740 10 Uppsala Sweden · 2018-03-21 · from the WORLDHUMMAP archive
A distant airplane engine that comes in waves over a period of hours during the night. Or a very low vibration which is extremely difficult to tolerate. Stepping outside, the sound stops. There is no way to stop the sound by way of ear plugs. The low vibration incident was isolated and was in M�rsta. The engine like vibrations are in the 740 10 region near Uppsala and occur from time to time. They are not airplanes as the sound disappears when you step outside the door.
What they reported
First noticed: 2004
Pitch: 120 hertz sawtooth
Loudest: During the night
Where: Indoors
Symptoms: Sense of vibration, Anxiety
Changes with weather: I am not sure.
Low frequency distant vibration, resembling plane engine or purring of a cat. The sound (a humming vibration) is not constant, it comes and goes. It is not a linear/constant sound, it is sli…
the accounts read alike, found by meaning rather than by shared details
Low hum. Continuous. Some oscillation in loudness. Some breaks in the sound for a second or so occasionally. At night, although today for the first time I continued to lie in bed and follow …
the accounts read alike, found by meaning rather than by shared details
Sounds like a distant engine, a low frequency sine sound wave. It is not constant, however. It comes and goes. But it does not sound like it comes from outside, because it is more like a vib…
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