...
Earth Gravity Field Anomalies, geoid format, NASA Earth Observatory Earth Geoid Field Anomaly globe, NASA Earth Observatory Mars free-air gravity map Venus gravity anomaly map. A gravity map is a map that depicts gravity measurements across an area of space, which are typically obtained via gravimetry. Gravity maps are an extension of the field ...
is the free-air gravity anomaly. δ g B {\displaystyle \delta g_{B}} is the Bouguer correction which allows for the gravitational attraction of rocks between the measurement point and sea level; δ g T {\displaystyle \delta g_{T}} is a terrain correction which allows for deviations of the surface from an infinite horizontal plane
Gravity is usually measured in units of acceleration.In the SI system of units, the standard unit of acceleration is metres per second squared (m/s 2).Other units include the cgs gal (sometimes known as a galileo, in either case with symbol Gal), which equals 1 centimetre per second squared, and the g (g n), equal to 9.80665 m/s 2.
The surface gravity field used in the Unified WGS Solution consisted of a set of 410 10° × 10° equal area mean free air gravity anomalies determined solely from terrestrial data. This gravity field includes mean anomaly values compiled directly from observed gravity data wherever the latter was available in sufficient quantity.
From Wikipedia, the free encyclopedia. Redirect page. Redirect to: Free-air gravity anomaly; Retrieved from " ...
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