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An Anonymous Coward writes:

As the Larsen C ice shelf moves closer to calving one of the largest icebergs on record, there are clear signs of changes in the part of the shelf which is about to calve. In late June 2017, the soon-to-be iceberg tripled in speed, producing the fastest flow speeds ever recorded on Larsen C, and seemed to be on the verge of breaking free.

The latest data from 6th July reveal that, in a release of built-up stresses, the rift branched several times. Using data from ESA’s Sentinel-1 satellites, we can see that there are multiple rift tips now within 5 km of the ice edge. We expect that these rifts will lead to the formation of several smaller icebergs, as well as the large iceberg which we estimate will have an area of 5,800 sq km. Despite this, the iceberg remains attached to the shelf by a thin band of ice. It is remarkable how the moment of calving is still keeping us waiting.

http://www.projectmidas.org/blog/multiple-branches/

There is a nice animation showing the rift growth since just last year: http://www.projectmidas.org/assets/rift_insar_animation_july.gif

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