According to the US Geological Survey (USGS), an earthquake with a preliminary magnitude of 5.9 has hit eastern Japan, but no tsunami warning has been issued.
No reports of damages or injuries are reported, but the quake reportedly shook buildings in Tokyo.
According to the nuclear regulator in Japan, no irregularities were observed at the Fukushima Daiichi nuclear plant, where one of the world's worst nuclear accident unfolded after a March 2011 earthquake.
That earthquake was recorded as magnitude 9 and was the strongest quake ever recorded in Japan, till date. The quake generated a tsunami that knocked out the Fukushima plant, causing the worst nuclear crisis since Chernobyl a quarter of a century earlier. About 25,000 people were killed by the tsunami along Japan's north-east coast.