The Bouguer correction is made, as a rule, to sea level and by using an average density value of the rocks, determined by the profile method. However, if the density of the rocks forming the topography varies from place to place, then the proper density value should be used for every topographical feature.The Bouguer correction with varying density should be made only to a surface drawn through the low points of the topography. Below this surface, and to sea level, a constant density value should be used all over in the area; otherwise, nonexisting gravity anomalies may be introduced into the results of the survey, or existing gravity anomalies may be distorted.A few examples are given for computing Bouguer corrections with varying surface density, and to illustrate the errors introduced by using improper density values.

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