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New Seattle tunnel designed to ride out catastrophic 9.0 quake, DOT says
SEATTLE – The new Highway 99 tunnel opening in early February has been constructed to withstand a powerful once-in-2,500-years earthquake of roughly 9.0 magnitude off the Washington coast, state Department of Transportation officials said Monday.
And that, in its most basic terms, is why the tunnel is such a dramatic improvement over the Alaskan Way Viaduct, according to transportation officials.
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