All this does make me think of the 'Seattle Hum'
https://www.seattletimes.com/nation-world/have-you-heard-about-the-hum-of-the-earth/
The other place the Hum is heard in the US? well, remember that 'meteor' over Detroit?
https://www.seattletimes.com/nation-world/have-you-heard-about-the-hum-of-the-earth/
The other place the Hum is heard in the US? well, remember that 'meteor' over Detroit?