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English: A map showing the two definitions of the proposed "Republic of Cascadia." Green shows the American states of Oregon and Washington; and the Canadian province of British Columbia (which make up the standard definition). The black-dotted line marks the border of the Cascadia bioregion (which is also mentioned as a border).
The Cascadia bioregion. The area from Vancouver, B.C. down to Portland, Oregon has been termed the Cascadia Megaregion, a megaregion defined by the U.S. and Canadian governments, especially along the 'Cascadia Corridor'. Megaregions are defined as areas where "boundaries begin to blur, creating a new scale of geography now known as the megaregion.
The Pacific Northwest from outer space.. The Pacific Northwest (PNW; French: Nord-Ouest Pacifique), sometimes referred to as Cascadia, is a geographic region in Western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east.
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. [8] [9]
English: Map of the proposed Cascadia region, on a map of North America. This is a retouched picture , which means that it has been digitally altered from its original version. Modifications: Colored in the states of Oregon and Washington and province of British Columbia .
This map is approximately one-quarter the scale of the map below. (USGS [41]) The Southern Whidbey Island Fault (SWIF) is a significant terrane boundary manifested as an approximately four mile wide zone of complex transpressional faulting with at least three strands. [42]
Map of the Garibaldi Volcanic Belt centers. The Garibaldi Volcanic Belt in southwestern British Columbia is the northern extension of the Cascade Volcanic Arc in the United States and contains the most explosive young volcanoes in Canada. Like the rest of the arc, it has its origins in the Cascadia subduction zone.
Vashon Island sits in the midpoint of southern Puget Sound, between Seattle and Tacoma, Washington.In the nearby Pacific Ocean, roughly 170 miles (270 km) west of Vashon Island, lies the 700-mile (1,130 km) tectonic boundary known as the Cascadia Subduction Zone, and as such, Vashon Island is one of many areas at risk for earthquakes or related natural disasters.