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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
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]
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.
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.
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 ...
Research by USGS geophysicist Danny Brothers indicates there have likely been at least 30 large earthquakes over the last 14,200 years in sections of the Cascadia subduction zone, which runs along ...
Cascadia subduction zone, United States and Canada: Unknown 9.2 Tsunami in Japan and the Pacific Northwest. 1700 Cascadia earthquake: 31 December 1703 02:00 (local time) Boso Peninsula, Japan: 10,000 8.2 Maximum intensity IX. 1703 Genroku earthquake: 28 October 1707 14:00 (local time) Japan: 5,000 8.7 Tsunami 1707 Hōei earthquake: 4 May 1714 Night
Image of the Juan de Fuca Plate that produced the magnitude 8.7–9.2 Cascadia earthquake in 1700. Magnetic anomalies around the Juan de Fuca and Gorda Ridges, off the west coast of North America, color coded by age. There are some unusual features at the Cascade subduction zone. Where the Juan de Fuca Plate sinks beneath the North American ...