Active rock glacier
Elevation: 2420-2740m - Massif: Valais Alps (Mischabel) - Commune: Randa (VS)
The Gänder rock glacier, located on the orographic right side of the Mattertal is one of five rock glaciers that were found to be destabilized in the mid-2000s using satellite interferometry (InSAR). Its terminal part is destabilized at least since the 1970’s (development of scarps and velocities > 2m/y). However, only part of this destabilized section furnishes rock debris into a tributary channel of the Wildibach torrent. The destabilized part (between about 2500 and 2640 m a.s.l.) has moved at relatively constant velocities since the 1970’s. The front part is decelerating gradually since 2012. The first displacement measurements (DGPS) have been started there in 2009.
Measurements and observations
Geophysics (geoelectric, refraction seismic)
Remote Sensing (Webcam 2011-2013, aerial image)
Measured horizontal flow field (mean annual velocity).
Annual horizontal surface velocity. Mean of a set of points selected in the most active part of the rock glacier. Annual survey interval
Kanton Wallis – Dienststelle für Wald, Flussbau und Landschaft (DWFL)
Delaloye, R., Morard, S., Barboux, C., Abbet, D., Gruber, V., Riedo, M. and Gachet, S. (2013). Rapidly moving rock glaciers in Mattertal. In: Graf, C. (ed.) Mattertal – ein Tal in Bewegung. Publikation zur Jahrestagung der Schweizerischen Geomorphologischen Gesellschaft 29. Juni – 1. Juli 2011, St. Niklaus. Birmensdorf, Eidg. Forschungsanstalt WSL. 21-30. (pdf)