Il metodo della ricollocazione nella risoluzione di problematiche geologico-ambientali: il caso di Zeri (Ms)

The use of photogrammetry techniques is an operative instrument for the definition of geometry and deep kinematics of complex large-scale mass movements. Many informations about deep mechanisms especially in complex geological-geomorphological situations, can be obtained by means of superficial displacements vectorial analysis. These are achieved by the comparison of aerophotogrammetrical and topographical survey data referred to a wide time period, pre and post landslide. Starting from simple models of different landslide typologies (rotational, rototraslational, etc.) and analysing the plano-altimetric variations before and after the movement and the consequential distribution of displacement vectors, it’s possible to create a preliminary classification of the slope movements type and to give some indications about probable depth of rupture surfaces. This methodology is especially useful in urbanised areas for the presence of infrastructures whose location can be easily monitored during the phenomena development. This kind of methodological approach has been employed in the study of Patigno landslide, located in Zeri town (MS). As far as is concerned superficial displacement analysis aerial panchromatic photograms have been utilized referred to a 23 years time period (1976-1999); then a vectorial analysis of anthropic structures displacements occurred in the same period has been carried out