Bouguer anomaly

Bouguer anomaly

In geodesy and geophysics, the Bouguer anomaly (named after Pierre Bouguer) is computed from a free-air anomaly by computationally removing from it the attraction of the terrain, the "Bouguer reduction".

In case where the effects of terrain are removed precisely, we speak of a "refined" or "complete" Bouguer reduction. In case the terrain is approximated by a flat plate of thickness H, the height of the gravity measurement location above sea level, we speak of a "simple" Bouguer reduction. The difference between the two, the differential gravitational effect of the unevenness of the terrain, is called the terrain effect. It is always negative.

The equation for the simple Bouguer reduction is δG_f = 2Hρπγ, where H is the thickness of the plate, γ is the constant of gravitation and ρ is the density of the material.

External links

* [http://www.astro.oma.be/D1/GRAVIMETRY/gravboug.html Bouguer anomalies of Belgium. The blue regions are related to deficit masses in the subsurface]

See also

* Gravity anomaly
* Physical geodesy
* Vertical deflection


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