Sparvo, 40141 Bologna · 2019-04-19 · from the WORLDHUMMAP archive
A low hum in Sparvo, 40141 Bologna
A very low frequency but not at the same frequency of Ac distribuition, i'm think at about 70-74Hz, with some phasing change, and some change in volume. I have tried to record also with spectral analisys. The sound is present also in the blackout and this is very strange. The sound is very weak, and very difficult to record.
What they reported
First noticed: 2012
Pitch: I have already reported to a frequency of 70-74Hz
Loudest: Equal night and day
Where: Indoors
Symptoms: it's not annoying, but i'm curious, because i have heard it also with extended energy blackout
It is exactly like in this video (I found it after some days, after a research for the hum source, without knowing the existence of this recording)
https://www.youtube.com/watch?v=hPAt8bIxg…
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.
Anomaly