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

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.

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 ...

It was a groundbreaking discovery. Scientists have found previously concealed fault lines along California’s north coast, ...

Scientists warn that the Cascadia Subduction Zone is capable of unleashing a massive 9.2 earthquake and tsunami that could cripple the Pacific Northwest. This video explains why the region is ...

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

Compiled by Bob Duke From the pages of Astoria’s daily newspapers 10 years ago — 2016 When the men and women of U.S. Coast ...

Tiny earthquakes reveal hidden fault structures beneath Northern California, reshaping understanding of regional earthquake ...

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 ...

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

In "Oregon Ready," KLCC host Love Cross embarks on her own journey to become "2 Weeks Ready," inspired by the Pledge to ...