It’s very possible. There’s another source of noise that I’ve noticed, it’s qualitatively different so I don’t think it’s related, but there is a life flight helicopter pad about 2 miles from me. Every now and then there will be a real low rumble in the house that you can actually feel more than hear. About a minute later the helicopter will fly overhead.

There is an auto assembly plant about 5 miles away, if it’s not in my head it’s almost certainly something from there. The ground here has a extremely high clay content, and when you get down a bit it’s like one solid mass. It seems ideal for transmitting sound long distances.