The study was conducted by the Northwestern geophysicist Steve Jacobsen and University of New Mexico seismologist Brandon Schmandt.
The study is the first to provide direct evidence that there may be water in the area of the mantle known as the transition zone – the layer between lower mantle and upper mantle.
The findings will aid scientists in understanding how the earth formed, what its current composition and inner workings are and how much water is trapped in mantle rock.
The discovery suggest water from the Earth’s surface can be driven to such great depths by plate tectonics which eventually caused partial melting of the rocks found deep in the mantle.
Scientists have long speculated that water is trapped in a rocky layer of the Earth’s mantle located between the lower mantle and upper mantle, at depths between 400 km and 660 km.