A hidden chunk of an ancient tectonic plate is stuck to the Pacific Ocean floor and sliding under North America, complicating ...

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

Federal emergency planners treat the Cascadia Subduction Zone as one of the clearest natural-disaster threats in North ...

When Washingtonians talk about the possibility of a major earthquake in the Cascadia Subduction Zone, the conversation typically focuses on the immediate impacts: the threat of casualties, building ...

PORTLAND, Ore. (KOIN) – January 26 marked the 325th anniversary since the last earthquake struck the Cascadia Subduction Zone. Centuries later, the ancient quake has left clues for scientists to ...

Two of the West Coast’s most dangerous fault lines might be more in sync than scientists have realized. A new study found that the two sleeping giants, the Cascadia subduction zone and the northern ...

Julia Shumway / Oregon Capital Chronicle The so-called “Big One” or Cascadia Subduction Zone earthquake expected to trigger disruptive quakes throughout the West Coast could cause more damage than ...

Residents walk toward the designated safe area in a tsunami drill, in Samoa, California, in 2007. A silent colossus lurks off the Pacific coast, threatening hundreds of miles of coastline with ...

When an earthquake rips along the Cascadia Subduction Zone fault, much of the U.S. West Coast could shake violently for five minutes, and tsunami waves as tall as 100 feet could barrel toward shore.