In 1991 about 30 million cubic meters of rocks fell from a rock face near the village of Randa (10 km north of Zermatt). Rockslide installation of 3 strain sensor chains in borehole and surface installation of strain sensors on 2 cracks.
Automatic triggering and storing of 1000 Hz dynamic data during (micro)seismic activity.
| INSTALLATION PERIOD | TYPE OF SENSORS | NUMBER OF SENSORS |
| 2008 | MuST | 11 |
Rock-slide overview (Google Earth view)
Hut with control room on top on the slide
Control room hut
MuST sensor installed on crack (left grey protection tube)
MuST sensor installed on crack (middle grey protection tube)
Grouting during borehole installation of sensor chains
MuST deformation sensor on Crack 'x2': Transient crack opening caused by a nearby Mag 3.4 earthquake
