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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 fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time.
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 Plate there is no deep trench, seismicity (earthquakes) is less than expected, and there is evidence ...
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]
Rapid subduction under the southwestern North America continent began 40 to 60 million years ago (Ma), [4] during the mid Paleocene to mid Eocene epochs. This convergent subduction margin created a distinctive geomorphologic feature called an oceanic trench , which occurs at a convergent plate boundaries as a heavy metal rich, lithospheric ...
West coast of United States ... North Greece: Normal to strike-slip ... 2750: West of Central America: Subduction zone: Active: 1982 El Salvador (M7.3), 1992 ...
Since the North American west coast has a convoluted structure, significant work has been required to resolve the complexity. [2] Tomographic imaging of the subducted Farallon plate beneath North America, showing that the velocities of sesimic waves vary based on the temperature of the material they are moving through.
The orogeny is commonly attributed to events off the west coast of North America, where the Kula and Farallon Plates were sliding under the North American Plate. Most hypotheses propose that oceanic crust was undergoing flat-slab subduction, that is, subduction at a shallow angle.