A new study uncovered hidden activity on California's fault lines.

Once in a while, the people of California have the ground reminded of the fact that the ground is, in reality, unrest. Throughout the past 24 hours, a series of earthquakes of varying intensity, ...

But in Southern California’s Imperial Valley, the earth has been shaking. In less than a day, more than 40 earthquakes shook ...

For more than a month, the Bay Area has been subjected to a seemingly ceaseless stampede of earthquakes — the latest in a series of seismic swarms that have rattled windows and raised fears across ...

Onlookers gaze out to sea at the Sutro Baths overlook in San Francisco on Dec. 5, 2025. A tsunami warning was issued after a magnitude 7.0 earthquake struck off the coast of the Humboldt Peninsula, ...