An quake with a magnitude of 6.2 struck off Fukushima Prefecture of Japan on Sunday, according to the Japan Meteorological Agency (JMA). The epicenter was off the northeastern coast of Japan, about 50 kilometres (31 miles) below the seabed.
No immediate tsunami warnings were issued by the Japanese authorities. There have also not been any reports of casualties or damage caused by the tremor.
Fukushima Prefecture is home to the crippled Fukushima No. 1 nuclear power plant.
No abnormalities were found at nuclear power plants in the region, including both Fukushima Daiichi and Daini, according to their operators.
Japan accounts for about 20 percent of the world's earthquakes of magnitude 6 or greater.
More than 18,000 were killed after a 9.0-magnitude natural disaster triggered a massive tsunami on March 11, 2011, leading to the meltdown of reactors at the Fukushima plant.