Vertical view of all boulders recorded by drone observation in 2021. Note that in this representation north is up. The pale blue arrow shows the flow direction of the glacier. The base image shows the glacier surface on 29.7.2021. Displacement of each boulder is indicated by a black arrow. Four lines each, extending from boulders 1, 2 and 3 (at the starting position) go to positions of small painted marker stones which are considered stationary relative to the glacier flow. Each of these lines is 4m long.