Bouguer Anomaly - Anomaly

Anomaly

The Bouguer anomaly is related to the observed gravity as follows:

Here, is the Bouguer anomaly, is the free-air gravity anomaly, is the correction for latitude (because the Earth is not a perfect sphere) and is the free-air correction and is the correction for terrain called the Bouguer reduction.

A Bouguer reduction is called simple or incomplete if the terrain is approximated by an infinite flat plate called the Bouguer plate. refined or complete Bouguer reduction removes the effects of terrain precisely. The difference between the two, the differential gravitational effect of the unevenness of the terrain, is called the terrain effect. It is always negative.