The 5.8-magnitude quake hit at 9:11 am (local time) off Fukushima prefecture in the Pacific Ocean with the epicentre located 34 kilometres under the sea, according to the US Geological Survey.
Japan's meteorological agency said there was no risk of tsunami from the earthquake.
"We have found no (new) abnormality so far" at the Fukushima Daiichi plant, said a spokesman at Tokyo Electric Power Company, the operator.
Tokyo Electric is working to clean up and dismantle the reactors in a process that is expected to take at least four decades.
Fukushima police also said there were no immediate reports of damage or injuries.
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