Eureka, California – Misconceptions about tsunamis can turn deadly along California’s coast, where waves can travel up to 600 mph and reach shore in as little as 10 to 20 minutes after a major offshore earthquake.
According to the National Weather Service in Eureka, one of the most dangerous myths is that tsunamis arrive as a single wave. In reality, they come in a series of surges that can last for hours, with later waves often stronger than the first to hit areas like Crescent City, Eureka, and Fort Bragg.
Another common belief is that there is always time to wait for an official warning. Along the North Coast, that assumption can be dangerous. A powerful Cascadia Subduction Zone earthquake could send waves inland quickly, leaving little time for alerts before impacts begin.
Some residents also assume tsunamis only affect certain locations, but all low-lying coastal areas, including Humboldt Bay and Del Norte County, remain at risk for rapid flooding and strong currents.
Officials stress that natural warning signs are critical. Strong shaking lasting more than 20 seconds or a sudden retreat of ocean water should trigger immediate evacuation to higher ground.
Preparedness is essential, as the next tsunami threat could develop rapidly with little notice along California’s coastline.
