Scientists have recorded mysterious "Ground hum" on the bottom of the ocean

We used to think about the Earth as something solid and static. But this is incorrect. The world is constantly vibrating, and we with him. The continuous noise of unknown origin sounds under our feet in inaccessible frequency. One researcher once described it as the sound of the transformer on an old TV, slow 10 000 times.

The hum everywhere. Previously it low frequency was registered in Antarctica and Algiers, and this week — at the bottom of the Indian ocean, announced the American geophysical Union.

No one knows exactly what causes it. According to some theories, is the echo of colliding ocean waves, according to others — movement of the atmosphere or vibration arising from the sea and the sky.

When in 2011, Japan suffered a major earthquake, the earth continued to vibrate for another month. The people on the other side of the world jumping up and down about a centimeter, but it happened so slowly that they didn't feel anything.

In 1998 a group of researchers analyzed data from the gravimeter in East Antarctica and realized that some of these vibrations never cease. The seismic waves ranged from 2 to 7 millihertz — a thousand times lower than the human hearing range, and continued indefinitely, regardless of earthquakes. This phenomenon became widely known as a "Ground hum".

Some scientists believed that the vibrations caused by the interaction between the atmosphere and solid ground. But according to Webb, the most recent studies show that the main reason is ocean waves — rumble on the seafloor does not subside throughout the Land. Sometimes the waves, splashing in opposite directions, intersect, sending vibrations deep in the earth's crust. Sometimes the wave in the shallow waters of the coast in some places. on a rough seabed and adds its own frequency.

Whatever it is, the result is the harmony ultra-low frequencies that are almost equally resonate across the globe.

Researchers already are studying how waves from earthquakes pass through the various depth areas to make detailed maps of the dungeon. But earthquakes are random and short-lived, like a flash of lightning in the dark night. Constant uniform vibration, according to them, could be the spotlight that illuminates the mysteries of the underworld.

Some researchers believe that the hum extends up to the Earth's core. There were even ideas to use sound vibrations on other planets to display their geography.

And yet we are still only beginning to understand this phenomenon. Scientists have been restricted for many years, so how could you measure it from the ground, while almost three quarters of the globe is under water.

In the new study, a team led by French researchers collected data from seismic stations installed in the Indian ocean near Madagascar some years ago. These stations were intended to explore the volcanic hot spot that has nothing to do with the drone. Scientists have developed a method of cleaning data from ocean currents, waves, and other noises.

They managed to reduce noise to about the same level as on the quiet ground station. And when they finished processing the data, they have the world's first underwater recording of rumble, which peaked between 2.9 and 4.5 milligram — a narrower range than in the 1990-ies.

The obtained results provide more evidence that the buzz is spreading worldwide. And scientists hope that one day they find out everything that happens in the depths of the earth.

Translated by «Yandex.Translator»