The Sumatra earthquake (Mw 9.3) of 26 December 2004 is one of the most important earthquakes from the point of view of plate tectonics. This event occurred along the plate boundary marked by the subduction zone between the Indian Plate and the Burmese Plate (a part of the Eurasian Plate). The subduction zone is characterized by N–S arcuate trench running parallel on the western side of the Sumatra and Andaman–Nicobar (A&N) Islands. Recent global tectonic plate reconstruction data suggest that the NE-moving Indian plate is obliquely converging with the Eurasian plate1 at 54 mm/yr. Also, the GPS observations2,3 between Bangalore and Port Blair (capital of A&N Islands) suggest that the Indian Plate is approaching the Burmese Plate at a rate of 15.3 mm/yr. Uplift and subsidence of A&N Islands along the western and eastern coast respectively, have been reported in literature during the Mw 7.9 1881 Car Nicobar earthquake3 .