Seattle Times reporter Sandi Doughton tells about scientists working to understand the way the earth moves and describes what patterns can be identified and how prepared (or not) people are. -- Scientists have identified Seattle, Portland, and Vancouver as the urban centers of what will be the biggest earthquake, also called a mega-quake, in the continental United States. A quake will happen -- in fact it's overdue. When, where and just how big will The Big One be? -- Doughton has covered Los Alamos National Laboratory and its programs in nuclear weapons, Star Wars anti-ballistic missile systems, laser fusion, and basic physics. She has written about the environment, health, and medicine at newspapers in Santa Fe and Tacoma, and currently writes about science for The Seattle Times.