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Scientists have mapped one of the most hazardous spots on the globe in unprecedented detail: a 600-mile geologic boundary just off the Pacific Northwest coast.

Along this fraught stretch, called the Cascadia subduction zone, two pieces of the Earth’s crust slide against each other, building up stresses capable of unleashing a catastrophic 9.0-magnitude earthquake and generating a tsunami, with waves as high as 40 feet.

What is Cascadia megathrust?

Cascadia megathrust is a major geological feature located off the Pacific Northwest coast of North America. It is a convergent plate boundary, or subduction zone, where the Juan de Fuca Plate is being forced, or subducted, beneath the North American Plate. This tectonic interaction has a potential for large earthquakes and tsunamis.

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