Abstract
Epicentre and origin time of the Great Assam earthquake of 15 August 1950 and 54 other earthquakes shocks which occurred in the Assam region upto the end of Apri11951 have been determined by the Least Square method. Magnitudes of these shocks have also been estimated from data of Indian stations. Using data of near stations at Tocklai, Tezpore, Shillong (specially opened for this study) and of Calcutta and Chatra, the velocities of seismic waves in Assam have been calculated within narrow 1imits of error and estimates of depth of crustal lyers.have been obtained. Travel times of seismic waves in Assam and neigbourhood have been compared with the travel time tables of Jeffreys and Bullen (1940).
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