A massive undersea earthquake with 6.4 magnitude struck Tokyo on early Friday morning, the US Geological Survey (USGS) said.
The USGS said the epicentre of the quake was 226 km south-east of Tokyo at a shallow depth of 10 km.
The Pacific Tsunami Warning Centre in Hawaii did not issue any tsunami warning. Authorities said there were no reports of any immediate damage or injury.
Meanwhile, Japan's weather agency said there could be slight changes in the sea level.
Japan is located at the junction of four tectonic plates and earthquakes are quite common in the country. The country sits on one of the world's most seismically active zones.
Reports show that Japan accounts for about 20 percent of the world's earthquakes of magnitude 6 or greater.
In August, there were two strong quakes that hit Japan back-to-back. A 5.3 magnitude undersea earthquake struck Japan off the coast of Ibaraki prefecture, south of Fukushima, following which another earthquake of 6.0 hit the northern cost. No serious damage was reported.
Japan is currently recovering from the damage caused by typhoon Malakas. More than 600,000 people were evacuated due to heavy flood and landslide in Kyushu, Japan's southernmost main island.
