Over the last few weeks, I've seen a few people on social media freak out about a weird unfamiliar noise overhead. From description it seems like a Skyquake -
https://en.m.wikipedia.org/wiki/Skyquake
I saw a few people independently report hearing it yesterday before 7am and again in the last hour. There was a recording being passed around Twitter about two weeks ago. Whatever it is, it's a real thing, it's just that the cause isn't understood. It could just be more noticeable without so many planes overhead.
Anybody heard it?