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Although the discovery does not support the Hollow Earth theory, it provides interesting information about the geology and history of the Earth.
A recently published study found that mountains larger than Mount Everest and rougher than Tibet were probably below the surface of the Earth.
Researchers from the Institute of Geodesy and Geophysics of China and Princeton University in the State of New Jersey, United States, used seismic wave data from A 1994 earthquake in Bolivia to examine a layer of rock located about 660 kilometers below the surface of the Earth. at Science Daily.
The team in charge of the study noted that a powerful and very powerful earthquake is needed for this type of research, and that the earthquake in Bolivia is the second most powerful earthquake ever recorded.
"You want a powerful, deep earthquake that will shake the entire planet," said Jessica Irving, Assistant Professor of Geoscience. According to Irving, the earthquake must be deep, a guy who "instead of wasting energy in the crust, can make the whole coat disappear," cited by Sciencedaily.com.
The rock layer, whose existence was known to seismologists, does not have an official name and is usually referred to as a 660 km or 410 km limit. To examine the limit, the researchers used the property of the waves to bounce and bend around the limits, writes Science Daily.
Just as people can see objects as they reflect and scatter light waves, seismic waves are reflected by subterranean inconsistencies. According to the researchers, homogeneous rock reaches are transparent to such waves – in the same way that glass is transparent to our eyes.
The study carried the 1994 data on the Princeton Tiger supercomputer group to simulate the complex behavior of scattering waves and was disrupted when the model revealed how rugged the ground is. Although the method does not allow for precise measurements, the researchers nevertheless believe that the underground anomalies have much larger dimensions than on the surface.
"In other words, a stronger border than the Rocky Mountains or the Appalachians is present at the 660 km limit," said research collaborator Wu Wenbo.
"They find that the deep layers of the Earth are as complicated as what we observe on the surface," said Christine Houser, seismologist, assistant professor at the Tokyo Institute of Technology and not having participated in it. study.
"Finding elevation changes of 1 to 3 km over a limit of more than 660 km using waves traveling the entire Earth and the return is an inspiring feat," said Houser.
The team's findings provide a better understanding of the structure of the Earth's mantle, writes Science Daily.
For years, scientists have debated the importance of the 660 km limit and its influence on thermal convection in our planet. Previous observations have suggested that both layers of the Earth's mantle are either chemically homogeneous or chemically dissimilar. New research findings can bring together these divergent observations and provide insight into the processes that led to the current state of the mantle.