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.
The quake was at a depth 10 km (6.2 miles), GFZ said.
The United States Geological Survey (USGS) pegged the magnitude at 7.4, with a depth of 39.5 km (24.5 miles).
The Pacific Tsunami Warning System said there was a threat of a possible tsunami from the earthquake.
In Japan, to the southwest of the Kamchatka Peninsula, no tsunami warning has been issued, broadcaster NHK reported, citing the Japan Meteorological Agency.
This is a developing story.
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