In brief
A new study using fiber-optic technology has revealed insights into the movement of Greenland's ice sheets, indicating that hidden seismic activities termed "ice quakes" significantly influence glacier dynamics.
In a remarkable study conducted in Greenland, scientists have unveiled a surprising method of glacier movement. Using a fiber-optic cable, researchers led by Andreas Fichtner, a seismology professor at ETH Zurich, embarked on investigating the deep layers of the ice sheet. Initially skeptical when the cable returned data in August 2022, Fichtner was taken aback by what they found. These measurements captured minute vibrations known as "ice quakes," which resonated throughout the ice. The findings challenge existing theories about how ice sheets, particularly in Greenland and Antarctica, progress and contribute to global sea levels. The ice quakes appear to originate from impurities within the ice, often remnants from volcanic eruptions. These areas of weakness, where the ice tends to crack and slip, produce small seismic disturbances as the glacier shifts.This discovery sheds light on the complex dynamics of glacier motion, suggesting that the process is more intricate than previously thought. By identifying these subtle movements, scientists can better understand the future trajectory of climate change and its effects on sea levels.
