A future Cascadia earthquake could unleash far more than just devastating shaking — it could sink large parts of the Pacific Northwest coastline, dramatically expanding flood zones and leaving thousands more residents and buildings vulnerable to rising waters.

When an earthquake rips along the Cascadia Subduction Zone fault, much of the U.S. West Coast could shake violently for five minutes, and tsunami waves as tall as 100 feet could barrel toward shore. But that’s just the start of the expected horrors.

The next great earthquake isn't the only threat to the Pacific Northwest. A powerful earthquake, combined with rising sea levels, could significantly increase flood risks in the Pacific Northwest, impacting thousands of residents and properties in northern California,