For the first time in recorded history, downtown San Francisco was included in a tornado warning as severe storms swept through the city.

A 5.2 magnitude earthquake struck off the coast of Humboldt County late Saturday, according to the US Geological Survey.

It's been earthquake season across the United States in recent weeks. Over the past week or so, we've seen a significant ...

A late-night 5.2-magnitude earthquake shook the Pacific Ocean off the Northern California coastline, the U.S. Geological ...