Event description


On November 14, 1920, a rock fall from Fletschhorn occured. The rock material moved along the glacier surface by mobilizing ice and snow. The rock/ice/snow avalanche had a total volume of 7.5 Mio m3 and travelled down a distance of 5 km. The avalance didn`t reach the glacier end.




50 ha of forest destroyed.


Data source


N�tzli, J. (2003): Felsst�rze aus Permafrost �ber Gletscher, Ans�tze zur GIS-basierten Modellierung. Diplomarbeit am Geographischen Institut der Universit�t Z�rich.




A very similar phenomenon occurred in the same area on January 18, 1997.