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A magnitude 6.0 earthquake has rattled northeastern Japan, but authorities have not issued a tsunami warning.
There were no immediate reports of casualties or damage to property on Friday and no abnormalities were found at the region's nuclear power facilities, including the crippled Fukushima Daiichi Nuclear Power Station, according to the Nuclear Regulation Authority.
The quake occurred at 8.58am (0958 AEST), its epicentre off the coast of Fukushima prefecture at a depth of 40 kilometres, the Meteorological Agency said.
In February, a magnitude-7.3 quake also struck the northeast, killing one person and injuring about 190 others.
Japan recently observed the 10th anniversary of the magnitude 9.0 quake and resulting tsunami in the same region on March 11, 2011, which left about 18,400 dead or missing.
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