The Seattle fault last ruptured about 1,100 years ago in AD 900–950. The compact sediments in an area called the Cascadia subduction zone offshore the Pacific Northwest increase the likelihood of major earthquakes and tsunamis. The Seattle fault. The Cascadia subduction zone last ruptured over 300 years ago on January 26, 1700. The Cascadia subduction zone. CORVALLIS, Ore. - A comprehensive analysis of the Cascadia Subduction Zone off the Pacific Northwest coast confirms that the region has had numerous earthquakes over the past 10,000 years, and suggests that the southern Oregon coast may be most vulnerable based on recurrence frequency. The average time between large earthquakes is about 535 years, but has been as little as 200 years, and more than 1,000 years. The Cascadia Subduction Zone (CSZ) "megathrust" fault is a 1,000 km long dipping fault that stretches from Northern Vancouver Island to Cape Mendocino California. Written by researchers at Oregon State University, and published online by the U.S. The Cascadia subduction zone remained hidden from us for so long because we could not see deep enough into the past. New Juan de Fuca plate is created offshore along the Juan de Fuca ridge. It separates the Juan de Fuca and North America plates. Cascadia Subduction Zone Earthquake Scenario This scenario characterizes the effects of a major subduction earthquake on communities along the Cascadia Subduction Zone, stretching from the Brooks Peninsula on Vancouver Island to Cape Mendocino in northern California. Shallow Earthquakes The shallow earthquakes scenario discusses the effects of earthquakes that occur within the earth's … A University of Washington research project, to be presented Oct. 24 at the Geological Society of America’s annual meeting in Seattle, simulates 50 different ways that a magnitude-9.0 earthquake on the Cascadia subduction zone could unfold. Cascadia Megaquake Risk Higher Right Now - Across Washington, WA - Every 14 months, a long, slow earthquake happens under Puget Sound, putting stress on the Cascadia subduction zone.

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