Earth's Inner Core May Have Changed Shape: Seismic Waves Reveal a Twist

New research using seismic wave data suggests Earth's solid inner core may have altered its shape over the past two decades. Analyzing seismic waves from 128 earthquakes off South America (1991-2023), researchers found discrepancies between waves passing through the core and those that didn't. This indicates a change beyond just rotational speed. The change could stem from magnetic forces in the outer core's convection acting on the inner core's less viscous edge, or interactions between the inner core and the lower mantle. However, other factors like outer core changes, inner core convection, or molten material eruptions remain possible explanations. This study offers a new perspective on understanding the Earth's deep interior evolution, but further research is needed for confirmation.