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The Hum is a generic name for a series of phenomena involving a persistent and invasive low-frequency humming noise not audible to all people. Hums have been reported in various geographical locations. In some cases a source has been located. Hums have been reported all over the world, especially in Europe. A Hum on the Big Island of Hawaii, typically related to volcanic action, is heard in locations dozens of miles apart. The local Hawaiians also say the Hum is most often heard by men. The Hum is most often described as sounding somewhat like a distant idling diesel engine. Typically the Hum is difficult to detect with microphones, and its source and nature are hard to localize.
Slow Down is a sound recorded on May 19, 1997, in the Equatorial Pacific ocean by the U.S. National Oceanic and Atmospheric Administration. The source of the sound remains unknown.
The Bloop is the name given to an ultra-low frequency underwater sound detected by the U.S. National Oceanic and Atmospheric Administration several times during the summer of 1997. The source of the sound remains unknown.
Quackers (from Russian: "квакер" -- onomatopoetic word based on a Russian rendition of frog's sound) are mysterious sounds, similar to a frog noise, widely reported by the crews of Soviet Navy submarines from various parts of the North Atlantic and Arctic Oceans during the peak of the Cold War, as well as their assumed sources. They are an example of Unidentified Submerged Objects.
One of the best documented examples of sound in relation to crop circles was reported by Colin Andrews and consisted of a number of short bursts of oscillating tones (or 'trilling' noises) recorded on audio tape. This was recorded during what was known as Operation White Crow, which took place in Hampshire during the summer of 1989.
Suddenly, we all heard a sound from the east. As we listened, it grew louder and we could sense it getting closer. It was definitely directional, in that we could all tell precisely where it was coming from, and we could follow it as it moved. The sound then rotated around us, floating around the circle three or four times, like an auditory cloud that passed above us in a circle. And again, it was directional: As it moved in its orbit around us, we could follow it with our ears, and if it had been visible, we all felt we would have been able to track it from point to point around the circle. First it was in our left ear, then behind us, then in our right ear.
Mayville Circle Produced Sound
Brad and I both noticed an unusual sound coming from within and around the crop circles. It sounded similar to crackling.
I put together a wav of this sound.
First is the original recording.
Now I slowed the recording down and notice it sounds like the pounding of a heart.
Should we maybe be also then concentrating on recording the noises coming from within the circle for coded messages?
sound slowed down
We found out later that ,since the early 1980's, sounds have been recorded in many of the Crop Circles . The frequency, generally is around 4 to 5 Hz. Noises have been recorded in both ultra and the infra sound part of the spectrum, varying from formation to formation, producing different musical notes.