A city-sized block of ice calves near Britain's Halley science research station in the Antarctic.
The calving of large bergs from a shelf structure can lead to a speed-up in the flow of the ice. Before the calving, the Brunt was flowing westwards at a rate of about 3m/day. If it now experiences an acceleration, this could influence the behaviour of other cracks in the area. In particular, scientists are watching very closely a fissure they call the Halloween Crack. This is sited to the north and east of Halley, and is propagating away from the base.
The calving of bergs at the forward edge of an ice shelf is a very natural behaviour. The shelf likes to maintain an equilibrium and the ejection of bergs is one way it balances the accumulation of snowfall and the input of more ice from the feeding glaciers on land. Unlike on the Antarctic Peninsula on the other side of the Weddell Sea, scientists have not detected climate changes in the Brunt region that would significantly alter the natural process described above.
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