UIS Commission on Karst Hydrogeology and Speleogenesis
Email Print

Karstbase Bibliography Database

Original article
Weißmair, R.
Eisdatierung und eisveränderungen im kraterschacht (1651/24, sengsengebirge, oberösterreich) zwischen 1992 und 2009
Ice-dating and ice fluctuations in the Kraterschacht (Sengsengebirge, Upper Austria) between 1992 and 2009
The Kraterschacht (1651/24) in the Sengsengebirge (Upper Austria) opens at an altitude of 1500 m at the southern flank of this high alpine mountain range. Discovered in 1990, the shaft leads to a depth of –250 m through two main chambers, the entrance shaft reaching –90 m and finally a huge chamber of some 150.000 m³. This fault-oriented passage is largely filled with cave-ice that formed due to the compression of snow that easily entered through the entrance shaft with its cross sectional area of 700 m². From 1992 to 2009 the cave-ice body with an ice-density up to 880 kg/m³ lost 6000 m³ (6%) of its volume. This is only three times more than the annual fluctuation of ice volume. The 14C-age of a small twig from near the ice-base (1030 to 1225 AD) points towards a most likely high-medieval age of the cave-ice.