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vertices it is possible to observe

a vertical millimeter movement,

even if inside the ellipse error,

that denotes a presumable

subsidence trend. The data

acquired during the fourth survey,

performed in June 2015 and still

under processing, will allow

to compare a more significant

dataset and better understand the

behaviour of the cliffs.

Minimal changes have been

FIGURE 9 4HWZVM:SVWL4HZZ9H[LSLM[HUK:PJPS`9LNPVUJSHZZPÄJH[PVUYPNO[ recorded in the point clouds

acquired during the two Laser

movement of the four unstable vertices may be Scanner surveys of October 2012 and May 2013.

observed, but always inside the error ellipse and However the comparison of the different images

without an apparently defined trend. Only for E2 and O2 acquired is still being processed.

FIGURE 10 Displacements measured with the mechanical joints gauges: tell tales (A), removable joint-meters (B) and 3D joint-meters (C1, C2 and C3)

66 EAI Energia, Ambiente e Innovazione 4/2015