This is very interesting! Just glanced so far, will read through it more carefully again.
Just some stray ideas for those interested - the US Continental Divide runs right through the West Side of Chicago.
Here's some info and there's plenty more to be found.
Oak Park Continental Divide Page
Every time there is an earthquake in the Midwest, I want to go where this is and see if anything is "sticking up"
(This is not far from me, but I am east of it, so I guess I am in the GL Watershed.)
Another bit of info I came across somewhere - The Salt Lake in Salt Lake City Utah is somehow connected to the Great Lakes. Was formed by the same
system? I am not sure of the particulars of this.
One last thought - I *know* Fermilab (Far Western Chi burbs) maintains a seismograph, but I can never find this info on their website. Unless they no
longer do this? Or maybe I'm not looking in the right spot. Something others might want to pursue also.
This reminds of this: I was told by an older person, who came from OH and worked in the auto industry in the 50s - OK somewhere in OH was a factory
stamping the big old heavy car bumpers, huge heavy slow press, and these "hits" of the press were picked up on the seismographs at Fermilab. They
figured out what it was due to the regularity of it. But think of it - such industrial activity shaking the ground like that, picked up states
It makes you wonder - what has all the heavy industry, as well as high rise architecture / all those pile drivers sinking caissons far below into
bedrock in multiple Great Lakes cities - what has *this* activity contributed to geologic changes?
OK, going back to read more carefully now, apologies if any of the above has already been mentioned
Again, Redneck, excellent topic