Abstract
Based on the decay characteristics, a total of 344 AEM-INPUT anomalies recorded in a multiparameter airborne geophysical survey over a part of Jhansi district (U.P.) India is studied and classified as good (38), medium (82) and poor (224). The parameters used for this purpose are: (1) time parameter (τ), (2) slope of the decay curve; and (3) channel amplitude ratio ( C4 C2 ). An approximate estimate of conductivity—thickness product ( σt) is made from the time parameter (τ). The plots of σt versus the rate of decay and channel amplitude ratio ( C4 C2 ) exhibit an approximate linear relationship. The σt map prepared from the estimate of this quantity for individual anomalies shows a good correlation with the airborne magnetic map and the local geology of the area. The coincidence of most of the poor anomalies with the exposures of conducting shales or other surface conductors supports the classification procedure employed and their use in the interpretation of AEM anomalies.
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