A hidden shard of ancient crust has been detected where California’s San Andreas system collides with the Cascadia subduction zone, reshaping how I understand the tectonic engine of the West Coast.

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. When you purchase through ...

Along the remote coast where the San Andreas Fault meets the Cascadia subduction zone, earthquakes too small for humans to feel are sketching out a hidden map of danger. By tracking these tiny tremors ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. The Mendocino Triple ...

Three huge tectonic plates meet at the Mendocino triple junction off the coast of northern California, and a new study ...

By tracking swarms of very small earthquakes, seismologists are getting a new picture of the complex region where the San ...

It was a groundbreaking discovery. Scientists have found previously concealed fault lines along California’s north coast, sparking concerns that we could be drastically underestimating the earthquake ...

When it comes to emergencies and natural disasters, one of the main concerns for residents in California is earthquakes. World-renowned seismologist Dr. Lucy Jones says the San Andreas Fault is not ...

Large subduction-zone earthquakes leave scars on the continental slope in the deep sea.

A newly discovered fault complexity beneath America's most active earthquake zone raises the possibility that a major seismic ...

A 4.9-magnitude earthquake and several aftershocks rattled the Inland Empire on Monday night, according to the United States Geological Survey.

Imagining yourself in the shoes of a person experiencing "The Big One" can help us prepare now for a major earthquake, these ...