California is riddled with a number of fault lines that frequently cause earthquakes, including Arrowhead, Waterman Canyon, ...

A third earthquake struck California in less than six hours, this one rocking the city of Hayward near San Francisco and San ...

The strongest was a 3.4 magnitude quake that struck near San Bernardino, with more than 500 people feeling the quake.

A third earthquake shook the Southern California area, the U.S. Geological Survey reported. Getty Images/iStockphoto A 3.6-magnitude earthquake shook the Southern California area — the third ...

A 3.5-magnitude earthquake struck Southern California, then a 3.0 quake followed, the U.S. Geological Survey reported. Getty Images/iStockphoto Back-to-back earthquakes shook the Southern ...

Discover interesting facts about how big earthquakes can get, why earthquakes happen, and why they're so hard to predict.