[Ed. – Has everyone lost his mind? Earth’s axis is always shifting. It’s not like it’s even been static. I’m no expert, but I’d bet the extremely powerful forces exerted on Earth by the cosmos play as big a role in that as anything going on inside the planet. Where’s Hank “Guam may tip over” Johnson when we need him?]
New research suggests glacial melting due to global warming has caused shifts in the Earth’s axis of rotation since the 1990s.
The locations of the North and South poles are not fixed as factors such as ocean currents, molten rock inside the Earth and other factors contribute to the shift of the poles. How water is distributed on the surface of Earth is a factor that drives the shift.
Since 2002, researchers have been able to study the causes of polar drift thanks to data from the Gravity Recovery and Climate Experiment (GRACE) satellites and have linked glacial melting and groundwater pumping to movements of the poles since then.
But the new study published in Geophysical Research Letters aimed to explain changes in the poles that occurred during the ’90s, before the satellite data existed.