Matt sent us the following email about a “hum” he’s been hearing in Crown Hill:
I live up on the 105th and 9th and over the past couple of nights I’ve heard what sounds like a diesel engine idling in the distance. Its heard more inside than outside (probably due to the structure of the house) and mostly at night (probably because there’s less car noise/air noise to drown it out). My girlfriend is unable to hear it, but according to a few articles (here, here and here) that’s common.
I have a Masters in Physics and like to consider myself a vigilant skeptic, but I don’t hear this noise anywhere else (I have tinnitus from scuba diving and know the difference). According to what I’ve read, these things are extremely hard to track down due to its low frequency and most time’s it remains a ‘mystery’ (i.e. The Taos Hum). But it could be a simple answer like a new fan at the Carkeek sewage treatment plant or a railroad work crew clearing a mudslide, not sure.
Anyway, just curious if anyone in the neighborhoods heard it at well.