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This paper studies the evolution of a zone in the Fimbul Ice Shelf  that is characterised by large crevasses and rifts west of  Jutulstraumen, an outlet glacier flowing into Fimbulisen.  High-resolution radar imagery and radio echo sounding data were used  to study the surface and internal structure of this rift area and to  define zones of similar characteristics. The western rift area is  dominated by two factors: a small ice rumple that leads to basal  crevasses and disturbs the homogeneity of the ice, and a zone with  fibre-like blocks. Downstream of the rumple we found down-welling of  internal layers and local thinning, which we explain as a result of  basal crevasses due to the basal drag at the ice rumple. North of  Ahlmannryggen the ice loses its lateral constraint and forms  individual blocks, which are deformed like fibres under shear, where  the ice stream merges with slower moving ice masses of the western  side. There, the ice loses its integrity, which initiates the  western rift system. The velocity difference between the slow moving  western part and the fast moving extension of Jutulstraumen produces  shear stress that causes the rifts to form tails and expand them to  the major rifts of up to 30 km length

The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica