On 14 September 2002, at 03:58:31 AM a ML 6.0 (IMD) Mw 6.5 (USGS) earthquake struck the Northern Andaman Island region of the Andaman & Nicobar Islands (Union Territory) of India. The epicenter is about 165 km NNE from Port Blair, the administrative head quarters of A&N Islands, in the sea about 24 km SSE of Diglipur, a town with a population of about 30,000. The location of the epicenter is 13.013^oN 93.147^oE (USGS), and the focal depth is 33 km. The main shock was followed by many after shocks, the largest of them being M 5.3 on 14 September at 04:44 hours and M5.2 on 15 September at 01:29 hours. In the two days following the main shock, 20 after shocks of M>3 were recorded at IMD Observatory in Port Blair; a list of these is given in Table 1. Aftershock activities were noted even till 24 September 2002.