A volcano in eastern Russia erupted for the first time in 475 years, prompting a tsunami warning. The Krasheninnikov volcano in Kamchatka became active days after one of the strongest earthquakes ever recorded hit the region.

Russia’s magnitude 8.8 earthquake spawned serious tsunami warnings, but waves have been moderate so far. Here’s the geological reason why

Tsunami alerts were issued for Alaska and Hawaii on Tuesday after a major, 8.8 magnitude earthquake struck off the coast of Russia, according to officials.