The National Tsunami Warning Center (NTWC) issued warnings, watches and advisories after the temblor struck about 7:30 p.m. ET on July 29, about 78 miles east-southeast of Petropavlovsk-Kamchatsky, the U.S. Geological Survey reported. The city is in Kamchatka Krai, Russia, in the Far East of the country by the Pacific Ocean.

Tsunami waves have reached Hawaii and California after a powerful earthquake occurred off the coast of Russia. Here's what you need to know about the tsunami's impact and how long it might last.

The 8.8 magnitude temblor struck off the coast of the Kamchatka Peninsula, an isolated strip along the Pacific Ocean, overnight. Residents of the peninsula fled inland as 16-foot waves caused flooding.