A 7.0 magnitude earthquake struck off the coast of Humboldt County, California, prompting a brief tsunami warning for Northern California and Southern Oregon.

The alert, affecting over 5.3 million people, was canceled within an hour.

Governor Gavin Newsom expressed concern about potential damage in Northern California and signed a state emergency declaration to provide resources as needed, Yahoo News has reported.

No specific damage was reported, though early assessments were underway.

Written by B.C. Begley