Having grown up in CA. I am very used to earthquakes. They are very unsettling : ) and pretty scary for anyone that has not experienced one. We live in AZ now and I honestly thought my earthquakes days were over, but ... then a few years ago, I was sitting in my chair and it began to move, and it was an earthquake. The only thing was it was an earthquake in CA, that we felt all the way over here!
I guess the thing that really amazes me, is we can predict the tornados, hurricanes, etc, but there is really no way to predict an earthquake. Really no way to prepare for it, it just happens out of the blue.
I hope everyone is ok, and there was not alot of damage in OK due to this. Sometimes they can be very destructive as well.