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The finite-difference method is used to compute small local deformation of the rock slope instability Alpe di Roscioro, Switzerland. This retrogressively unstable mass failed multiply, with last large catastrophic event in 2012, when approximately 210 000 cubic meters of rock had collapsed towards Preonzo village. The remaining mass has been studied and monitored by passive seismic methods and exhibits strong directional spectral amplification. One of the monitoring seismometer detects many micro-deformations and ...