A magnitude 7.3 earthquake occurred off the eastern coast of Japan off the coast of the Fukushima Prefecture.
The earthquake prompted the Japan Meteorological Agency to issue a tsunami advisory.
A tsunami of one metre has hit the area.
More than two million homes in Tokyo have lost power due to the earthquake.
The earthquake was originally measured as a magnitude 6.4 but was upgraded to a 7.3. It was at a depth of 63 km and was centred 57.2 km east-northeast of Namie, Japan.
This is a developing story.