The authorities have issued warnings of a possible tsunami for the coastal areas within 300 km of the region.
A powerful earthquake shook areas off the coast of eastern Russia late on Tuesday morning, local time, prompting tsunami advisories.
Officials said preliminary info indicates there is no tsunami danger for the U.S. West Coast or Alaska.
The Pacific Tsunami Warning Center said the quakes could generate tsunami waves for coastlines near the epicenter in Russia.
Initial automated reporting systems indicate the quake happened at a depth of about 10km, potentially sending ripples through the seafloor above. According to US Geological Survey, the major earthquake that hitRussia was originally recorded as 7.4 magnitude, but it has been upgraded to magnitude 7.8 magnitude on the richter scale.
It is not yet clear what kind of damage the earthquake has caused, if any. The Komandorski and Aleutian Islands form a chain between the two continents.