One of the hottest, most fascinating new fields in science doesn’t sound particularly exciting: distributed acoustic sensing, aka DAS. It involves using fiber optic cables to spy on the environment, and is proving to be enormously powerful. By analyzing the way that vibrations scatter light through the wires, scientists can detect volcanic eruptions, earthquakes, and even footsteps above. Last year, researchers laid a cable on the seafloor near a Greenland glacier, providing unprecedented insight into how the ice is rapidly deteriorating.Now a team working in the mountains of Switzerland has used DAS to expose another troubling trend in ice, known as hydrofracturing, in which meltwater seeps deep down and creates pressure. By studying the phenomenon, scientists can get a better idea of how ice the world over will decline, and therefore better predict consequent problems like sea level rise. “It’s hypothesized to be a mechanism that can cause mass disintegration of ice shelves and ice sheets in the Antarctic, Greenland, et cetera,” said Thomas Hudson, a seismologist at ETH Zurich in Switzerland and lead author of a recent... Read more
