An aftershock measuring 5.4 on the Richter scale has rattled India's Andaman and Nicobar Islands, following the tsunami that is feared to have killed at least 7,000 people on the archipelago.
The New Delhi-based Indian Meteorological Department says about eight other aftershocks also hit the tropical island, all below magnitude 5.
The area is close to the epicentre of the magnitude 9 earthquake off Indonesia on Sunday that sent massive waves crashing across the Indian Ocean.
An aftershock of 6 was later recorded in the Andamans.
Witnesses say the sea tide has risen again in the cluster of islands, reviving fears among residents and tourists.
The Andamans lie 1200 kilometres from mainland India.