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In geodesy and geophysics, the Bouguer anomaly (named after Pierre Bouguer) is a gravity anomaly, corrected for the height at which it is measured and the attraction of terrain. The height correction alone gives a free-air gravity anomaly. ==Anomaly== The Bouguer anomaly is related to the observed gravity as follows: : : 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 correction for terrain called the ''Bouguer reduction''; * is the free-air gravity anomaly. 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 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bouguer anomaly」の詳細全文を読む スポンサード リンク
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