I did not know where you lived, one of the people who replied must have seen Butler in my information and got us confused.
Ohio, as glitter&guns mentioned, is mining country. I am linking ODNR just for you take a look at:
http://www.ohiodnr.com/mineral/subsidence/tabid/10427/Default.aspx.
This specific part of the ODNR site will show you Abandoned Mine Information that could be very informative as it relates to what is going on on the land you own:
http://www.dnr.state.oh.us/tabid/8101/Default.aspx
This is a map on Karstic Areas (it's older and I am sure there are possible changes, but it gives you some information):
http://www.dnr.state.oh.us/geosurvey/tabid/19292/Default.aspx
It wasn't a "bug" and I am not an alarmist ~ I have worked in the industry now for 14 years and have seen some unbelievable occurrences as it relates to ground control. With that being said, had you been away from the home after this storm & not putting this pool in, getting ready for the pour you might not have even detected the noise. It didn't work out like that and you are aware of it so I am directing you to the information the State of Ohio puts out there so landowners can begin to collect information if they feel so inclined to do so.
I realize you are going on with the pour and your PB has somewhat dismissed the issue. I am sure many other people excited about getting their pool area finished would do the same. Had I not been in the line of work I am in, I might also fall into that group "It was a noise, it's gone ~ pour the cement ~ we're ready to swim!" If it were me, I would seriously consider getting to the root of that noise before continuing. At this point you are feeling like there could be a possible risk with your pool deck, but what you heard could be an indication there are problems and should that be the case the deck really is going to be the least of your worries. It might not be a problem this weekend, next week, next month or next season for that fact, but if there would be an AML issue the problems will involve much more than your pool and deck area. If you go through with the pour today and down the road notice
any changes please don't ignore them. Please check all of your structures (home & outbuildings) for any changes, small cracks, fractures, etc. Be very vigilant. If you notice anything act upon it immediately.
Best of Luck and please keep us posted ~ I'll be anxious to see what everything looks like when finished.