Bouguer anomaly

Also found in: Wikipedia.
Related to Bouguer anomaly: free air anomaly, Free air correction

Bou·guer anomaly

The difference between the expected value of gravity at a given location and its actual value. Bouguer anomalies take into account factors such as latitude, longitude, altitude, and the rotation of the earth and are often seen as evidence of local variations in the density of the earth.

[After Pierre Bouguer (1698-1758), French hydrographer and physicist.]
References in periodicals archive ?
Ground gravity surveys conducted for Fortune in 1995 and 1996 also identified a coincident Bouguer anomaly with peak amplitude of 2 milligals (mGal).
Although reduced in magnitude (compared to the initial gravity value itself), the free-air and Bouguer anomaly fields can still be rough and correlated with height.
The data is processed to remove undesirable influences from the surroundings in order to isolate Bouguer anomaly (BA).
The data from the Czech Republic, Slovakia, Hungary, Romania and Western Ukraine were probably developed in a consistent manner that is based on the Bouguer anomaly map, which assumes the density of the Earth's crust is equal to 2.67 g/[cm.sup.3].
The most significant anomaly occurs along the Nicoya Peninsula, where Bouguer anomaly values reach up to 120 x [10.sup.-5] m/[s.sup.2].
Complete Bouguer anomaly data were interpolated to a regular grid of 5 km to avoid artifacts yielded by the irregular distribution of data.
The gravity values, as well as the complete Bouguer anomaly (CBOG) for each gravity station, were computed utilizing raw gravimeter readings on a portable computer.
The Bouguer Anomaly. Bouguer anomaly is computed using
Free-air anomaly maps and total Bouguer anomaly maps are presented for the Caribbean region, obtained from the gravimetric compilation published by the Scripps Institution of Oceanography, University of California, San Diego.
Thematic gravity and magnetic maps were processed by Geosoft Oasis Montaj (Reeves, 1991; 2005) including Bouguer anomaly and reduced to the pole magnetic anomaly maps and their corresponding residual components.
The different regional components were identified, based on a qualitative analysis from the Bouguer anomaly (Fig.
The Bouguer anomaly was calculated by employing a vertical gradient of the gravity of 0,3086 mGal/m (Swick, 1942) and a density of 2, 67 kg/[m.sup.3] for crustal lithologies.