Earth's geographical poles have shifted in rapid episodes

Researchers from the Center for Planetary Habitability at the University of Oslo have discovered evidence that Earth's geographical poles have shifted in distinct episodes over the last 320 million years. This phenomenon, known as “true polar wander,” involves the reorientation of the Earth's crust and mantle relative to its axis of rotation.

Unlike changes in the axial tilt or magnetic pole reversals, true polar wander occurs as the planet redistributes mass to maintain rotational stability. This mass redistribution is often driven by plate tectonics, which can create imbalances in continental crust between hemispheres. To compensate, the crust and mantle shift relative to the core.

By analyzing reconstructions of ancient continental flooding, scientists identified patterns in sea-level rises and falls that indicate these shifts can occur relatively quickly on a geological timescale. Such movements can transform the latitudinal position of entire regions, significantly altering regional climates.