The epicentre of the 7.23 p.m. (1023 GMT) earthquake was off the coast of Fukushima prefecture and measured at a depth of 50 km (30 miles), the agency said. There were no were immediate reports of damage.
Four dead, several injured after powerful quake rocks Indonesia
Earthquakes are common in Japan, one of the world's most seismically active areas. Japan accounts for about 20% of the world's earthquakes of magnitude 6 or greater.
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