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In February 2016, a high-pitched noise was heard intermittently at night in Forest Grove, Oregon. The Department of Forestry determined that their equipment was not the cause of the sound. [1] The news about the noise was first shared with Dave Nemeyer by a Forest Grove resident, who posted a video of it on the city's Facebook page. [2]
An unexplained high-pitched tone has kept residents of a Portland suburb awake at night for at least a week.
Garret Harkawiks' 2019 documentary film Doom Vibrations focused on Kohlhase's ten year journey to figure out what was causing the noise, and his theory behind it. [20] In all reported cases Kohlhase studied, he said that the locations were along high-pressure gas pipelines, or at least in close proximity to them. [19]
Electric traction motors often produce electromagnetically induced noise. This high-pitch noise depends on the speed and torque level of the machine, as well as the motor type. [5] Variable-frequency drives use pulse-width modulation, which introduces additional current harmonics and results in higher acoustic noise. The switching frequency of ...
Noise has been associated with important cardiovascular health problems, particularly hypertension, as it causes an increase in levels of stress hormones and vascular oxidative stress. [2] [20] [21] [22] Noise levels of 50 dB(A) or greater at night may increase the risk of myocardial infarction by chronically elevating cortisol production. [23 ...
Berkley. “My head thudded against the glass, heat pulsing through my blood from the point where his tongue was driving me mad. My leg flexed against his back, urging him closer, my hands cupping ...
Driving an RV at night? Here are some tips to keep you and your family safe while driving after dark.
The following is a list of unidentified, or formerly unidentified, sounds.All of the NOAA sound files in this article have been sped up by at least a factor of 16 to increase intelligibility by condensing them and raising the frequency from infrasound to a more audible and reproducible range.