A magnitude 6.4 earthquake occurred off Japan's northern island of Hokkaido on Saturday night.
Citing the Japan Meteorological Agency, Kyodo news agency said there was no threat of tsunami, citing the Japan Meteorological Agency.
The United States Geological Survey said it was at a depth of 103km at 11.17pm, near the town of Obihiro. Earlier, the agency measured the quake at magnitude 6.9.
Shaking lasted about a minute.
The quake was preceded by an early warning broadcast on television and radio. There was no damage to nuclear facilities.
NHK said 10 people had minor injuries due to falling objects, broken glass and other incidents, but no serious damage was reported.
The USGS said a magnitude 5.5 tremor occurred off the Izu islands, around 725km south of Tokyo, four hours after the quake.
