Indonesia has issued a tsunami warning after a powerful earthquake struck of the coast of Sumatra.
The warning is for West Sumatra, North Sumatra and Aceh after a powerful and shallow earthquake of magnitude 7.9 struck off the west coast of the Indonesian island of Sumatra on Wednesday, the National Meteorolgical Agency said.
USGS originally put the magnitude at 8.2, and then 8.1, before lowering it to 7.9.
Indonesia, especially Aceh, was badly hit by the Indian Ocean tsunami in 2004.
The country straddles the so-called "Pacific Ring of Fire", a highly seismically active zone, where different plates on the earth's crust meet and create a large number of earthquakes and volcanoes.
A powerful earthquake, with a magnitude of 6.6, jolted western Indonesia early today, killing a man and sending panicked residents fleeing from their homes across Sumatra island's northern tip.
Sutopo Purwo Nugroho from the National Disaster Management Agency said a 70-year-old man who was suffering from hypertension died as he fled in panic and fell, but there were no other casualties reported and no reports of damage.
A strong earthquake with a magnitude of 6.6 has struck off northern Sumatra in Indonesia, the US Geological Survey has said, and there were warnings that a local tsunami was possible.
The Hawaii-based Pacific Tsunami Warning Center said there was no threat of a widespread, destructive tsunami after the quake but said there was a "very small possibility" of a local tsunami.