ABSTRACT
In this chapter we describe key scientific issues and give technical recommendations for the design, installation and operation of in-situ monitoring systems related to the study of progressive failure processes in rock slopes composed of fractured crystalline rocks. The monitoring systems are explained and discussed with landslide examples from the Swiss Alps: the actively creeping Moosfluh toppling instability with a volume of 100–200 million m3, the slowly moving complex instability at Randa (5–6 million m3), and the compound sliding instability at Preonzo (300,000–400,000 m3), which partially failed in 2012.
