A RAPID APPROACH TO DEPTH DETERMINATION FROM MAGNETIC-ANOMALIES DUE TO SIMPLE GEOMETRICAL BODIES

The present paper deals with a rapid approach to depth determination o f a buried structure from magnetic anomalies. The problem of depth det ermination is transformed into the problem of finding the zero-anomaly distances from the observed magnetic anomalies. Formulas have been de rived for different components of the magnetic anomalies (vertical, ho rizontal, and total) due to long horizontal cylinders, thin dikes, and geologic contacts; and for vertical and horizontal components only of the magnetic anomalies due to spheres. Procedures are also formulated to estimate the amplitude coefficient (magnetic moment) and the index parameter (the effective angle of magnetization). The method was appl ied to synthetic data with and without random error and tested on a fi eld example from India.