Anomaly The Bouguer anomaly is related to the observed gravity asfollows : Here, is the Bouguer anomaly; is the observed gravity; is the correction for latitude (because the Earth is not a perfect sphere); is the free-air correction; is the Bouguer correction which allows for the gravitational attraction of rocks between the measurement point and sea level; is the free-air gravity anomaly. is a terrain correction which allows for deviations of the surface from an infinite horizontal plane   Reduction A Bouguer reduction is called simple (or incomplete) if the terrain is approximated by an infinite flat plate called the Bouguer plate. A refined (or complete) Bouguer reduction removes the effects of terrain more precisely. The difference between the two is called the terrain effect (or terrain correction) and is due to the differential gravitational effect of the unevenness of the terrain; it is always negative. More generally, for a mass distribution with the density depending on one Cartesian coordinate z only, gravity for any z is 2πG times the difference in mass per unit area on either side of this z '' value. A combination of two parallel infinite if equal mass per unit area plates does not produce any gravity between them.
Definition The Bouguer anomaly defined as : Here, is the free-air gravity anomaly. is the Bouguer correction which allows for the gravitational attraction of rocks between the measurement point and sea level; is a terrain correction which allows for deviations of the surface from an infinite horizontal plane The free-air anomaly , in its turn, is related to the observed gravity as follows: where: is the correction for latitude (because the Earth is not a perfect sphere; see normal gravity); is the free-air correction. Reduction A Bouguer reduction is called simple (or incomplete) if the terrain is approximated by an infinite flat plate called the Bouguer plate. A refined (or complete) Bouguer reduction removes the effects of terrain more precisely. The difference between the two is called the terrain effect (or terrain correction) and is due to the differential gravitational effect of the unevenness of the terrain; it is always negative. More generally, for a mass distribution with the density depending on one Cartesian coordinate z only, gravity for any z is 2πG times the difference in mass per unit area on either side of this z value. A combination of two parallel infinite if equal mass per unit area plates does not produce any gravity between them.
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Anomaly
Definition
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is related to the observed gravity asfollows
defined as
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Bouguer anomaly; is the observed gravity; is the correction for latitude (because the Earth is not a perfect sphere); is the
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correction; is the
gravity anomaly. is the
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the free-air gravity anomaly. is
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The free-air anomaly , in its turn, is related to the observed gravity as follows:
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where: is the correction for latitude (because the Earth is not a perfect sphere; see normal gravity); is the free-air correction.
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