If for some reason you've just landed in Portland from Mars, or have lived in a cannabis-infused state of ignorant bliss, Oregon is expecting the Big One. Within the next 50 years, there's a 22 to 26 percent minimum probability Portland will be hit by at least an 8.0 magnitude earthquake, the likes of which the region has not seen since Jan. 26, 1700, according to Oregon State University professor Chris Goldfinger. (That's a minimum probability in part because shallower fault lines lie in the West Hills, and no one knows when to expect a quake there.)