A group of scientists suggests that the inner core of the Earth may have undergone a change in shape over the past 20 years.
Scientists believe the Earth's inner core is typically spherical in shape, yet its edges may be distorted, with some areas potentially raised by as much as 100 meters or more, according to the research conducted by Professor John Vidale.
The Earth's core is the vital core of our planet, generating a magnetic field that shields life from being destroyed by the Sun's intense radiation.
The inner core rotates independently from the liquid outer core and the rest of the planet. Without this movement, the Earth would cease to exist and become desolate like Mars, which lost its magnetic field billions of years ago.
The change in shape could be occurring at the boundary where the solid inner core meets the extremely hot liquid metal outer core.
The research is featured in the scientific journal Nature Geoscience. Initially, the scientists aimed to determine the reason behind the inner core slowing down relative to Earth's rotation, only to speed up again in 2010.
Understanding the Earth's core is crucial to understanding its magnetic field, which safeguards the planet, and whether that field could deteriorate or cease to exist.
Our planet's interior is an incredibly enigmatic region. The Earth's core is approximately 6,400 kilometers from the planet's surface, and despite significant scientific endeavors, researchers have yet to succeed in accessing it.
Scientists are attempting to uncover the mysteries of earthquakes by monitoring the shockwaves that travel through the Earth as they occur.
The way waves travel provides insight into the type of material they have passed through, including the inner core, and contributes to a picture of the hidden features beneath our feet.
The new analysis examined seismic wave patterns from earthquakes that occurred in the same location between 1991 and 2023. This helped to demonstrate the changes that take place in the inner core over time.
Dr. Vidale, a geophysicist at the University of Southern California, discovered additional evidence supporting the hypothesis that the Earth's inner core slowed down around 2010.
But his team also discovered the evidence of the inner core's varying shape.
It seems to be occurring at the boundary between the inner and outer core, where the inner core is near its melting point. The fluid movement of the outer core, as well as forces exerted by an irregular gravity field, may cause distortion.
Professor Hrvoje Tkalcic from the Australian National University, who was not involved in the study, stated that the paper presents "an intriguing concept that warrants further investigation".
He stated that it could enable scientists "to make more informed estimates of some crucial material properties, such as the viscosity of the Earth's core, which is one of the least understood quantities in modern science".
As time passes, the liquid outer core is gradually solidifying into the solid inner core, but this process will take billions of years to be fully completed.
It would essentially guarantee the extinction of life on Earth, but by that point, the planet would have already been engulfed by the Sun.
Professor Vidale's research is a part of ongoing investigations by global experts who are examining and debating the goings-on at the Earth's core.
We typically strive to examine phenomena thoroughly until we grasp their underlying principles.
It's likely that this discovery won't impact our daily routines in any way, but we still want to grasp the phenomena occurring beneath our feet.
It is possible that these changes are associated with variations in the Earth's magnetic field.
The magnetic field has exhibited irregularities over the past few decades, and we are interested in determining whether these past fluctuations are connected to what we are currently observing at the boundary of the inner core.
Professor Vidale warned against exaggerating the significance of the discovery, cautioning that the core's continued rotation is not likely to cease in the near future.
He also pointed out that there are many uncertainties remaining.
"We're not 100% certain that we're accurately interpreting these changes," noting that the boundaries of scientific knowledge are constantly evolving and, like many, if not all, researchers, he has been mistaken in the past.
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