The US Geological Survey said the quake occurred at 0325 GMT at a depth of 160 kilometres, about 95 kilometres northeast of the Russian town of Yelizovo in the mountainous Kamchatka Krai region. It put the magnitude at 7.0.
Japan warns residents as small tsunami waves hit coast
The Russian Academy of Sciences said on its website the first tremor, which it said measured 7.3 in magnitude, was followed minutes later by a 5.2 magnitude aftershock.
Residents of regional capital Petropavlovsk-Kamchatsky felt the earth tremble, a spokesperson for the local branch of the Academy told Russia's Interfax news agency.
The quake struck in an area close to the "Ring of Fire", an arc of fault lines that circle the Pacific Ocean which is prone to frequent earthquakes and volcanic eruptions.
Earthquake in South Asia
The National and Pacific Tsunami Warning Centers said there was no risk the earthquake had caused a tsunami.
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