LONDON – An iceberg four mileswide has broken off from a glacier in eastern Greenland and scientists have captured the dramatic event on video.

New York University professor David Holland, an expert in atmospheric and ocean science, told The Associated Press that “this is the largest event we’ve seen in over a decade in Greenland.”

A June 22 video of the incident was taken by his wife, Denise Holland of NYU’s Environmental Fluid Dynamics Laboratory. They had camped by the Helheim Glacier for weeks to collect data to better project sea level changes due to global warming.

Holland said Wednesday that the time-lapse video, which is speeded up 20 times, shows “3 percent of the annual ice loss of Greenland occur in 30 minutes.”

“It sounded like rockets going off,” he said, describing it as “a very complex, chaotic, noisy event.”

While the couple is studying Greenland, he said that “the real concern is in Antarctica, where everything is so big the stakes are much higher.”

In northwestern Greenland, another large iceberg has apparently grounded on the sea floor near the village of Innarsuit. Residents with houses near the shore were prepared to evacuate if necessary.