A 5.5 magnitude earthquake struck Tokyo on Monday, according to the US Geological Survey (USGS).
However, there were no immediate reports of injuries or damage. The authorities said there was no threat of tsunami.
The USGS said the quake's epicentre was located under the sea on Japan's northeast coast. The epicenter was quite close to the site of the 2011 earthquake of 9 magnitude, leading to a massive tsunami that killed almost 20,000 people.
Japan is located at the junction of four tectonic plates and it experiences relatively violent quakes every year.
Reports show that Japan accounts for about 20 percent of the world's earthquakes of magnitude 6 or greater.
