A moderate earthquake with a magnitude of 4.8 on the Richter scale struck Tokyo on Friday, meteorologists said.
The quake, which hit at 5:18 pm, was centered in Tokyo Bay at the depth of 70 kilometers, the Japan Meteorological.
The tremor was felt in the heart of the Japanese capital, although there were no immediate reports of damage.
The meteorological agency said the quake was felt most strongly in Kanagawa prefecture facing the bay.
Japan lies at the junction of four tectonic plates and endures about 20 percent of the world's powerful earthquakes, frequently jolting Tokyo and other major cities.
The tremor comes one day before the anniversary of Tokyo's last major earthquake in 1923, which left more than 142,000 people dead or unaccounted for.