Corrections to gravity data and the meaning of the term Bouguer anomaly still confuse many of us despite detailed discussions by such gravity practitioners as LaFehr (1991, 1998), Chapin (1996), and Talwani (1998). In his 1991 article, LaFehr pointed out that incomplete treatment of the subject by major exploration geophysics textbooks is a main reason for the misunderstanding of gravity data reductions. While the mathematical expression for absolute Bouguer anomaly is explicit and available in correct form in some textbooks, that is not true in the case of the relative Bouguer anomaly. The formula for relative Bouguer anomaly seems in...

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