A strong earthquake measuring 7.0 on the Richter Scale hit islands off northern Japan on Friday, officials said.
The epicentre of the earthquake, that struck at 12.12 pm (JST) was located at latitude 46.2 degree north and longitude 150.9 degree east, the Japan Meteorological Agency said.
The quake hit the Pacific Ocean at a depth of 10 km, reports said.
"Although there may be slight sea-level changes in coastal regions, this earthquake has caused no damage to Japan," the Japan Meteorological Agency website said.
No tsunami warnings has been issued.
The U.S. Geological Survey (USGS), however, said the magnitude of the quake was 7.2 on the Richter Scale.
The epicentre of the quake was located 250 km east-north-east of Russia´s Kuril'sk town, the USGS said.