One of the most powerful earthquakes in modern history shook Russia’s remote east coast Wednesday, sending tsunami waves hurtling across the Pacific Ocean and putting nations from Japan to the United States to Chile on high alert with millions urged to evacuate.

The magnitude 8.8 quake is believed to be the joint sixth-largest on record, though only minor injuries near the epicenter have been reported.

Tsunami alerts were also in effect in Alaska, the U.S. West Coast and down the Pacific Rim to New Zealand. The earthquake, centered about 78 miles southeast of Petropavlovsk-Kamchatsky, ranks among the "top six strongest" ever recorded,