Swiss officials announced over the weekend that they would halt search operations for 8 missing hikers after a massive landslide near the small village of Bondo, Switzerland. Geologists toured the source area by helicopter and determined it was unsafe to continue the search. The event is referred to as a rock avalanche by the Landslide Blog, and Professor Petley had two links to videos of the event. The first, showing the initiation of the landslide is shown below. The landslide occurred on Piz Cengalo above Bondo on August 25 and resulted in a debris flow 5 km downstream at the town.
Since I last posted about this landslide, ADOT has added several videos to their YouTube channel. It’s clear that this highway is going to be closed for the long term. ADOT and their on-call geotechnical consultant tasked with this project, Kleinfelder, are currently drilling boreholes to attempt to characterize the failure surface and determine what the geometry of the failure surface is. They are installing at least 10 inclinometers to try to determine the location of the slip plane or planes at depth and they have two extensometers to measure if any additional movement occurs. They are also performing LIDAR surveys as well. Check out the videos below.
Initial ADOT Video Describing the Failure
Click through for the videos!