Russia's massive quake has already triggered at least 10 aftershocks, and could continue for months, according to scientists.

VLADIVOSTOK -- A 6.8 magnitude aftershock struck off Russia's Kamchatka Peninsula in the Pacific Ocean on Sunday, the regional branch of the Ministry of Emergency Situations announced on social media. The quake, which occurred at 17:37 local time (0537 GMT), was 277 km from Petropavlovsk-Kamchatsky, the regional capital, at a depth of 26 km.

Russia's Kamchatka Peninsula and surrounding Pacific Rim regions continued to experience seismic instability, with dozens of aftershocks being reported on Saturday by the United States Geological Survey (USGS).