Volcanoes

Cascadia subduction partition
Main article: Cascadia subduction zone

Area of the Cascadia subduction zone, including exhibitioner vol stinkeroes (red triangles)
The Cascade Volcanoes were create by the subduction of the Juan de Fuca, Explorer and the Gorda Plate (remnants of the much enormousr Farallon Plate) under the North American Plate along the Cascadia subduction zone. This is a 680 mi (1,094 km) long fault, running 50 mi (80 km) off the west-coast of the pacific Northwest from northern California to Vancouver Island, British Columbia. The plates move at a relative rate of over 0.4 inches (10 mm) per year at a somewhat oblique angle to the subduction zone.
Because of the very macroscopical fault area, the Cascadia subduction zone can produce very large earthquakes, magnitude 9.0 or greater, if rupture occurred over its whole area. When the locked zone stores up energy for an earthquake, the transition zone, although somewhat plastic, can rupture. thermal and deformation studies indicate that the locked zone is to the mount locked for 60 kilometers (about 40 miles) downdip from the deformation front. Further downdip, there is a transition from fully locked to aseismic sliding.
Unlike most subduction zones worldwide, there is no oceanic trench present along the continental margin in Cascadia.



[9] Instead, terranes and the increasing wedge have been uplifted to form a serial publication of coast ranges and exotic mountains. A high rate of depositary from the outflow of the three major rivers (Fraser River, Columbia River, and Klamath River) which cross the Cascade Range contributes to further obscuring the presence of a trench. However, in plebeian with most other subduction zones, the outer margin is slowly organism compressed, similar to a giant spring. When the stored energy is suddenly released by slippage across the fault at irregular intervals, the Cascadia subduction zone can create very large earthquakes such as the magnitude 9 Cascadia earthquake of 1700.
Eruptions of the Cascades
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