The determination of physical properties of rocks and their relation to certain geological features, a problem on the borderland of Geology and Physics, has engaged the attention of some workers in the last few years. Pulse techniques have been extensively employed to measure the clastic wave velocities under ordinary pressure and temperature in a number of Indian rocks in the megacycle region. The velocity of compressional waves has been determined by measurement of travel time of pulses in specimens of rock. Most of the samples investigated, mainly normal Deccan Trap Basalts, furnished three specimens oriented at right angles to one another. In general these basalts are constituted of three essential minerals namely: plagioclase-felspar, pyroxene, and iron ore. The present paper gives a modal analysis, numerical tables of velocity as function of direction of propagation, initial density and porosity. The velocity values of longitudinal waves in these rocks are found to be in the region of 5.5 km/sec. This low value of velocity is presumably due to the vesicular nature of the trap and high porosity values. It has been noticed that in hard traps the velocity values are high, while in vesicular traps they are low, and they are dependent and closely connected with texture, porosity and mineralogical assemblage.