A magnitude-7.8 earthquake has struck Russia's eastern Petropavlovsk-Kamchatsky region, sparking tsunami warnings and alerts for parts of the United States, according to geological and weather authorities.

The quake hit 128 kilometres east of the Kamchatka Peninsula, located north-east of Japan, at a depth of 10 kilometres, an alert from the US Geological Survey said.

Several tsunami warnings were also issued after the quake by the US National Weather Service (NOAA), which estimated that tsunami waves could be possible for coastlines located within 1,000km of the quake epicentre.

The agency also said waves of up to three metres above a standard tide level were possible along some Russian coastlines.

The NOAA alerts reported potential tsunami threats for the Aleutian Islands and the Amc

See Full Page