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.

Palestinian teen shot dead in Israeli West Bank raid, Wafa reports
Some 287 nominated for 2026 Nobel Peace Prize, Trump likely among them
Libya says 17 migrants perish at sea, nine missing feared dead
Israel begins intercepting Gaza aid ships far from shores, army radio says
Trump urges Iran to sign a deal and discusses prolonged blockade