WOW!! They said on the news here last night that the ground in St. Louis moved 1/2 inch (amplitude) with the earthquake!
Even that is a lot of movement.
I was assuming that somebody had already conducted GPS-style surveys when I heard those numbers.
Reading through FR today, I see that the reports come from geologists using computer models and probabilities. I think I'll refrain from making any more similar comments until the facts are in.
On an related note, I read an FR post yesterday saying that our (UK/US) base at Diego Garcia escaped pretty much unscathed. That's good news!