0406 GMT January 27, 2020
The main rift in Larsen C, which is likely to lead to one of the largest icebergs ever recorded, is currently 180km long. The new branch of the rift is 15km long, sciencedaily.com reported.
Last year, researchers from the UK's Project Midas, led by Swansea University, reported that the rift was growing fast. Now, just 20km of ice is keeping the 5,000 square kilometers piece from floating away.
Professor Adrian Luckman of Swansea University College of Science, head of Project Midas, described the latest findings, "While the previous rift tip has not advanced, a new branch of the rift has been initiated. This is approximately 10km behind the previous tip, heading towards the ice-front.
“This is the first significant change to the rift since February of this year. Although the rift length has been static for several months, it has been steadily widening, at rates in excess of a meter per day.
“It is currently winter in Antarctica, therefore direct visual observations are rare and low resolution. Our observations of the rift are based on synthetic aperture radar (SAR) interferometry from the European Space Agency (ESA)'s Sentinel-1 satellites.
“Satellite radar interferometry allows a very precise monitoring of the rift development."
Researchers said the loss of a piece a quarter of the size of Wales will leave the whole shelf vulnerable to future break-up.
Larsen C is approximately 350m thick and floats on the seas at the edge of West Antarctica, holding back the flow of glaciers that feed into it.
Luckman said, "When it calves, the Larsen C Ice Shelf will lose more than 10 percent of its area to leave the ice front at its most retreated position ever recorded; this event will fundamentally change the landscape of the Antarctic Peninsula.
“We have previously shown that the new configuration will be less stable than it was prior to the rift, and that Larsen C may eventually follow the example of its neighbor Larsen B, which disintegrated in 2002 following a similar rift-induced calving event.”