A 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.
*This version of the Cascadia Playbook is a work in progress. Oregon’s Office of Emergency Management is committed to making this a useful document and welcomes suggested edits and recommendations to improve its functionality.