Abstract
Large landslides and deep-seated gravitational slope deformations (DSGSD) represent an important geo-hazard in relation to the deformation of large structures and infrastructures and to the associated secondary landslides. DSGSD movements, although slow (from a few millimetres to several centimetres per year), can continue for very long periods, producing large cumulative displacements and undergoing partial or complete reactivation. Therefore, it is important to map the activity of such phenomena at a regional scale. Ground surface displacements at DSGSD typically range close to the detection limit of monitoring equipment but are suitable for synthetic aperture radar (SAR) interferometry. In this paper, permanent scatterers (PSInSAR™) and SqueeSAR™ techniques are used to analyse the activity of 133 DSGSD, in the Central Italian Alps. Statistical indicators for assigning a degree of activity to slope movements from displacement rates are discussed together with methods for analysing the movement and activity distribution within each landslide. In order to assess if a landslide is active or not, with a certain degree of reliability, three indicators are considered as optimal: the mean displacement rate, the activity index (ratio of active PS, displacement rate larger than standard deviation, overall PS) and the nearest neighbor ratio, which allows to describe the degree of clustering of the PS data. According to these criteria, 66% of the phenomena are classified as active in the monitored period 1992–2009. Finally, a new methodology for the use of SAR interferometry data to attain a classification of landslide kinematic behaviour is presented. This methodology is based on the interpretation of longitudinal ground surface displacement rate profiles in the light of numerical simulations of simplified failure geometries. The most common kinematic behaviour is rotational, amounting to 41 DSGSDs, corresponding to the 62.1% of the active phenomena.
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Acknowledgements
The authors are deeply indebted to Andrea Valagussa, Roberta Ignagnaro, Luca Corno and Laura Frati for partly preparing the datasets. Elena Valbuzzi is thanked for the continuous support in maintaining the datasets. The authors thank Federico Agliardi for fruitful discussion on DSGSD distribution on the Alps. Finally, the authors are indebted to Massimo Ceriani, from Regione Lombardia and Alessandro Ferretti, from Tre-Altamira, for their help in providing PSInSAR™ and SqueeSAR™ data. This work has been supported by Fondazione Cariplo, grant no 2016-0757.
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Frattini, P., Crosta, G.B., Rossini, M. et al. Activity and kinematic behaviour of deep-seated landslides from PS-InSAR displacement rate measurements. Landslides 15, 1053–1070 (2018). https://doi.org/10.1007/s10346-017-0940-6
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DOI: https://doi.org/10.1007/s10346-017-0940-6