The moderate quake hit 34 kilometres (21 miles) east of coastal Namie city in Fukushima prefecture, where a devastating quake-tsunami in March 2011 sparked a nuclear disaster and caused massive damage.
Today's earthquake occurred at 2:18 am local time (1718 GMT) off the east coast of Japan's main Honshu island, at a depth of 63 kilometres, US geologists said in a preliminary report.
No tsunami warning was issued after the tremor, the Japan Meteorological Agency said, according to a news agency.


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