Indonesia, India and Thailand have downgraded tsunami alerts that had been issued following powerful earthquakes off the coast of Indonesia's Aceh province, prompting evacuations from coastal regions.
Wednesday's first quake was measured at a magnitude of 8.6, according to the US Geological Survey, which revised down an earlier 8.9 estimate.
"Sea level readings now indicate that the threat has diminished for most areas, therefore the tsunami watch issued by this centre is now cancelled," said the US Pacific Tsunami Warning Centre in Hawaii, which monitored currents in the Indian Ocean following the earthquakes.
A bulletin from the National Tsunami Early Warning Centre in the South Indian city of Hyderabad said: "The expected period of significant tsunami waves is now over for all threatened Indian coastal areas."
An official at the centre, SA Kishore, said the highest tsunami warning level issued for the Andaman and Nicobar islands in the Bay of Bengal had been downgraded from red to orange.
A few thousand people were evacuated to higher ground from parts of India's Andaman and Nicobar islands.
"There could be high waves of 1.5 metres at Port Blair and 3.9 metres at Campbell Bay," said Prabhakar Rao, the official in charge of the disaster control room at Port Blair, the main town on the islands.
Small waves about half-a-metre high and within normal tide limits had already washed into the Campbell Bay area on the Great Nicobar island, the official said.
At least three tsunamis of up to 80cm hit Indonesia's coast earlier, the country's Meteorology and Geophysics Agency said.
A small tsunami measuring 10cm also reached Thailand's Andaman Coast.
Phillip Charlesworth, head of the International Federation of Red Cross and Red Crescent Societies delegation in the Indonesian capital, Jakarta, said that the first quake lasted for about three minutes.
"The shaking was quite violent, from conversations with our staff," he said.
"There appears to be no apparent damage. We certainly don’t know what the humanitarian impact is as yet.
"There are no reports of any tsunamis coming ashore, although local authorities are taking precaution of evacuating coastal communities."
There were several strong aftershocks, including one at a 8.2 magnitude and the depth of 10km.
"The aftershock continued for four minutes, and it was strong," an AFP news agency correspondent in Banda Aceh, the provincial capital, said. "People are panicking and running outside their home and from buildings."
The initial quake had struck at a depth of 33km, 495km from Banda Aceh.
People in Banda Aceh on the Indonesian island of Sumatra jumped into cars and the backs of motorcycles, clogging streets as they fled to high ground.
People on Twitter said tremors were felt in Singapore, Thailand, Malaysia and India. High-rise apartments and offices on Malaysia's west coast shook for at least a minute.
In Sri Lanka, residents on the coast were ordered to move inland to avoid being hit by any large waves.
A government statement said waves could hit the island's eastern port district of Trincomalee by about 10:40 GMT.
"There is a strong possibility of a tsunami hitting the island after the earthquake in Indonesia," meteorological department deputy director MD Dayananda said.
He said the quake in Indonesia was felt in Sri Lanka, which is 1,340km northwest from the location of the quake.
People near the coast in six Thai provinces were ordered to move to higher places and stay as far away as possible from the sea. The Phuket airport, located on the coastline, was closed.
Callan said phone lines were jammed as people were checking on their loved ones right after the tsunami alert was issued.
She said warning signals had been heard in southern provinces.
"Thailand is quite prepared for this. They hold drills regularly to be able to get tourists and residents to evacuate to higher areas," she said.
Indonesia straddles a series of fault lines that makes the vast island nation prone to volcanic and seismic activity.
A 9.1-magnitude quake off the country on December 26, 2004, triggered a tsunami in the Indian Ocean that killed 230,000 people, nearly three quarter of them in Aceh.
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