Such events are most common in the hottest months of the year, as the permafrost gluing the rock together melts, making the surface unstable. But the slide recorded by several climbers in the area ...

Lachenbruch was an expert in permafrost, the rock-like layer of frozen soil just ... This allows the pipe to slide sideways as it expands (when it's hot) and contracts (when it's cold).

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Such a slide represents another manifestation ... “Observations around the Alps show permafrost degradation is the main trigger for high-elevation rock avalanches.” This article was originally ...