Abstract
A method and apparatus are described, which allow experimental interpretations of magnetic and gravimetric anomalies. The basic difference between this method and other experimental methods so far applied lies in the use of the direction in space of the magnetic lines of force as due to local structures, instead of the magnetic intensity, for interpretative purposes. This method gives due consideration to the inhomogeneous magnetization of structure and to the relation between the magnetization of a geologic structure and its direction of strike and geographical position. Based upon the relationship between magnetic forces and the second derivatives of the gravitational potential as given by Eoetvoes, the direction of the magnetic lines of force as due to local structures may be calculated from the data obtained with torsion‐balances. This procedure makes it possible to also interpret gravimetric anomalies by the experimental method under discussion. As an example for the practical application of this method the large magnetic anomaly at Grand Rapids, Michigan, has been interpreted in terms of structure.
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