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A large earthquake was registered Monday off Indonesia's Sumatra Island, the U.S. Geological Survey reported, describing it as a "great earthquake" with a magnitude of 8.2 on the Richter scale.
No reports had been received from the region. The Dec. 26 quake that launched the massive tsunami was a 9.0, the USGS said.
Monday's quake epicenter was reported 150 miles southwest of Medan in northern Sumatra, and located at 18.6 miles underground. It occured at around 11 p.m. local time.
The quake struck in the sea off the coast of Sumatra about 1609 GMT, according to the US Geological Survey.
A USGS spokeswoman said it hit 125 miles northwest off Sibolga, Sumatra.
It was close to where a nine magnitude quake triggered a devastating Tsunami in Asia on Boxing Day which left about 300,000 people dead or missing.
USGS Spokesman Don Blakeman said: "Certainly evacuations should be occuring, I hope they are."
He said any tsunamis should not be as widespread as during the December tragedy.