Cascadia

A particularly chilling prospect for Northern California, as well as Oregon and Washington, would be a magnitude 9 earthquake along the Cascadia subduction zone off the coast.

A nightmare scenario for Northern California, as well as Oregon and Washington, would be a magnitude 9 earthquake along the Cascadia subduction zone off the coast.

And there was the catastrophic mega-tsunami of 1700, originating from a magnitude 9 earthquake over the Cascadia fault system, which runs offshore from Northern California to Vancouver Island for 700 miles.

The upgrade also would improve warnings for the Pacific Northwest and California’s North Coast, which are threatened by tsunamis from quakes along the Cascadia subduction zone.

In their last MLS match, the Sounders conceded late to draw against Cascadia rival Vancouver at Lumen Field.