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MODELLING OF LOCAL ROCK-SLOPE MICRO-DEFORMATIONS AND TILTS AT ALPE DI ROSCIORO, SWITZERLAND
Abstract
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 tilt transients of the unstable block oriented towards the south-east which are parallel with the prevailing crack direction and perpendicular to the measured extension. Control data from sensor outside of the unstable block do not show such signals. Several possible scenarios are tested, in order to explain these observations. One of them, is the whole-block inclination, another is the local deformation of the material in the vicinity of the station. Low-frequency finite-difference (FD) modeling for simplified model of the block is used to propagate the deformations. The FD method is approximation to the complete set of elastodynamic equations and the simulations are performed for direct and reciprocal processes to study possible spatial attenuation of the permanent micro-deformations and tilts in the vicinity of sensors.
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