The quake measuring 8.7 on the Richter scale jolted sea areas northwest of Indonesia's Sumatra Sunday morning, the most powerful recorded in 40 years.
According to the State Seismological Bureau of China, the epicenter of the quake is 30 kilometers from the coast, approximately 300 kilometers from Medan and 200 kilometers from Banda Aceh.
The death toll of Sunday tidal wave devastation which hit the eastern and southern coasts of Sri Lanka had crossed 1,500 mark bypress time while the death toll reached 454 in Indonesia, more than 1,000 in India, 5 in Malaysia, 100 in Thailand and 1 in Maldives.
In addition to the dead, hundreds of other people were reported missing elsewhere, most of them fishermen at sea, in the region.
Sri Lankan prime minister's office said Sunday that some 1,500 people were killed and 1 million affected as tsunami tidal waves caused by an earthquake off Indonesia smashed into the island.
Massive sea waves crashed into coastal villages over a wide area of Sri Lanka on Sunday, killing more than 1,000 people and displacing 500,000 others, officials and hospital doctors said. The death toll was still rising, they warned.
The tidal waves also hit the neighboring Maldives, where the authorities closed the airport.
Maldives government officials said the waves were as high as one meter, hitting the low-lying capital Male, two-thirds of which was under water.
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