"Is there any fracking going on in your area?" Having lived around the petro-chemical industry most of my life, I've heard all manner of sounds and noises from them. The other possibility is noise from a pipeline, either from cleaning it ("pigging"
or they're hydro-testing a new one.
Here's some information on the pipeline possibility: http://www.science-frontiers.com/sf068/sf068g13.htm
From that same site, is a search I did on "hums" which can include loud mechanical noises:
http://www.science-frontiers.com/online/search.cgi?zoom_query=hum&zoom_per_page=50&zoom_and=1&zoom_sort=0
While I do believe UFO and such activity is worthy of study, I tend to rationalize unusual sounds and sights first. The weirdest sound I've ever heard came during the full force of Hurricane Ike. The wind was making noise all by itself, without needing a structure to vibrate. Of course, it was also going an estimated 135 mph a hundred feet off the ground
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