The Big One: A Northwest Earthquake Survival Guide | Portland Monthly

When the next Big One does happen, a 700-mile chunk of tectonic plate known as the Juan de Fuca, stretching from British Columbia to Northern California, will slide beneath the North American plate, causing the entire Northwest coastline to sink by up to 6.6 feet. The resulting quake won’t be a California-style short blast of energy along a fault line in the earth’s upper crustal zone. It will be bigger, deeper, and longer: 3–4 minutes, with potentially dozens of aftershocks, some very powerful, for days, even months, later. 

Read more....