Researchers claim that microseismic activity from long ocean waves impacting the sea bed is what makes our planet vibrate and produces the droning sound.
The pressure of the waves on the seafloor generates seismic waves that cause the Earth to oscillate, said Fabrice Ardhuin, a senior research scientist at Centre National de la Recherche Scientifique in France.
The continuous waves produce sounds lasting from 13 to 300 seconds. They can be heard by a relatively small proportion of people – who are sensitive to the hums – and also by seismic instruments.
“We have made a big step in explaining this mysterious signal and where it is coming from and what is the mechanism,”Ardhuin said of the study published in Geophysical Research Letters, a journal of the American Geophysical Union.
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