The earthquake was centred in Ibaraki Prefecture, just northeast of Tokyo, Japan's Meteorological Agency said. The depth of the earthquake was 50km and there was no risk of a tsunami, it added.
Japan Atomic Power Co and Tokyo Electric Power Co (Tepco) reported no irregularities at their three nuclear plants in eastern Japan.
A Japan Atomic official said there have been no irregularities at the 1.1-gigawatt Tokai Daini plant, which has been shut since May 2011. A Tepco spokeswoman said there has been no irregularities at the Fukushima-Daiichi nuclear plant, wrecked by the March 2011 quake and tsunami, and Fukushima-Daini plant, which has been shut since March 2011.
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