Researchers have recorded a noise coming from within our planet using instruments placed on the ocean floor. Scientists are convinced that the new findings could be used to map the interior of the Earth in more detail and precision.

Using seismic instruments placed on the ocean floor, researchers have successfully quantified Earth’s vibrating “buzz.”

No, it’s not aliens, it’s not an alien base, nor is there an alien spaceship at the bottom of our oceans.

An illustration of the internal composition of our planet. Image Credit: Shutterstock.

Scientists have known for some time that earthquakes can cause the Earth to vibrate for long periods of time.

However, in 1998 a team of scientists discovered that the Earth also constantly generates a low-frequency vibrational signal in the absence of earthquakes.

Since then, seismologists have proposed different theories to explain the existence of this continuous vibration, from atmospheric disturbances to ocean waves that move on the bottom of the sea.

They also measured the vibration using seismometers on the ground but had not yet measured it successfully at the bottom of the sea, which could help scientists better quantify sources of vibrations.

Now, using seismic instruments strategically placed on the ocean floor, researchers have managed to successfully quantify Earth’s vibrating “buzz.”

A new study published in Geophysical Research Letters, a journal of the American Geophysical Union, explains how experts managed to detect the frequencies to which the Earth vibrates naturally, and confirms the feasibility of using oceanic instruments to study the Earth’s buzz.

Capturing the buzz on the ocean floor could provide new insights into the magnitude of the source, according to Martha Deen, a geophysicist at the Institute of Earth Physics in Paris, France, and lead author of the new study.

In addition, the new findings could be used to map the interior of the Earth in more detail and precision.

Studying the buzzing of seismometers at the bottom of the ocean may give a better overall picture than using only ground-based seismometers by increasing the coverage of data in large uncovered areas, said Deen.

“The Earth is constantly moving, and we wanted to observe these movements because we could benefit from having more data,” Deen explained.

The new research examined the permanent free oscillations of the Earth: low-frequency seismic signals that can only be measured with sensitive instruments. The vibration caused by these signals is constantly present in the ground and is observable in the absence of earthquakes.

Source: https://blogs.agu.org/geospace/2017/12/06/scientists-capture-earths-hum-on-ocean-floor/


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