The quake was centered 160 kilometers under the seabed near Izu Oshima island south of Tokyo.
The quake was felt across a wide area of Japan, with the strongest in central Tokyo.
According to the press, this was the strongest ever quake felt in Tokyo since the aftershocks in Japan, which measured 9 on the richter scale and the Tsunami on the northeastern coast, leaving 18,500 people dead or missing.
The Fukushima Dai-Ichi nuclear plant is said to be safe, which was affected after the 2011 disaster.
According to NHK, some trains services would be delayed and that speed restrictions were imposed on expressways that were affected as a precaution.