Abstract
An estimate of the extent and thickness of the Deccan Trap in India has been made and charts have been drawn showing the geological effect on gravity due to the excess density of the Trap. These results have been used to examine the situation near Bombay. It is found that the superficial trap flows do not explain the high gravity at Bombay, nor the gravity gradient of about 4 mgals./mile to the east, nor the seaward deflection of the plumb-line. The effects of a hypothetical fissure, extending for more than 100 kilometres northward from a point about 25 miles south of Bombay, have been computed for two assumed density distributions within the fissure. These computations show that the fissure, 30 kilometres deep, cannot be less than 5 kilometres wide.
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