What a Modeled 9.0 Cascadia Earthquake Would Do to the West Coast

If the Cascadia Subduction Zone ruptures along its full seven-hundred-mile length, what would a modeled magnitude-9 Cascadia earthquake actually do to the West Coast? This documentary walks through real USGS scenario modeling, state hazard studies, and the 2016 Cascadia Rising exercise to answer that question honestly. The Pacific Northwest sits on a “locked” megathrust fault that last ruptured in 1700. Scientists can’t say when it will happen again, but they have spent decades modeling exactly what a full-margin rupture would mean for shaking, tsunami arrival, and recovery across Oregon and Washington. This is a modeled planning scenario built from published USGS, state, and FEMA hazard products, not a prediction of an actual event or a date. Every figure here comes from a dated, named source, and every “would” in this script describes a model’s output, not an observation. In this documentary, you’ll understand: • How USGS scientists built the M9 Cascadia ShakeMap scenario catalog • Why tsunami arrival time is measured in minutes, not hours, on this coast • What the 2016 Cascadia Rising exercise revealed about real response gaps • Why Portland’s Critical Energy Infrastructure Hub is a named point of concern • How building age, soil type, and distance change the modeled outcome • What “Be Two Weeks Ready” actually means, according to state recovery timelines Which named piece of Pacific Northwest infrastructure worries you most once you understand the modeling? Subscribe for more evidence-based breakdowns of real disaster science. Sources: USGS M9 Cascadia Earthquake Scenario Catalog (2018–2021); USGS Fact Sheet 2025-3050 (Sept. 19, 2025); Cascadia Rising 2016 After- Action Report (Sept. 6, 2016); Oregon Resilience Plan (Feb. 2013). #Cascadia #Earthquake #Tsunami #PacificNorthwest #DisasterPreparedness