At 12:31am on January 23, 2018, a magnitude 7.9 earthquake struck in the Gulf of Alaska about 180 miles southeast of Kodiak Island. While an appreciable tsunami wave did not occur, the location and size of the event spurred middle-of-the-night evacuations in several coastal communities.

This ground motion visualization shows 30 minutes of shaking as the energy from the Offshore Kodiak Earthquake radiates across Alaska. If you watch closely, you can see smaller aftershocks occurring as well.