Long-range Terrestrial Laser Scanning (TLS) is widely used in studies
on rock slope instabilities. TLS point clouds allow the creation
of high-resolution digital elevation models for detailed mapping
of landslide morphologies and the measurement of the orientation
of main discontinuities. Multi-temporal TLS datasets enable the quantification
of slope displacements and rockfall volumes. We present three case
studies using TLS for the investigation and monitoring of rock slope
instabilities in Norway: 1) the analysis of 3D displacement of the
Oksfjellet rock slope failure (Troms, northern Norway); 2) the detection
and quantification of rockfalls along the sliding surfaces and at
the front of the Kvitfjellet rock slope instability (Møre og Romsdal,
western Norway); 3) the analysis of discontinuities and rotational
movements of an unstable block at Stampa (Sogn og Fjordane, western
Norway). These case studies highlight the possibilities but also
limitations of TLS in investigating and monitoring unstable rock
slopes.