Odivelas · 2019-08-18 · from the WORLDHUMMAP archive
A low hum in Odivelas
Very low frequency resonance Bening a muaician with sound mixing/recording skills, I can firmly say that the hum is not oeiginally a sound. It is a resonance, vibration, that propagates to your location and resonates with the materials (ex: house walls) around you creating the so called "hum. It's an extremely low frequency hat is created, that can only be captured by drums microphones specially designed to record the kick-drum. These microphones don't use a diaphragm but instead a piezoelectric material to convert physical resonances into sound.
What they reported
First noticed: 2018
Pitch: 37Hz
Loudest: During the night
Where: Indoors
Symptoms: Ear discomfort (pain, fullness, throbbing), Sense of vibration
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both described a low hum · on the other side of the country
Low frequency hum The hum is loudest inside the house but sounds like it is coming from outside. When I go outside it is still audible but less so with ambient noise and I cannot determine a…
the accounts read alike, found by meaning rather than by shared details
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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