By tracking swarms of very small earthquakes, seismologists are getting a new picture of the complex region where the San Andreas fault meets the Cascadia subduction zone, an area that could give rise ...

One of the most terrifying discoveries for the US population in general has just been made off the north coast of California. Scientists have found geological faults that had remai ...

Researchers have identified an ancient tectonic fragment, the Pioneer fragment, buried under the coast, which may exacerbate earthquake hazards associated with the San Andreas and Cascadia faults.

A new study uncovered hidden activity on California's fault lines.

What appears to be three tectonic plates in a map may act like five pieces that move underground. Northern California ...

A hidden chunk of an ancient tectonic plate is stuck to the Pacific Ocean floor and sliding under North America, complicating earthquake risk at the Cascadia subduction zone.

The San Andreas Fault is the longest and fastest-moving, but over the next decade, Dr. Lucy Jones says it'll probably be one of the lesser-known faults that causes the most damage.

Drop. Cover. Hold on. That’s the three-part jingle every Californian learns to stay safe in earthquake country. Scientists forecast a more than 99% chance that earthquakes of 6.7 magnitude or larger ...

Earthquakes remain one of the top concerns for millions of Californians. While the San Andreas Fault dominates the public imagination, a leading expert says the state’s seismic risk is far more ...

More than 70 percent of Californians live within 30 miles of a major fault.