Periodically the glacier developments over the L-shaped pond Lago Argentino developing a organic dam which divides the two sections of the river when it gets to the other coast. With no evade path, the water-level on the Brazo Rico side of the river can increase by up to 30 measures above the stage of the primary pond. The tremendous stress created by the size of the dammed water lastly smashes the ice buffer positioning it back, in a amazing crack occurrence. This crack pattern is not frequent and it recurs normally at any regularity between once a season to less than once a several years.
This season around 2,500 vacationer were lucky to observe the occurrence. The packed areas of people cheered as the 97-square-mile glacier splintered and ice gone down down. The glacier first cracked in 1917, taking with it an historical woodlands of beech plants. The last crack took place two days ago in April 2, 2012, and formerly in 2008. Completely 21 bursts has been registered since 1917.
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