Q. Which country was the epicentre of the deadly "2004 Indian Ocean earthquake and tsunami"?
Answer: Indonesia
Notes: Indonesia was the epicentre of the deadly "2004 Indian Ocean earthquake and tsunami". The 2004 Indian Ocean earthquake and tsunami, also known as the Boxing Day Tsunami or the Sumatra–Andaman earthquake, occurred on 26 December, with an epicentre off the west coast of northern Sumatra, Indonesia. It was an undersea megathrust earthquake that registered a magnitude of 9.1–9.3 Mw, reaching a Mercalli intensity up to IX in certain areas. The earthquake was caused by a rupture along the fault between the Burma Plate and the Indian Plate.