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Displacement rates of mountain slope deformations that can affect entire valley mountain flanks are often measured spatially distributed in‐situ without spatial significance. The spatially explicit measurement and recording of time series of slope deformations is a challenge, as the unstable slopes are often disintegrated into several subdomains, which move with different deformation rates. The current state‐of‐the‐art monitoring systems detect slow to very slow deformation rates between mm/a and several m/a. Using the examples of slope deformations in Saalbach‐Hinterglemm and the deep rock slide Marzellkamm in Austria this paper presents the results of terrestrial laser scans, extensometer measurements, Spaceborne InSAR data, unmanned Aerial System Photogrammetry (UAS‐P), and fixed‐point measurements. The different measurements complement each other and are optimally aligned for different application areas. InSAR data can help to identify hot spots on regional and local scale, while UAS‐P enables for spatially high level accuracy in the detection of subdomains moving at different speeds. For local warning systems TLS, extensometers and GBInSAR deliver higher accuracy. [ABSTRACT FROM AUTHOR]

Following a rockslide in a former quarry near the town of Dürnstein/Wachau, extensive remedial measures were necessary to restore the damaged rail infrastructure and ensure long term safety. To provide for safe working conditions during the phase of construction of additional protection measures, a geotechnical risk management system based on the observational method per EC 7 was developed and implemented. Geotechnical monitoring was a key safety management element. The paper discusses the specific challenges, practical approaches and general experiences associated with the use of the observational method for the monitoring of cliff faces. Nach einem Felssturz in einem ehemaligen Steinbruchgelände nahe der Ortschaft Dürnstein/ Wachau waren umfangreiche Maßnahmen zur Wiederherstellung und langfristigen Sicherung der stark beschädigten Bahnlinie erforderlich. Um während der Sanierungsphase die Sicherheit gewährleisten zu können, wurde ein Risikomanagement in Anlehnung an die Beobachtungsmethode nach EC 7 geplant und umgesetzt. Zentraler Bestandteil des Sicherheitsmanagementplans waren geotechnische Messungen. Der vorliegende Beitrag berichtet über die speziellen Herausforderungen, konkreten Problemlösungsansätze und allgemeinen Erfahrungen bei der Anwendung der Beobachtungsmethode zur Überwachung von Felswänden. [ABSTRACT FROM AUTHOR]