What Scientists Have Found Inside the Cascadia Fault Shocked Everyone

For more than 326 years, one of North America’s most dangerous faults has remained locked beneath the Pacific Northwest.

The Cascadia Subduction Zone stretches roughly 600 miles from northern California past Oregon and Washington toward Vancouver Island. Scientists are now using GPS, offshore seismic imaging, sediment cores and more than 1,500 earthquake sensors to understand where the fault is locked, how strain is building, and what could happen when it ruptures again.

In this video, DiscoverTube investigates 20 major developments surrounding Cascadia — from the magnitude-9 earthquake of 1700 and a 10,000-year record of past ruptures to new offshore imaging that shows the fault is far more complex than scientists once thought.

We explore slow-slip events occurring deep underground, coastal land that could suddenly drop during a major earthquake, tsunami waves potentially reaching parts of the coast within minutes, and simulations showing how ShakeAlert could respond to a future magnitude-9 rupture.

Scientists cannot predict exactly when Cascadia will break.

But every new measurement is revealing more about what the Pacific Northwest could face when it eventually does.

Subscribe to DiscoverTube for more investigations into earthquakes, tectonic faults, tsunamis and the geological forces reshaping America.

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