What is real Theory of THE HUM (English version)

YOO guys, come with me again haha, why i wrote this article with english? of course ,this article was served for all people in the world, and i want to 'levelling' my english skill haha

so guys what is The Hum? Many people all over the world have heard about this sound.
 so many people thought that The Hum is signs of the apocalypse. Actually the signs of the apocalypse has been arround about 20 years ago.

And if people say it was a sangkakala, i dont think so. because what? If sangkakala had sounded. everybody would die.

So what is the real theory of the hum?

This is the possible explanation

Spontaneous otoacoustic emissions:

Human ears generate their own noises, called spontaneous otoacoustic emissions, which affects between 38 percent to 60 percent of people, although the majority are unaware of these sounds. The people who hear these sounds typically hear a faint buzzing or ringing, especially if they are otherwise in complete silence. However, these emissions occur with equal frequency across age groups within the population,[citation needed] and the Hum typically occurs in regional clusters and to older people. :575–576 Recordings of sounds that appear to be the Hum, such as that made in Auckland, would indicate that otoacoustic emissions cannot explain all occurrences of the Hum.

Colliding ocean waves:

On early June, 2008 an article published in Proceedings of the Royal Society announced the location of a “hum hotspot”, an “energetic source area stretching from the Labrador Sea to south of Iceland, where wind patterns are especially conducive to generating oppositely traveling waves of same period, and the ocean depth is favorable for efficient microseism generation through the ‘organ pipe’ resonance of the compression waves.” Researchers from the US Array Earth scope have tracked down a series of infrasonic humming noises produced by waves crashing together and thence into the ocean floor, off the North-West coast of the USA. Potentially, sound from these collisions could travel to many parts of the globe.

Mechanical devices:

In the case of Kokomo, Indiana, a city with heavy industries, the origin of the hum was thought to have been traced to two sources. The first was a pair of fans in a cooling tower at the local DaimlerChrysler casting plant emitting a 36 Hz tone. The second was an air compressor intake at the Haynes International plant emitting a 10 Hz tone. After those devices were corrected, however, the hum persisted.

this all from me,thx guys

source: https://moonconspiracy.wordpress.com