An earthquake of magnitude 7.1 struck near the east coast of Russia's Kamchatka region on Saturday, the German Research Centre for Geosciences (GFZ) said.
According to GFZ, the quake was at a depth 10 kilometres.
The United States Geological Survey (USGS) pegged the magnitude at 7.4, with a depth of 39.5 km.
The Pacific Tsunami Warning System said there was a threat of a tsunami.
In Japan, to the southwest of the Kamchatka Peninsula, no tsunami warning has been issued, broadcaster NHK reported, citing the Japan Meteorological Agency.
US carrying out rescue effort after losing aircraft in Iraq
One French soldier killed, 6 injured in Iraq after drone attack
Suspect shot dead after crashing truck into Detroit-area synagogue
Australia releases petrol and diesel from emergency reserves
Cuba to release 51 prisoners in Vatican-brokered deal
