There have been more than 400 tremors recorded in this swarm as of May 11. How unusual is this?

Add Yahoo as a preferred source to see more of our stories on Google. When a rapid succession of earthquakes occurs, like it has in recent weeks, it always brings the same conversation to office water ...

The string of moderate earthquakes occurred within hours along a seismically active stretch near the California–Oregon border ...

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According to reporting based on U.S. Geological Survey data, a magnitude 4.9 earthquake struck Riverside County at 5:56 p.m. local time, centered roughly seven miles from Indio. The quake was shallow, ...

The quake struck at 10:44 a.m.Thursday. The shaking reached as far as the San Francisco Bay Area, nearly 270 miles away. People there said they felt both the initial quake and several waves of ...