An NOAA map (below) shows the red zone stretch about 130 miles from its southernmost point at Cape Mendocino near Fortuna, ...

Cascadia fault: A 600-mile earthquake risk under the US The Cascadia Subduction Zone (CSZ) is a 600-mile-long fault line that stretches from Northern California to Vancouver Island in Canada.

Science & Environment Cascadia earthquake tsunami threat may not be quite as bad as we thought (but it’s still bad) By Jes Burns (OPB) July 3, 2025 6 a.m.

But that's a false impression, because the tsunami is coming," he said. The resulting waves would be on the order of the 2004 Indian Ocean tsunami that killed nearly 230,000 people.