built before anyone knew anything about says seismic risk >>> geologyists now understand the empty reinis at risk of a storm. >> two plates pushing against each other, one over the top of the other >>> the cascadia zone has produced giant earthquakes every 300 to 500 years. the last one was 315 years ago. should the big one hit, this man is the one who will be in charge of the federal government response. he knows scientists predict the next quake could be a monster magnitude 9. what is an earthquake at 9.0 or more look like? >> you don't know how long it will shake, what way the movement of the ground is going to move up or down, left or right or all the above, which can damage bridges, roads, tunnels, communications lines that are buried underground, natural gas, water lines you could have water systems fail so people don't have water to drink >>> here is a washington state department of transportation of a magnitude 7 earthquake with the especially center closer to down town seattle showing how vulnerable the city's infrastructure is. a cascadia earthquake could be a magnitude 9 or abo