The Earth’s Crust Is Disintegrating Off the Coast of the Pacific Northwest

A massive fault beneath the Pacific Northwest has been silent for centuries.

But scientists have now found something unexpected happening deep below the ocean: the Juan de Fuca plate feeding the Cascadia Subduction Zone appears to be tearing apart.

In this DiscoverTube investigation, we explore the latest research beneath Cascadia — from a newly imaged plate tear near Vancouver Island to trapped fluids inside the fault, a hidden network of secondary faults beneath Seattle, and updated measurements suggesting parts of the Oregon coast could experience stronger shaking than previously estimated.

We also look at new evidence suggesting Cascadia and the San Andreas system may interact more closely than scientists once thought.

The Cascadia Subduction Zone stretches roughly 700 miles from Northern California to Vancouver Island and is capable of producing a magnitude 9-class earthquake and major tsunami.

But the new research does not mean the plate is suddenly collapsing.

The tearing is happening over millions of years.

What has changed is scientists’ understanding of the complicated structures surrounding the fault — and how those structures could influence the next major rupture.

🌎 Subscribe to DiscoverTube for more earthquakes, geology, tectonic discoveries and developing science from beneath the Pacific Northwest.

Which discovery concerns you more: the plate tearing beneath Vancouver Island, or the stronger shaking now modeled for parts of Oregon?

0:00 The Cascadia mystery
1:29 Understanding the fault
3:22 Evidence from the past
4:57 A plate breaking apart
6:53 Fluid dynamics of the fault
8:26 Cabled seafloor monitoring
10:13 Seattle's hidden fault web
11:58 Fault synchronization
13:44 Updated hazard models
15:49 Preparing for the Big One
17:51 Detection and safety

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