Unprepared: Will We Be Ready For The Megaquake In Oregon?How scientists know when the last big Cascadia earthquake happenedBy Tullan Spitz (OPB)Portland, Oregon Jan. 26, 2015 8 a.m.📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up