Scientists Uncover Vast Ocean 700 Kilometers Beneath Earth's Crust, Holding More Water Than All Surface Oceans Combined

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Researchers at Northwestern University in Evanston, Illinois have made a groundbreaking discovery: a vast reservoir of water lying deep beneath the Earth's surface, approximately 700 kilometers below us. This hidden underground water source was uncovered during investigations into the origins of Earth's water. The findings were published in a 2014 study titled "Dehydration melting at the top of the lower mantle," where scientists detailed the identification of this colossal oceanic body hidden within the Earth's mantle.

The oceanic reservoir is encased within a type of blue rock called ringwoodite, located deep within the mantle, which is the layer of hot rock between the Earth's surface and its core. The sheer size of this reservoir has led to speculation that Earth's oceans might have gradually seeped out from the planet's interior. Remarkably, this subterranean water body is estimated to be three times the volume of all the oceans on the Earth's surface combined.

Steven Jacobsen, from Northwestern University, commented, "It's compelling evidence that the Earth's water originated from within." The discovery gained widespread attention when it resurfaced on social media platforms.

Jacobsen's team utilized 2000 seismometers to analyze seismic waves generated by over 500 earthquakes. These waves penetrate the Earth's interior, reaching the core and then being detectable at the surface. By measuring wave speeds at various depths, researchers were able to identify different types of rock. The presence of water became apparent as waves slowed down due to dampened rock.

Jacobsen emphasized the significance of this deep reservoir, stating, "We should be thankful for this deep reservoir. If it weren't there, it would be on the Earth's surface, and mountaintops would be the only visible land."

The findings from Jacobsen's team are supported by another study from 2014, where scientists from the University of Alberta in Edmonton, Canada, examined a diamond from the Earth's transition zone. This diamond, brought to the surface in a volcanic eruption, contained water-bearing ringwoodite.

The transition zone, situated between approximately 410 and 660 kilometers below the Earth's surface, marks the boundary between the upper and lower mantle. It is characterized by significant variations in temperature, pressure, and mineral composition.

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