You would be forgiven for thinking that the planet that we live on is a solid and immovable object, but the truth is that the Earth is constantly moving and stretching, vibrating and shaking under our feet as it hurtles through the endlessness of space. Earthquakes are one example of just how active our planet is, one of the most mysterious things about the Earth is the fact that our planet has a sound, an endless hum that cannot be heard by human ears, the simplest way to describe what this hum sounds like is to slow down the sound of TV static by 10,000 times.

We are not clear about the cause behind this humming, all we know is that it is present all around the globe, researchers have recorded this ultralow frequency sound in various parts of the world and there are various theories out there that try to explain this sound. Some say it is caused by movements and vibrations in the atmosphere while others say that it is the sound of ocean waves colliding and echoing.

The fact that our planet is constantly ringing like a bell is quite fascinating, and researchers believe that if they can listen to this sound more clearly then they might be able to develop a better understanding of it as well. If the secrets behind this sound can be unravelled then we might be able to learn more about what goes on inside of our planet and we might even be able to use this sound to map alien planets.

Another peculiar thing about this humming is the fact that its frequency is not consistent, it changes along with the Earth’s vibration levels, for example when the 2011 earthquake shook Japan, the Earth rang like crazy for an entire month. Researchers reported that people all across the globe went up and down by an entire centimetre, but since it happened so slowly they hardly felt a thing. The Earth’s vibrations seems to have a direct impact on this humming, but that does not mean that they are caused by these vibrations, the humming is always there even when seismic activity is quite low.

Recent research suggests that the most likely culprit for these waves are ocean waves that are always clashing with the earth’s surface, sending vibrations deep into the planet’s crust. Vibrations and disruptions at various levels and frequencies all over the world come together to create a harmony of ultralow frequencies that resonate all across the globe with astonishing matching. Researchers are confident that this first step towards identifying this hum will be crucial in looking at this sound as more of an understandable signal rather than a mysterious sound.

Understanding this humming can be a monumental step towards developing a reliable way of mapping our planet’s bowels, scientists already make use of earthquake waves to study the planet’s interior, however, earthquakes are far too random to base an entire study on them.