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Structure of the Cascadia subduction zone. The Cascadia subduction zone is a 1,000 km (620 mi) long dipping fault that stretches from Northern Vancouver Island to Cape Mendocino in northern California. It separates the Juan de Fuca and North America plates. New Juan de Fuca plate is created offshore along the Juan de Fuca Ridge.
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."
The goal of this department is to conduct research in geology, mapping, hydrology, biology, and related sciences; evaluate hazards associated with floods, droughts, hurricanes, subsidence, human activity, and climate change; map the onshore and offshore geologic framework; assess mineral resources and develop techniques for their discovery ...
Vancouver Island lies in the eastern, North American region of the Cascadia subduction zone. ETS events in Cascadia were observed to reoccur cyclically with a period of approximately 14 months. [4] Analysis of measurements led to the successful prediction of ETS events in following years (e.g., 2003, 2004, 2005, and 2007).
The Cascadia subduction zone is capable of producing megathrust earthquakes on the order of MW 9.0. Due to the relative plate motions, the triple junction has been migrating northwards for the past 25–30 million years, and assuming rigid plates, the geometry requires that a void, called slab window, develop southeast of the MTJ. [4]
Zonia Baber collecting fossils at Mazon Creek, Illinois, as part of a Geology class in 1895 (University of Chicago Library) [2] Mary Arizona "Zonia" Baber (August 24, 1862 – January 10, 1956) [3] was an American geographer and geologist best known for developing methods for teaching geography. [4]
The Cascadia movement contains groups and organizations with a wide range of goals and strategies. Some groups, such as the Cascadian Bioregional Party, focus on the independence of the Cascadian bioregion [5] while others, such as the Cascadia Department of Bioregion, a 501(c)3 non-profit, seek to build a bioregionalist network as an alternative to the nation-state structure.
The geology of Illinois includes extensive deposits of marine sedimentary rocks from the Palaeozoic, as well as relatively minor contributions from the Mesozoic and ...