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May 24, 2014

Dead Branch of Norris Glacier Decay, Alaska

The Dead Branch of the Norris Glacier is a side valley of the Norris Glacier fed by the main glacier. Instead of tributary it is a distributary tongue. As the Norris Glacier has thinned and retreated 100 m from 1984-2013 recently the inflow had declined. The Dead Branch has retreated and a subglacial lake forms each spring that lifts the glacier causing concentric crevasses to form. The lake then drains …