Thanks for that fascinating link.
My husband and I slept through the aftershock early this morning, but our daughter felt it, as she had just laid down to go to sleep.
She thought one of the cats had jumped on her bed, but when she looked, she didn’t see any of them. She heard something fall in her room, and got up and looked to see which cat was to blame. There was no cat to be found, and after being slightly freaked out for a minute or so, she went to sleep.
I guess we now know that a cat, jumping onto the bed, is approximately the same as a 4.0 quake.
The whole website is very interesting.
The main page is here...
http://showme.net/~fkeller/quake/index.htm