The EU Copernicus Program Sentinel-1 Synthetic Aperture Radar captures the advance of a rift on the Brunt Ice Shelf in late 2020 and early 2021. Ice surface velocity is derived by feature/speckle tracking between pairs of images separated by 6 days. The gradient of the velocity, or ‘strain’ shows where fractures are actively opening and here captures the advance of the rift tip.

When the rift breaks through to the thin ice beyond, the area of ice calved away will equal the size of Greater London. There is a good chance that, when mobile, this new iceberg will knock away a further piece the same size (labelled “Berg 1”) which has been hanging by a thread for many months.

You may freely download and republish this GIF animation (right-click, save-as) but if you use it elsewhere please do not remove or obscure the attribution to the Copernicus Program.