Marina Kolomiyets, spokeswoman for Obninsk's seismic station of the Russian Academy of Sciences, said today the epicentre was in the Sea of Okhotsk, east of the Russian coast and north of Japan. She said the quake registered 8.0 on the Richter scale.
Emergency agencies in the Far East issued a tsunami warning for Sakhalin and the Kuril islands, but lifted it soon afterwards.
Kolomiyets said the earthquake originated 600 kilometres underground and with the tremors so far down they have the potential to spread quite far.
Russian news agencies also cited eyewitnesses reporting strong tremors across Siberia.