The depth of the quake was estimated to be around 11km (7 miles).
In 2011, a large tsunami caused by a quake destroyed the Fukushima nuclear power plant.
Tokyo Electric Power has been checking the plant for damage from the latest quake.
Cabinet Chief Secretary Yoshihide Suga told a televised news conference that the water cooling system on the third reactor of the Fukushima plant had stopped working, but there were no signs of temperatures rising and no other abnormalities at other nuclear facilities.
The government has set up a special taskforce to monitor the situation, he said.
BBC
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