In a groundbreaking discovery, scientists have found that Earth’s inner core may have changed shape over the past 20 years. This revelation challenges our previous understanding of the core’s structure and its role in the planet’s dynamics.
The Beating Heart of Our Planet
The inner core of Earth is often thought to be a solid sphere, but recent research suggests that its edges may have deformed by 100 meters or more in height in certain places1. This deformation could be occurring where the solid inner core meets the extremely hot liquid metal outer core. The inner core is crucial for generating Earth’s magnetic field, which protects life from the Sun’s harmful radiation. Without this magnetic field, Earth would resemble barren Mars, which lost its magnetic field billions of years ago.
Unraveling the Secrets of the Inner Core
The research, led by Prof. John Vidale from the University of Southern California, involved analyzing seismic wave patterns from earthquakes that occurred between 1991 and 2023. These patterns revealed that the inner core’s shape is not as solid as previously thought. Instead, it may undergo a process known as “viscous deformation,” where its shape changes and interacts with the outer core.
The scientists were initially trying to understand why the inner core’s rotation had slowed down before speeding up again in 2010. However, their findings have opened up new questions about the core’s structure and behavior. By studying the shockwaves caused by earthquakes, researchers can gain insights into the materials that make up the inner core and how it changes over time.
Implications for Earthquake Research
This discovery has significant implications for our understanding of earthquakes and the planet’s overall stability. The inner core’s shape-shifting behavior could influence the way seismic waves travel through the Earth, affecting how we predict and respond to earthquakes. As researchers continue to unlock the secrets of the inner core, we may gain a deeper understanding of the forces that shape our planet and protect life on Earth.
Read More: Earth’s inner core may have changed shape, say scientists
