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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
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."
Near Astoria Canyon, it is at a depth of 2,740 metres (8,990 ft). The fan is approximately 75 miles (121 km) long. It varies in width from 1.5 miles (2.4 km) to 8.3 miles (13.4 km). [3] It has numerous tributaries. [4] The fan extends about 100 kilometres (62 mi) to its western boundary, which is the Cascadia Channel.
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. It lies just west of the Cascadia subduction zone , [ 1 ] and was discovered in August 1950 by the U.S. Fish and Wildlife Service fisheries research vessel R/V John ...
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.
Ohio Caverns is a show cave located 30 miles (48 km) from Dayton, Ohio near West Liberty, in Salem Township, Champaign County, Ohio in the United States.A popular tourist destination and member of the National Caving Association, it is the largest of all the cave systems in Ohio and contains many crystal formations.
Geology of the volcano, the eruption and the recovery of the area's plant and animal life, operated by the Washington State Parks and Recreation Commission: Mukilteo Light: Mukilteo: Snohomish Puget Sound Maritime Lighthouse tours, maritime and local history exhibits Museum & Arts Center in the Sequim-Dungeness Valley: Sequim: Clallam: Olympic ...