It was well known that the soil drains sea water in excavations, but a seismic study shows that the amount…
It was well known that the soil drains sea water in excavations, but a seismic study shows that the amount of water that is extinguished is about three times more than previously thought. The phenomenon has major consequences for the global water cycle.
The results showed that the loss of sea water is due to slow collisions of tectonic plates under the Mariana Trench – deepest sea grave in the world. The Sagittarius is where the West Pacific sea slider slides under the Mariana plate and falls deep into the earth’s mantle when the plates slowly coincide.
“People knew that subduction zones could get water, but they did not know how much water,” said leading author Chen Cai of Washington University in St. Louis.
“This study shows that subduction zones touch much more water in the deep interior of the earth, many miles below the surface than previously thought,” added Candace Major, Program Director of the National Science Foundation’s Division of Ocean Science.
For the study, published in the journal Nature, the team listened to more than one year’s value of Earth’s rumblings ̵
1; from ambient sounds to actual earthquakes – using a network of 19 passive seismographic seabed utilized over Mariana Trench along with seven island-based seismogr aphs.
They found that sea water on top of the plate goes down into the earth’s crust and upper cloak along the lines that tip the area where the plates collide and bend. Then it will be caught.
Under certain temperature and pressure conditions chemical reactions force the water to get stuck in the rock in the geological plate as a non-liquid form – aqueous minerals.
Then the plate continues to creep ever deeper into the earth’s robe and bring the water with it.
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The seismic images show that the area of hydrated rock at Mariana Trench extends almost 20 miles or 32.2 km below the seabed, the study showed.
For Mariana Trench region alone, four times more water-subdues than previously estimated.
These properties can be extrapolated to predict the conditions of other ocean graves around the world. Scientists believe that most of the water that goes down in the shooter comes back from the ground to the atmosphere like water vapor when volcanoes blast hundreds of miles away.
However, with the revised estimates of water, the amount of water entering Earth seems to largely exceed the amount of water coming out, the researchers noted.
Tectonic plates can transport both continental crust and sea crosses. The latter is denser than the previous one and when these two collide, the sea cross (tighter) drops in the mantle under the sea cross (the lighter). This creates a subduction zone that digs.
The deepest excavation on earth is the Mariana excavation located in the Pacific Ocean and has a depth of 11,034 m.
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