Abstract
Refraction surveys conducted by the Oil & Natural Gas Commission in the Cambay Basin, Gujarat, Rajahmundry area, Andhra Pradesh and near Rajamahal Traps, West Bengal, have indicated longitudinal velocities of the order of 4.2 to 5.8 km/sec for the Traps. Measurements of velocities by Sonic log in wells drilled for oil in the Cambay basin yielded values, ranging from 4.8 to 5.1 km/sec. While Sonic log velocities compare well with field refraction measurements, published values for trap basalt determined in the laboratories in India by various workers indicate a consistently high value of 6.6–7.2 km/sec.
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