A strong earthquake hit the northern island of Hokkaido, as walls collapsed and blackouts broke out.
The earthquake, which occurred on Thursday at 3 a.m. local time, had a magnitude of 6.7, said the Japan Meteorological Agency.
The United States Geological Survey said earlier that it had reached about 112 km southeast of Sapporo at a depth of 66 km.
There is no risk of tsunami, said the United States Geological Survey.
The public broadcaster NHK showed a wall of collapsed brick and broken glass in a home and quoted local police when they reported that there were power cuts and that some people were trapped in collapsed structures.
Reports of power outages in the northernmost prefecture of Japan have been shared on social networks.
The earthquake occurs after the southern part of the country was hit by the biggest typhoon it hit in 25 years.