Analysis of building deformation in landslide area using multisensor PSInSARTMtechnique

Buildings are sensitive to movements caused by ground deformation. The mapping both of spatialand temporal distribution, and of the degree of building damages represents a useful tool in order tounderstand the landslide evolution, magnitude and stress distribution. The high spatial resolution ofspace-borne SAR interferometry can be used to monitor displacements related to building deformations.In particular, PSInSAR technique is used to map and monitor ground deformation with millimeter accu-racy. The usefulness of the above mentioned methods was evaluated in San Fratello municipality (Sicily,Italy), which was historically affected by landslides: the most recent one occurred on 14th February 2010.PSInSAR data collected by ERS 1/2, ENVISAT, RADARSAT-1 were used to study the building deformationvelocities before the 2010 landslide. The X-band sensors COSMO-SkyMed and TerraSAR-X were used inorder to monitor the building deformation after this event. During 2013, after accurate field inspectionon buildings and structures, damage assessment map of San Fratello were created and then comparedto the building deformation velocity maps. The most interesting results were obtained by the compari-son between the building deformation velocity map obtained through COSMO-SkyMed and the damageassessment map. This approach can be profitably used by local and Civil Protection Authorities to managethe post-event phase and evaluate the residual risks. © 2014 The Authors. Published by Elsevier B.V.