The Cascadia Playbook (Version 3.0)Preparing for a Cascadia Subduction Zone earthquake and ensuing tsunami may seem like a daunting task, but each step we take to prepare helps make Oregon more resilient. The Cascadia Playbook is the blueprint for preparing for a large scale catastrophic event, but it also guides responses to other emergencies and incidents.
The Cascadia ThreatA Cascadia event is based on the threat of a catastrophic magnitude 9.0 Subduction Zone earthquake and resultant tsunami. Coastal counties will experience a devastating tsunami on top of severe ground shaking (up to five minutes). Shaking intensity will be less in the I-5 Corridor and Southern, Central, and Eastern Oregon, but older buildings may incur extended damage.
Expected Impacts• Ground shaking for 4-6 minutes causing massive critical infrastructure damage
• Liquefaction and landslides causing disruption of transportation routes
• Tsunami inundation to coastal areas with as little as 15 minutes warning
• Up to 25,000 fatalities resulting from combined effects of earthquakes and tsunami
• Tens of thousands of buildings and structures destroyed or damaged
• Tens of thousands of people in need of shelter because of destroyed or damaged households
• $30+ billion in economic loss
High Impact Areas:Curry, Coos, Douglas, Lane, Lincoln, Tillamook, and Clatsop counties
Mid-Range Impact Areas:Metropolitan areas including Washington, Multnomah, and Clackamas counties; counties west of the Cascades (Josephine, Jackson, Douglas, Lane, Linn, Benton, Marion, Polk, Yamhill, and Columbia)
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~*Ride the Wave*~