Not sure how many of you have heard about it, but it was a 4.5 and it happened on Chicago. I looked at the dates and I noticed something. 1881, 1912, 1972, 2004

31, 60, 32

So I think that this is on a chain of events that adds 1 to the chain

i.e. 31, 60, 32, 61, 33, etc.

So, if I'm right, the next earthquake up here will be in 2065..

not sure many of you care, but I thought it was interesting.