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Each gravity measurement determines, at the station location, the sum of all effects from the grass roots down. A gravity map is almost never a simple picture of a single isolated disturbance but practically always is a combination of relatively sharp anomalies which must be of shallow origin, of anomalies with intermediate dimensions which may be those most probably indicative of geologically interesting sources and from very broad anomalies of a “regional” nature which have their origin far below that of the section within which the geological interest lies. Therefore, gravity interpretation frequently begins with some procedure which separates the anomalies of interest from superficial disturbances on one hand and the smooth, presumably deep “regional” effects on the other. The anomaly separation procedure may consist of the removal of a smooth regional by either of two methods; by an intuitive graphical method or by an analytical method in volving a numerical procedure applied to an array of values usually on a regular grid. The analytical process is basically a filtering process intended to emphasize or enhance certain components of the gravity field and suppress others.

The proponents of these two system have been termed “smoothers” and “gridders.” The “smoother” draws smooth curves on profiles or as contours on a map. These curves represent the component of the gravitational field which is to be removed. This “regional” is subtracted from the observed gravity map and the resulting “residual” contains

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