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TOKYO (Reuters) - A magnitude 6.3 earthquake hit northeastern Japan on Tuesday, the U.S. Geological Survey (USGS) said, but there were no reports of damages or casualties and a tsunami warning was not issued.
The quake, which shook buildings in the capital, Tokyo, struck off the northeast coast of the main island of Honshu at a depth of 20.5 miles, the USGS said.
Japanese broadcaster NHK and the U.S. Pacific Tsunami Warning Center said there was no danger of a tsunami.
Tokyo Electric Power Co said there were no abnormalities at its nuclear plant in Fukushima, which was severely damaged just over a year ago by a magnitude 9 quake, Japan's strongest on record, which triggered a big tsunami and caused the world's worst nuclear crisis in 25 years.
Nearly 20,000 people were killed in the March 11 quake last year.
On Tuesday, high-speed bullet trains serving northern Japan were halted but resumed later after no damage was reported, NHK said.
There has been a five-fold increase in earthquakes in the Tokyo metropolitan area since the year-ago disaster, the Tokyo University Earthquake Research Institute has said.
Reporting by Reuters staff