Groundwater Depletion Shifted Earth’s Rotational Pole 31.5 Inches, Adding 6.24 Millimeters to Sea Levels
Updated
Updated · Popular Mechanics · Jun 4
Groundwater Depletion Shifted Earth’s Rotational Pole 31.5 Inches, Adding 6.24 Millimeters to Sea Levels
3 articles · Updated · Popular Mechanics · Jun 4
Summary
A 2023 study estimated that pumping 2,150 gigatons of groundwater from 1993 to 2010 moved Earth’s rotational pole by about 31.5 inches, a measurable change in the planet’s wobble.
Researchers found their polar-motion model matched observed drift much better when that groundwater loss was included, tying irrigation and human water use to the shift as water ultimately reached the oceans.
The same depletion contributed about 6.24 millimeters of global sea-level rise, and the study identified heavy losses in western North America and northwestern India as especially influential.
Newer 2026 research still points to terrestrial water storage as important for polar motion, though some models rank snow storage changes and Greenland melt above groundwater in the longer-term trend.
The findings add to evidence that groundwater loss also worsens land subsidence and coastal risk, even as some 2026 reviews show aquifers can recover with alternative supplies, artificial recharge and policy changes.
Can the world's most critical aquifers be saved before their depletion leads to widespread food shortages?
With human activity now tilting the planet’s axis, what unseen global consequences could be triggered next?
Since local water use impacts global GPS, should massive extraction be regulated like an international utility?
Human-Driven Groundwater Loss Is Shifting Earth’s Rotational Axis: Causes, Consequences, and Solutions
Overview
Recent research has revealed that human activities, especially the massive redistribution of groundwater, have significantly shifted Earth's rotational axis between 1993 and 2010. Scientists found that when large masses, like groundwater, move across the planet’s surface, they cause small but measurable changes in the tilt of Earth's axis. By comparing models with and without groundwater movement, researchers showed that human-driven water management is now a major force altering the planet’s rotation. This discovery highlights how our actions can influence fundamental planetary systems, extending human impact beyond climate change to the very mechanics of Earth itself.