Imagine two colossal mountains, each with a height of over 1000 kilometers – 100 times higher than Mount Everest – but completely invisible to the human eye, because they lie deeply buried under our feet.
This amazing discovery comes from the research team on the Utrecht University within the Netherlands and was published in The Scientific Journal Nature. Hidden 2000 kilometers below the Earth’s surface-the law under the Pacific Ocean, near the Indonesian archipelago-identified two mysterious “Mega-Mountain” deep within the earth’s coat.
These structures are often called Large low seismic speed provinces (LLSVP)– Regions by which seismic waves travel much slower than in the encircling coat.
But this discovery isn’t only a size. LLSVP isn’t only much larger and warmer than the coat surrounding regions – also they are much older. Scientists estimate that these structures could create over 4 billion years, longer than most alleged geological formations.
What are LLSVPS?
LLSVP are extensive regions within the lower coat, first detected at the tip of the twentieth century by analyzing seismic waves from large earthquakes. They are positioned under the Pacific Ocean and Africa, regions near the Indonesian archipelago. When seismic waves move through these areas, they drastically decelerate – hence the name “low shear speed”.
However, recent findings have revealed that not only speed is changing. Analyzing the quantity of energy lost by seismic waves – called damping—Theesemen gain latest information concerning the internal structure of the Earth.
The secret of ancient islands on Earth
For a long time, scientists believed that the earth coat is a dynamic system by which the recent material rises and cooler material is drowning in a continuous cycle. But this latest study questions this view. The Utrecht team said that these two “hidden islands” within the coat seem extremely stable and have modified little or no since their formation.
LLSVP was first detected by analyzing seismic waves from the principal earthquakes. When the earthquake occurs, the earth vibrates like an enormous bell. These vibrations are propagated as waves, and the best way they travel allows scientists to take a look at what’s deep in our planet.
In LLSVP regions, these waves move slower – the indication that the fabric is hotter and compositional.
The most surprising, in keeping with the researcher of Sujania Talavera-Soso, is that the waves didn’t suppress significantly once they go through LLSVP-like to nearby regions that act like a “cemetery of tectonic plates” and strongly absorb seismic energy.
This implies that despite the incontrovertible fact that they’re warmer, LLSVP doesn’t suppress seismic waves, as previously assumed.
What causes this phenomenon?
To understand why seismic waves behave strangely in these regions, scientists examined the microscopic LLSVPS structure. It seems that the important thing factor is the dimensions of the mineral grain.
In areas where tectonic plates sank in a coat, cold material recrystallizes in positive -grained structures. When seismic waves move through these regions, their energy is absorbed since the waves must go through quite a few grain boundaries. That is why seismic energy quickly decreases in these areas.
In contrast, LLSVP consists of much larger grains, enabling the passage of seismic waves without losing a considerable amount of energy. And because these large beans grow extremely slowly, he suggests that LLSVP structures are extremely ancient – maybe even older than the continental shell itself.
How is the earth’s core shapes us
The existence of those two “Mega-Montin” can fundamentally transform the best way we understand the geological evolution of the Earth. It is believed that LLSVP is the points of the origin of mantle plumes – columns of hot material that grow towards the surface and volcanic liberating activities, comparable to what is occurring in Hawaii.
In other words, these ancient structures could be hidden aspects behind the principal geological events on the earth’s surface. These are “engines”, driving mountains, volcanic eruptions and movement of tectonic plates.
The invisible world below
This study not only opens a brand new insight into the interior structure of the earth, but additionally emphasizes what number of secrets stays hidden under our feet. Although these features can’t be dug up or directly examined, seismic technology still provides useful recommendations on this exotic underground world.
From 1975, seismographs have recorded 1000’s of high -quality earthquakes. One of essentially the most significant was the earthquake in Bolivia in 1994, which took place at a depth of 650 kilometers – deep to cause damage to the surface, but ideal for sending seismic waves wavy throughout the planet.
Thanks to the increasingly advanced technology, scientists hope to find much more hidden structures and get a deeper understanding of the planet’s origin, which we call home.
