The threat of ‘The Big One’ has long loomed over the Pacific Northwest, where several major cities from Vancouver down to northern California are cradled by the 620-mile-long Cascadia Subduction Zone.
The geological record shows the area is due for a major earthquake, which would likely be followed by a massive tsunami.
Now, a new study has confirmed the region just off the coast of Washington has the ingredients for a megaquake.
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