At the Seismological Society of America's Annual Meeting, researchers posed a seemingly simple question: how wide are faults?

Millions of people across Southern California learned about a 5.2-magnitude earthquake that hit San Diego County on Monday ...

A moderately strong, 5.2-magnitude earthquake struck in Southern California on Monday, according to the United States ...

Scientists understand the basics of earthquakes. The Earth’s crust consists of large tectonic plates, massive slabs of rock moving slowly but constantly. When these plates rub against each other ...

The quake was centred in San Diego County, near the mountain town of Julian, and was felt as far north as Los Angeles ...