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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.
Today, the Cascadia Subduction Zone remains eerily quiet. In other subduction zones, scientists often observe small earthquakes frequently, which makes the area easier to map, according to ...
Scientists say that the Cascadia subduction zone off the coast of the Pacific Northwest has the potential to spark a magnitude-9.0+ earthquake, plus a subsequent tsunami. That scenario last ...
Western Washington lies over the Cascadia subduction zone, where the Juan de Fuca plate is subducting towards the east (see diagram, right). This is being obliquely overridden by the North American plate coming out of the northeast, which has formed a bend in the subducting plate and in the forearc basin above it.
Recent findings conclude that the Cascadia subduction zone is more complex and volatile than previously believed. [18] In 2010, geologists predicted a 37% chance of a magnitude 8.2+ event within 50 years, and a 10% to 15% chance that the entire Cascadia subduction zone will rupture with a magnitude 9+ event within the same time frame.
At around 9 p.m. on Jan. 26, 1700, the ground shook for one to two minutes, scientists estimate, when a massive rupture occurred along the Cascadia subduction zone.
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 large 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 ...
English: A scenario macroseismic intensity map of the median ground motion values from magnitude 9.0 scenario earthquake on the Cascadia Subduction Zone. Maximum intensity of IX (Violent). Affected areas include Northern California, western Oregon and Washington, and the Vancouver Island region of British Columbia.