Seismic waves and wet rocks

Why is this intuition? Because ringwoodite is nothing other than olivine - the main mineral of the mantle - subject to conditions of high temperature and pressure such as those exerted between about 520 and 660 km depth in toward the center of the Earth, in a kind of transition zone between the upper mantle and the lower mantle of the planet. However, the remarkable feature of this ringwoodite is that it tends naturally to trap water in it, not as a liquid, gas or ice, but in the form of hydroxide ions. Moreover, after analysis of their precious sample, the researchers confirmed that it contained well about 1.5% water. In other words, although this percentage may in no circumstances be generalized, firstly it showed that there was indeed somewhere in the ringwoodite in the Earth's mantle and, second, that it could contain a significant amount of water. The hypothesis of a huge water reservoir in the Earth's mantle so out considerably strengthened ...

Seismic waves and wet rocks
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With this result, another team of American researchers led by Steven Jacobsen, Northwestern University in Illinois and Brandon Schmandt of the University of New Mexico, tried to turn light on the question by studying the behavior of seismic waves that ring the Earth like a bell for several days after an earthquake. For when these waves encounter wet rocks, they slow, and this is something that scientists know how to measure. But what with the trapped water in ringwoodite since it is not in liquid form? Is that, through experiments conducted in the laboratory, Steven Jacobsen previously managed to show that under conditions of pressure and temperature comparable to those exerted on the boundary between the transition zone and the lower mantle Earth, the famous rock is forced to return all of its water.

So that's about 700 kilometers deep, which would lie what could be the largest water reservoir in the world. And, after a careful analysis of the data collected by EarthScope USArray - a network of 2,000 seismographs spread on the floor of the United States - when 500 earthquakes, researchers believe. The records seem to corroborate this idea ( article published in the journal Science ). Through this research, scientists now hope to gain a better understanding of the water cycle on our planet, but also how the oceans were formed. All the water on Earth, so necessary for life might not only come from comets