Cheers, I'm fine thanks, up here in Auckland we didn't feel a thing. But my parents live just outside Christchurch and they surely did. Pretty dramatic stuff. They were extremely lucky and got out of it lightly with just broken crockery and some bottles, but
other houses around them didn't fare so well, with several being condemned.
The sheer amount of damage buildings and infrastructure is staggering, just damn lucky the quake happened in the early hours and no one about, if it had been a weekday, the casualty count would be very different.
Here's a good read on the science with some interesting photos as well-
Tectonics of the M7 earthquake near Christchurch, New Zealand | Highly Allochthonous