answer:Naturally the lower you are the more likely you are going to be crushed. In the 1989 San Francisco quake, many houses “pancaked” into the street. Meaning the top floor crushed the lower floor as the whole building fell into the street. With 20 floors, I think it just all comes down to dumb luck. It doesn’t hurt to try and position yourself in something structurally sound, like a bathtub or doorway in the hopes that when everything comes toppling down, you’ll have some sort or frame around you to prevent you from being crushed.