Looks like it is climate change related As the glaciers shrink, and the permafrost high in the mountains begins to thaw, the rock becomes unstable. In 2006 huge chunks of rock fell off Switzerland's famous Eiger, causing the closure of hiking trails and prompting geologists to warn that such events could be expected more often. In 2017, a massive landslide struck the village of Bondo, also in Graubünden, burying half the village and killing eight people. Last summer, latest measurements showed that Swiss glaciers had lost more than half their volume in the last 100 years.
