Earth Mystery: Scientists have discovered six mysterious structures hidden deep in the Earth that were never seen before. It is a different matter that all these things i.e. the deep layers of the planet are completely out of reach, but scientists can investigate these hidden depths by using seismic waves emanating from powerful earthquakes. Now Chinese scientists have discovered structures at the boundary between the thick mantle and the liquid outer core at a depth of 1,800 miles (2,900 km) beneath our feet. These deep-seated scatterers are almost invisible. What is interesting here is that they have a slight effect on the path of seismic waves passing through there.
These fragments change due to extreme pressure and extreme temperatures at the boundary of the mantle. After this they partially melt or undergo mineral transformation. Researchers also say that due to this, 6 'thermochemical piles' of material have been formed, which are completely different from the surrounding mantle.
In their paper published in the journal 'JGR Solid Earth', scientists say that these structures must have been formed when the material of the outer layers was pulled into the depths of the Earth. These may also contain pieces of continental crust or remains of 'Theia'. Theia was a Mars-sized protoplanet, from which the Moon is believed to have formed after colliding with Earth 4.5 billion years ago.
The earth seems quite stable
It has also been revealed that the Earth appears quite stable when seen from the surface, but there are movements and changes taking place deep inside the planet. Particularly at the boundaries between layers, a very special boundary is between the mantle and the outer core. Here solid but thick rocks are mixed with liquid nickel and iron. There is a huge difference in temperature on this range. There is a difference of about 1,000°C (1,800°F) between one layer and another. At the same time, the heavy heat emanating from the outer core creates convection currents in the mantle, which are called mantle plumes. Where on the surface would this volcanic activity occur? Play an important role in deciding this.
studied seismic waves
Due to the huge difference in density, seismic waves also slow down significantly at this boundary, allowing geologists to 'see' what is happening there. To learn more about this strange part of the planet, researchers studied a special type of seismic wave called PKP precursor. These are relatively weak waves that arrive just before the stronger seismic waves produced by an earthquake.
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PKP precursors are very useful to scientists because these waves are scattered by tiny differences in hidden structures (called heterogeneities) at the boundary of the mantle. To learn more about this strange part of the planet, researchers studied a special type of seismic wave called 'PKP precursor'. These weak waves arrive just before the strong waves generated by the earthquake.
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Earth's 4 main layers
Crust: The crust is the rocky outer layer where life exists. Its thickness ranges between 3 to 43 miles.
mental: The mantle is the largest layer of the Earth and is made of hot rocks. Its thickness is approximately 1,802 miles and it accounts for 84 percent of the total volume of our planet.
Outer Core: The outer core is approximately 1,367 miles thick and is composed of a layer of liquid nickel and iron, heated to 5,500°C (9,932°F).
Inner Core: The inner core is a hot and dense sphere of iron, about the size of the Moon and where temperatures reach 5,200°C (9,392°F).
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These scattered waves pass through the liquid outer core, but cannot pass through the solid inner core. These bounce back after colliding and reach the detectors measuring earthquakes before the main wave. The problem is that PKP precursors are very weak, so they are very difficult to detect in seismic data. These have to be searched manually among the thousands of signals collected every year. In their research paper, the researchers explain that manually identifying these precursors is inefficient, subjective and inadequate for large global seismic data sets.
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