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A point in the middle of the Indian Ocean has left geologists scratching their heads since it was discovered in 1948. It is the largest anomaly on Earth, an oceanic crater 105 meters below sea level, covering more than three million square kilometers. Named “Indian Ocean Geoid Low” or “Indian Gravitational Hole”, the phenomenon remains one of the greatest geological mysteries on the planet.
The story of this gigantic depression began with Dutch geophysicist Felix Andries Vening Meinesz, who identified it while studying geological properties aboard a ship. Since then, the largest anomaly on Earth has intrigued specialists, leading teams around the world to seek answers about its origins.
Mystery With Deep Roots
Scientists from the Indian Institute of Science in Bengaluru decided to use artificial intelligence and geological simulations to understand how this oceanic crater formed. The results, published in Geophysical Research Letters, suggest that the origin of the phenomenon is related to the disappearance of an ancient ocean called Tethys, which existed between the continents of Gondwana and Laurasia during the Mesozoic era, over 140 million years ago.
“Back then, the Earth was completely different”, explains Attreyee Ghosh, one of the study’s authors. “The oceans were in different places, and the planet’s density structure was also different.”
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The researchers conducted 19 computational simulations that trace the movement of tectonic plates and the behavior of magma in the Earth’s mantle, creating a detailed picture of the planet in the distant past. The investigation revealed that “magma plumes”, driven by the interaction between the mantle and oceanic plates, played a crucial role in the formation of the gravitational hole.
How Tethys Shaped The Largest Anomaly On Earth
When the ancient ocean Tethys disappeared, the Indian subcontinent was moving north, separating from Gondwana and colliding with Asia. During this process, the oceanic plates of Tethys were pushed into the Earth’s mantle, creating the conditions for the emergence of the largest anomaly on Earth. The resulting “plumes” brought less dense materials to the surface, causing the gravitational depression.
This phenomenon is deeply linked to the movement of tectonic plates and the geological cycles of the Earth. According to scientists, new tectonic shifts in the future could make the anomaly completely disappear, but this will take hundreds of millions of years.
The Fascination Continues
Despite decades of research, the largest anomaly on Earth remains an intriguing challenge for science. The combination of technological advancements, such as artificial intelligence, with field studies has allowed scientists to make progress in understanding this gigantic geological mystery.
While the future of the anomaly remains uncertain, one thing is clear: the oceanic crater of the Indian Ocean holds secrets about the planet’s deep history that are gradually being unveiled.
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