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The Cascadia subduction zone is a 960 km (600 mi) fault at a convergent plate boundary, about 100–200 km (70–100 mi) off the Pacific coast, that stretches from northern Vancouver Island in Canada to Northern California in the United States
Over the past century, scientists have only observed five magnitude-9.0 or higher earthquakes — all megathrust temblors like the one predicted for the Cascadia Subduction Zone.
A nightmare scenario for Northern California, as well as Oregon and Washington, would be a magnitude 9 earthquake along the Cascadia subduction zone off the coast.
Scientists say that the Cascadia subduction zone off the coast of the Pacific Northwest has the potential to spark a magnitude-9.0+ earthquake, plus a subsequent tsunami. That scenario last ...
A 2004 study revealed the potential for relative mean sea level rise (caused by subsidence of coastal land) along the Cascadia subduction zone. It postulated that cities on the west coast of Vancouver Island, such as Tofino and Ucluelet, are at risk for a 1-to-2-metre (3 ft 3 in to 6 ft 7 in) subsidence, relative to mean sea level. [22]
Western Washington lies over the Cascadia subduction zone, where the Juan de Fuca plate is subducting towards the east (see diagram, right). This is being obliquely overridden by the North American plate coming out of the northeast, which has formed a bend in the subducting plate and in the forearc basin above it.
The Cascadia Subduction Zone is one of the biggest hazards in the U.S. The fault runs offshore along the West Coast from Northern California to northern Vancouver Island in Canada. It is capable ...
North of the Mendocino triple junction, the Gorda plate is subducting beneath the North American plate at the Cascadia subduction zone, with a convergence rate of 2.5–3 centimeters (0.98–1.18 in) per year, but comparisons with other subduction zones have led to a belief that the convergence may be taking place aseismically.