Article #97 The Big One: The Cascadia Subduction Zone and the Pacific Northwest Earthquake


This world map created by NASA shows the techtonic plates underneath the planet’s ocean. (Photo Credit: NASA Scientific Visualization Studio)

The Cascadia Subduction Zone is the main region in the Pacific Northwest of North America that has had several major earthquakes over the past several hundred years. The last major earthquake took place on January 26th, 1700 with an
estimated moment magnitude of 8.7–9.2.
This diagram of a subduction zones helps us understand how specific types of earthquakes work. (Image Credit: K. D. Schroeder via Wikimedia Commons)