A Hidden Earthquake Threat Emerges After Scientists Discover a Terrifying Crack
Scientists discover a shallower fault in Cascadia, increasing risk for stronger earthquakes and tsunami preparedness.
The Threat Comes From Cascadia
The Fault May Be Shallower Than Expected
Stronger Shaking Could Hit Northern Oregon
The Discovery Came From a New Look Below the Coast
Cascadia Has Been Quiet Since 1700
Officials Already Treat Cascadia as a Major Hazard
The “Crack” Is Really a Tectonic Boundary
Tsunami Risk Remains Part of the Picture
The Finding Does Not Predict an Immediate Earthquake
The Real Concern Is Preparedness
-
1 / 10
A new earthquake concern has emerged off the Oregon coast, but it is not about a dramatic crack opening across a road or a city street. The warning comes from something much harder to see: a hidden part of the Cascadia Subduction Zone, where one tectonic plate dives beneath another and stores the kind of stress that can produce powerful earthquakes.
Scientists now think part of the fault system near northern Oregon may be closer to the surface than earlier models suggested. That matters because a shallower fault could bring stronger shaking to coastal communities during a future Cascadia megathrust earthquake. The discovery does not mean a quake is imminent, but it may change how scientists estimate risk.