ANU team discovers hidden layer within Earth’s inner core
Updated
Updated · SciTechDaily · Apr 25
ANU team discovers hidden layer within Earth’s inner core
15 articles · Updated · SciTechDaily · Apr 25
Researchers at the Australian National University identified a distinct zone about 650 kilometers across, buried inside the solid inner core, using advanced seismic data analysis.
This innermost inner core displays unique seismic wave behavior, suggesting a different alignment of iron crystals and possibly two separate cooling events in Earth’s history.
Independent studies using alternative seismic techniques have confirmed these findings, indicating the need to revise traditional models of Earth’s structure and offering new insights into the planet’s formation.
How will the discovery of a 'core within a core' change what we teach about our planet?
Is the core's newly found layer a key to understanding Earth's powerful magnetic field?
If Earth's core has a hidden fifth layer, what does this reveal about its violent birth?
Could a 'superionic' state, not a new layer, explain the mysteries at Earth's center?
Are other planets hiding similarly complex, multi-layered cores just like Earth?
Does the Earth's shifting, deforming inner core affect the length of our days?
Discovery of Earth's Fifth Layer: The Innermost Inner Core Revealed by Seismic Analysis
Overview
In early 2026, ANU scientists discovered a distinct innermost inner core, a metallic ball at Earth's center, overturning the traditional four-layer model by adding a fifth layer. This breakthrough was made possible by analyzing seismic waves from over 200 major earthquakes using advanced techniques and seismic arrays. The innermost core's unique seismic properties reveal it formed during an ancient cooling event influenced by lighter elements, preserving a frozen record of Earth's early history. This layered core structure drives the geodynamo, generating Earth's magnetic field that shields the planet and supports habitability. Recent observations of the inner core's slowing rotation suggest ongoing dynamic interactions affecting the magnetic field and Earth's day length.