I have a long glass pendulum set up in a windless spot (attached to to a solid part of the house structure - inside), with a backing piece of paper with a vertical line drawn up it. The pendulum has been moving in fits and starts since last nights quake.
Just checked it and it is still subtly swaying (up to 5mm, to left and/or right) every 20 seconds or so.
One of my dogs is still looking a bit jittery.
Got any pics of this setup? Would love to build something similar. Was going to try build something a bit more technical that would sound an alarm, just so I didn't happen to miss any aftershocks.
By the looks of that video RD posted, it was pretty intense. No way you could have missed that!