Hidden Earthquake Threat: Oregon’s Fault May Be Closer to the Surface Than Scientists Thought

A new seismic study suggests the Juan de Fuca slab beneath northern Oregon is shallower than expected.

Researchers used temporary seismometers and offshore data to map the Cascadia subduction zone more precisely.

The slab may be about 5 km shallower near the coast, which could raise shaking estimates for future earthquakes.

The team also identified a sedimentary basin under Tillamook that may amplify ground motion.

If confirmed, the findings could affect earthquake hazard planning and building resilience across northern Oregon.