Scientists record eerie noise from deep inside the earth
11 December 2017
Scientists have captured a noise from deep inside the earth, but they have no idea of its origin,
It is a low, ceaseless droning which has no clear origin, but it rolls imperceptibly beneath our feet, and is not audible to human ears. It was once described by a scientist to HuffPost as the sound of static on an old TV, slowed down 10,000 times.
According to experts, earth is not solid and immovable as popular perception would have it but is vibrating, stretching and compressing. And everything on the earth is shaking right along with it.
''The earth is ringing like a bell all the time,'' said Spahr Webb, a seismologist at Columbia University, The Washington Post reported.
The ultra-low frequencies of the hum have been recorded everywhere, in Antarctica and Algeria, and as announced this week by the American Geophysical Union, on the floor of the Indian Ocean. Scientists still do not know what causes it, but some have theorised that it is the echo of colliding ocean waves, or the movements of the atmosphere, or vibrations born of sea and sky alike.
According to scientists if we could hear this music more clearly, it could reveal deep secrets about the earth beneath us, or even teach us to map out alien planets.
Scientists have been trying to record the elusive sound since 1959, however, it was not until 1998 that its existence was finally proved.
Researchers have now captured the hum for the first time using seismic instruments at the bottom of the ocean.
They first collected data from 57 seismometer stations in the Indian Ocean, between 2012 and 2013 and then applied a combination of techniques to remove interference from ocean infragravity waves, currents and electronic glitches, and corrected for the signal generated by any earthquakes.