The earthquake in the Russian region was confirmed Thursday by the Geophysical Service of the Russian Academy of Sciences.
According to seismologists, the earthquake struck at about 5:01 a.m. local time (17:31 PM GMT).
The Pacific Tsunami Warning Center (PTWC) has issued a tsunami alert within a radius of some 186 miles from the epicentre.
At the moment, there is no information about any victims in the incident.