A statistical analysis of gravity data

Abstract

Gravity data is usually presented in the form of certain anomalies giving the differen-ce between observed values of gravity (after applying corrections to a certain extent) and the theoretical values. The sign of the ano-maly has been associated with the areas of excess or smallness of the particular correction used for that anomaly. However this asso-ciation is not always correct. Sometimes the computed correction is of the opposite sign to the one that is required. This fact is not clearly brought forth by the anomaly values as they stand. In order to study the relative importance of various types of iso-static corrections or to see if the earth's crust in a particular area is rigidly support-ing the topography, in fact for any statistical handling of the data, it is seen that the ratios of an anomaly to the next correction is more convenient.