2020-07-04

Scientists discovered large mysterious and unknown areas inside the earth

By ddzyx

​The”tumor” that grows in the earth’s core is larger than expected.

getInterUrl?uicrIvZQ=a96c61f7f0f67a8b5fb7c4839fd4f15d - Scientists discovered large mysterious and unknown areas inside the earth

Doyeon Kim/University of Maryland

In the earth, at the junction of the mantle and the outer core, there are many huge mysterious areas attached to it like tumors. Scientists call it a”large low-speed shear zone”, meaning that seismic waves will slow down significantly when passing through them.

These mysterious areas can reduce the propagation speed of seismic waves by up to 30%, and the deceleration effect at the highest temperature on the edge of the area is also the most obvious. But people know very little about their nature, only that they are extremely large.

Two of the low-speed shear zones are located below the Pacific Ocean and Africa, with a mass almost equal to one tenth of that of the mantle. If they are on the surface of the earth, the height will be a hundred times that of Mount Everest.

According to a recent article in the”Science” magazine, their real volume may be larger than this.

The article revealed that the researchers used a new algorithm originally used to study stars to process the seismic wave data. As a result, at the edge of the original area, many new shear zones were discovered. One of the new shear zones in the South Pacific has a width of 1,000 kilometers, and the size of the shear zone below Xia Yiwei is also larger than originally thought.

Researchers believe that this indicates that the actual distribution range of the low-speed shear zone inside the earth may be wider than people think.

There may be a connection between the shear zone and the geological process. Lava plumes in the upper mantle may draw material from low-speed shear zones, and these plumes are the source of surface volcanoes.

But this is just a theory. What is the nature of the low-speed shear zone and what impact it will bring to the earth is still a mystery.

getInterUrl?uicrIvZQ=577d5e1ceaa0e835c7b640c8f0969aea - Scientists discovered large mysterious and unknown areas inside the earth

Doyeon Kim/University of Maryland

Refer to Scientists detect unexpected widespread structures near Earth&39;s core, eurekalert.org/pub_releases/2020-06/uom-sdu060520.php