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. A spatiotemporal reconstruction of slope movements on theedge of Lake Lucerne near the municipality of Horw, canton of Lucerne, ispresented. The reconstruction was realized by analyzing growth reactions ofbeech (Fagus sylvatica L.) and fir (Abies alba Mill.) trees growing on this slope. Beforedendrochronological sampling, a detailed geomorphological mapping of thelandslide was conducted with the aim to determine the spatial extent of thesliding area. For tree-ring analyses, 124 increment cores from 62 trees wereanalyzed following standard techniques of dendrogeomorphology. In addition,long micro-sections were prepared from the entire cores to extend the commoneccentricity analyses by microscopic determination of the onset of reactionwood in fir and beech. Results clearly show that the area is moving atleast since 1948. A significant concentration of events was observed betweenthe years 1990 and 2000 as well as after 2006. The definition of a thresholdto define events using an eccentricity index alone is problematic and needsto be adapted to specific site conditions. For this reason, we recommend always combining the application of an eccentricity index with a detailedvisual (anatomical) inspection to check for the occurrence of reaction wood.

Reconstruction and actual trends of landslide activities in Bruust–Haltiwald, Horw, canton of Lucerne, Switzerland