TECHNIQUES FOR INTERPRETATION OF GEOID ANOMALIES

For purposes of geological interpretation, techniques are developed to compute directly the geoid anomaly over models of density within the earth. Ideal bodies such as line segments, vertical sheets, and rectangles are first used to calculate the geoid anomaly. Realistic bodies are modeled with formulas for 2-dimensional polygons and 3-dimensional polyhedra. By using Fourier transform methods the 2-dimensional geoid is seen to be a filtered version of the gravity field, in which the long-wavelength components are magnified and the short wavelength components diminished.-Author