An earthquake of 5.9 magnitude shook eastern Japan tonight though there was neither a tsunami warning, nor any immediate reports of damage.
The quake hit the Fukushima Prefecture and its vicinity, areas that were devastated by a massive quake-triggered tsunami last year and caused a major nuclear crisis.
The quake that struck at 11:04 p m (local time) measured a lower 5 on the Japanese intensity scale of 7 in the eastern towns of Naraha and Tomioka, the Japan Meteorological Agency said.
No tsunami warning was issued, according to Kyodo news agency.
Tokyo Electric Power Co said there were no fresh abnormalities at the Fukushima Daiichi and Daini nuclear power plants following the quake.