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

Northern California’s coast keeps you on alert, even on quiet days. Offshore, three tectonic plates meet near Humboldt County ...

Scientists are uncovering a hidden and surprisingly complex earthquake zone beneath Northern California by tracking swarms of ...

More than 300 years ago, a massive earthquake rocked the Pacific Northwest. That event came from the Cascadia subduction zone ...

A 6.0 magnitude earthquake strikes off Oregon coast, triggering tsunami alert and concerns of aftershocks, as the Cascadia ...

Emergency management officials provide scenario, encourage preparedness ...

Imagine a scenario where the Pacific Northwest gets pummeled by a magnitude nine earthquake, only to have California's most ...

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 ...

CARNATION, Wash. — A magnitude 3.0 earthquake struck near Carnation Wednesday night, according to the U.S. Geological Survey. The quake struck just after 8:20 p.m. at a depth of 27.1 kilometers, the ...

Seismic tremors reveal a shallow fragment of ancient tectonic plate beneath Northern California, helping explain damaging ...

Tremors beneath Northern California show hidden plate movement, helping scientists better understand where future big ...

Three of the great tectonic plates that make up the Earth’s crust meet at the Mendocino Triple Junction, off the Humboldt ...