Mystery about the sound from the sea has baffled people around the world for decades

News24xx.com - The strange humming has puzzled people around the world for decades that happen at sea. The low-frequency sounds have been known for almost half a century - but the source remains a mystery.

Scientists claim that his voice is not heard for humans, but thousands still insist that they have heard it. A website, called 'Hum', has a report on the noise that has occurred since the 1960s. Theories about what causes it range from fish mating, secret projects to tunnels beneath the Earth and the presence of aliens.

Now, by measuring sound using underwater seismometers positioned around the world, scientists may finally be able to figure out what it is.

It is unclear what caused the buzz, but scientists say that this may be the result of a tiny vibration on Earth called 'free oscillations' that can only be picked up by sensitive equipment.

The vibrations are triggered by the very small expansion and contraction of our planet, though scientists still do not understand the source. Earthquakes have been known to cause the Earth to emit the same vibrations for a long time, but the buzz only occurs when there is no seismic activity.

The first attempt to detect the hum was made in 1959, but it was not until 1998 that scientists had conclusive proof that it existed.

Many reverberations have been taken since then from ground-based seismometers.

And many people have reported hearing it on the Hum Hum website, although scientists claim it is not possible.

MacPherson says: "The classic description is that it sounds like a truck stops outside your house.For some, this is a deep and distant hum bass tone Some people feel the sound as a rumble The sound inside the room is louder than it is outside home.Suddenly can appear or disappear for days or months.People of all ages can be affected, even though the incidence among children is very low.In more serious cases, Hum can affect the quality of life of the community. a number of documented cases, the noise torture has changed lives. "

Experts at the French Institute of Physics Paris have recorded a humming sound from the bottom of the ocean.

This was previously not possible because the seismometer measures movement, which means tidal disturbances obscure the tiny signal readings.
The team studied the 11-month observation of 57 seismometer stations on the ocean floor in the Indian Ocean east of Madagascar.

They chose two stations with the highest quality readings and painstakingly released any disturbance from the data.

With what cross reference is left with the measurements from the terrestrial station, the team realizes that the remaining signal is a hum. The researchers found that the noise was almost 10,000 times below the 20 hertz threshold of human hearing. Experts have previously suggested that humming is caused by continuous waves on the seafloor, or by currents floating on the continental shelf.

Other studies have shown that the noise is the result of atmospheric turbulence, as it is stronger in the Pacific Ocean in the northern hemisphere during the northern winter, and southern oceans during the southern hemisphere winter. The researchers found that the buzzing amplitudes did not match the seasonal changes, which means atmospheric turbulence can only explain the sound partially.

'The buzz of the earth is permanently Earth-free oscillations recorded in the absence of an earthquake,' a team led by Dr Martha Deen, writes.


Researchers say studying the drone through a seafloor seismometer can help determine its origin, especially if a current or wave is responsible. They also said their technique could help map the earth's interior, which is usually done using sporadic seismic data from earthquakes.

News24xx.com/dev/red