A group of fault lines sit underground near Van Horn, Texas, dating up to 1.6 million years old, according to a map published by the U.S. Geological Survey (USGS) While the fault lines might have been ...

The 4.8-magnitude earthquake on the East Coast Friday came from ancient dormant faults. The faults formed when two continents collided about 500 million years ago, creating the Appalachians and ...

Major faults like the San Andreas strike fear of producing devastating earthquakes. But scientists have found that little-known 'branch' faults, minor faults that stem from larger ones, could release ...

Researchers have discovered evidence of “partial synchronization” of two of the world’s most famous fault lines—the northern San Andreas Fault and Cascadia Subduction Zone. The relationship between ...

A massive fault line that was long considered dormant is showing signs of activity, raising concerns among scientists and residents alike. Recent seismic events have prompted a re-examination of this ...

Here’s what you’ll learn when you read this story: The Tintina fault is thought to have been inactive for more than 40 million years, but new research suggests that earthquakes occurred in the zone ...

The fault that triggered the deadly Napa earthquake may be more dangerous than originally thought, according to an expert with the United States Geological Survey. In 2014, a 6.0 magnitude earthquake ...

CITYWIDE — It's a seismic year for Santa Monica. In the 20th year since the destructive Northridge Earthquake, city officials announced they would assess buildings that might need seismic upgrades and ...

Magnetic data suggest Seattle's fault line formed 55 million years ago, when the southern half of a subducting chain of volcanic islands piled onto the continent and tore apart from the northern half.

This article is part of Shaky Ground, a collaborative reporting project between the Carlsbad Current-Argus and KRWG Public Media. A group of fault lines sit underground near Van Horn, Texas, dating up ...