Abstract

The history of catastrophic advances of Vernagtferner (Ötztal Alps, Tyrol) is described briefly. To all appearances these advances were surges. They occurred periodically with a short active advance and a much longer time of retreat; the whole cycle lasted on an average 82 years. The mode of flow of the ice changed typically, i.e. speed during surges increased more than one order of magnitude with heavy crevassing. Dimensions of advance and of retreat were much larger than known from other glaciers in the area.

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