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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 great subduction earthquake, such as the magnitude M 9 1700 Cascadia earthquake, caused by slippage of the entire Cascadia subduction zone, from approximately Cape Mendocino in northern California to Vancouver Island in British Columbia.
The name "Cascadia" was first applied to the whole geologic region by Bates McKee in his 1972 geology textbook Cascadia; the geologic evolution of the Pacific Northwest. Later the name was adopted by David McCloskey, a Seattle University sociology professor, to describe it as a bioregion. McCloskey describes Cascadia as "a land of falling waters."
Evolution of the Pacific Northwest Good text on the geology of Cascadia. One link on Northwest geology; Reducing Earthquake Losses Throughout the United States: Averting Surprises in the Pacific Northwest (USGS) USGS site on earthquakes; On the eruption of Mt. Meager Archived 2007-04-17 at the Wayback Machine
And there are the infrequent but very powerful great subduction events, such as the magnitude 9 1700 Cascadia earthquake, where the entire Cascadia subduction zone, from Cape Mendocino to Vancouver Island, slips. [29] But the Seattle and Tacoma faults are probably the most serious earthquake threat to the populous Seattle–Tacoma area.
Cobb Seamount is a seamount (underwater volcano) and guyot located 500 km (310 mi) west of Grays Harbor, Washington, United States. [2] Cobb Seamount is one of the seamounts in the Cobb–Eickelberg Seamount chain, a chain of underwater volcanoes created by the Cobb hotspot that terminates near the coast of Alaska.
Glacial erratic boulders of King County are large glacial erratic boulders of rock which were moved into King County, Washington by glacial action during previous ice ages.. The Pleistocene ice age glaciation of Puget Sound created many of the geographical features of the region, including Puget Sound itself, [1] and the erratics are one of the remnants of that age. [2]
The Mendocino Fracture Zone between the Gorda plate and Pacific plate (only the active section is traced) The Mendocino fracture zone is a fracture zone and transform boundary over 4000 km (2500 miles) long, [1] starting off the coast of Cape Mendocino in far northern California.
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