The 2004 Indian Ocean earthquake occurred at 00:58:53 UTC on 26 December, with an epicentre off the west coast of Sumatra, Indonesia, a moment magnitude of 9.1–9.3 and a maximum Mercalli intensity of IX (Violent). It was an undersea megathrust earthquake caused by rupture along the fault between the Burma Plate and the subducting Indian Plate. The 2004 Indian Ocean earthquake triggered a series of devastating tsunamis up to 30 metres (100 ft) high, inundating coastal communities along the coasts of the Indian Ocean and killing an estimated 227,898 people in 14 countries. The earthquake was one of the deadliest natural disasters in recorded history, the deadliest of the 21st century so far. Indonesia was the hardest-hit country, followed by Sri Lanka, India, and Thailand.