Beneath the everyday routines of millions of Southern Californians, two tectonic plates are sliding past each other along a fault line that has not fully released its accumulated strain in generations ...

Add Yahoo as a preferred source to see more of our stories on Google. Tectonic stress building beneath Southern California could have far-reaching consequences for millions of residents from the ...

The San Andreas fault is the most famous fracture in the American landscape, a roughly 800-mile scar running the length of California where two of the planet’s great tectonic plates grind past each ...

The volatile seismic zone along the roughly 750-mile (1,200-km) San Andreas Fault and the smaller San Jacinto Fault are now "critically stressed" – reaching a 1,000-year high level of pressure – ...

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A police car guards a section of a Los Angeles freeway cracked by the magnitude 6.7 Northridge earthquake in 1994. | Steve Starr/CORBIS/Corbis via Getty Images “The Big One,” the theoretical ...

When the tectonic subduction zone beneath the Pacific Northwest moves, it does so in dramatic fashion. Not only is ground shaking from a magnitude 9+ earthquake incredibly destructive, the event ...

Scientists say there's new evidence that two of the best-known earthquake fault lines on the West Coast are in sync. SAN FRANCISCO -- Scientists say there's new evidence that two of the best-known ...

When people think about geological faults, they usually think about earthquakes. Yet faults do not move only during earthquakes. Sometimes they slip silently, without generating noticeable shaking, ...

Add Yahoo as a preferred source to see more of our stories on Google. California's earthquake time bomb may be ticking faster than scientists realized. Just a week after a magnitude 3.9 quake rattled ...