Earthquake Hazard and Preparedness

Oregon is at significant risk of a major earthquake associated with the 600-mile Cascadia Subduction Zone Fault that runs off of the Pacific NW Coast from Cape Mendocino, California to southern British Columbia. Scientists have found evidence that at least 40 of these Cascadia Subduction Zone earthquakes have occurred during the past 10,000 years and determined that these earthquakes have occurred, on average, less than 300 years apart. We are now well within the period within which to experience another similar earthquake.


Here are links to several additional resources about earthquake hazard and preparedness:

  • The First Four Minutes – A Timeline of Portland’s Upcoming Cataclysmic Quake – The Portland Mercury, March 2012:
  • Oregon Resilience Plan – Oregon Seismic Safety Policy Advisory Commission, February 2013:
  • City of Portland, Earthquake Response Appendix, April 2012: