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Bonì, Roberta
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- PublicationRestrictedTwenty-year advanced DInSAR analysis of severe land subsidence: The Alto Guadalentín Basin (Spain) case study(2015)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Bonì, R.; Department of Earth and Environmental Science, University of Pavia, Via Ferrata 1, 27100 Pavia, 9 Italy ;Herrera, G.; Geohazards InSAR laboratory and modeling group. Instituto Geológico y Minero de España 12 (IGME), C/. Alenza 1, 28003 Madrid, Spain ;Meisina, C.; Department of Earth and Environmental Science, University of Pavia, Via Ferrata 1, 27100 Pavia, 9 Italy ;Notti, D.; Department of Earth and Environmental Science, University of Pavia, Via Ferrata 1, 27100 Pavia, 9 Italy ;Béjar-Pizarro, M.; Geohazards InSAR laboratory and modeling group. Instituto Geológico y Minero de España 12 (IGME), C/. Alenza 1, 28003 Madrid, Spain ;Zucca, F.; Department of Earth and Environmental Science, University of Pavia, Via Ferrata 1, 27100 Pavia, 9 Italy ;González, P. J.; Institute of Geophysics and Tectonics. School of Earth and Environment. University of Leeds, 19 Leeds, LS2 9JT, United Kingdom ;Palano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Tomás, R.; Geohazards InSAR laboratory and modeling group. Instituto Geológico y Minero de España 12 (IGME), C/. Alenza 1, 28003 Madrid, Spain ;Fernández, J.; Instituto de Geociencias (CSIC, UCM), Plaza de Ciencias 3, Ciudad Universitaria, 28040 Madrid, 25 Spain ;Fernández-Merodo, J. A.; Geohazards InSAR laboratory and modeling group. Instituto Geológico y Minero de España 12 (IGME), C/. Alenza 1, 28003 Madrid, Spain ;Mulas, J.; Unidad Asociada de investigación IGME-UA de movimientos del terreno mediante interferometría 15 radar (UNIRAD),Universidad de Alicante, P.O. Box 99, 03080 Alicante, Spain ;Aragón, R.; Unidad Asociada de investigación IGME-UA de movimientos del terreno mediante interferometría 15 radar (UNIRAD),Universidad de Alicante, P.O. Box 99, 03080 Alicante, Spain ;Guardiola-Albert, C.; Geohazards InSAR laboratory and modeling group. Instituto Geológico y Minero de España 12 (IGME), C/. Alenza 1, 28003 Madrid, Spain ;Mora, O.; Altamira Information, C/. Còrsega 381-387, 08037 Barcelona, Spain; ; ; ; ; ; ; ; ; ; ; ; ; ; A twenty-year period of severe land subsidence evolution in the Alto Guadalentín Basin (southeast Spain) is monitored using multi-sensor SAR images, processed by advanced differential interferometric synthetic aperture radar (DInSAR) techniques. The SAR images used in this study consist of four datasets acquired by ERS-1/2, ENVISAT, ALOS and COSMO-SkyMed satellites between 1992 and 2012. The integration of ground surface displacement maps retrieved for different time periods allows us to quantify up to 2.50 m of cumulated displacements that occurred between 1992 and 2012 in the Alto Guadalentín Basin. DInSAR results were locally compared with global positioning system (GPS) data available for two continuous stations located in the study area, demonstrating the high consistency of local vertical motion measurements between the two different surveying techniques. An average absolute error of 4.6 ± 4 mm for the ALOS data and of 4.8 ± 3.5 mm for the COSMO-SkyMed data confirmed the reliability of the analysis. The spatial analysis of DInSAR ground surface displacement reveals a direct correlation with the thickness of the compressible alluvial deposits. Detected ground subsidence in the past 20 years is most likely a consequence of a 100–200 m groundwater level drop that has persisted since the 1970s due to the overexploitation of the Alto Guadalentín aquifer system. The negative gradient of the pore pressure is responsible for the extremely slow consolidation of a very thick (> 100 m) layer of fine-grained silt and clay layers with low vertical hydraulic permeability (approximately 50 mm/h) wherein the maximum settlement has still not been reached.240 39 - PublicationRestrictedFrom ERS-1/2 to Sentinel-1: two decades of subsidence monitored through A-DInSAR techniques in the Ravenna area (Italy)(2017-03-30)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ;Land subsidence due to underground resources exploitation is a well-known problem that affects many cities in the world, especially the ones located along the coastal areas where the combined effect of subsidence and sea level rise increases the flooding risk. In this study, 25 years of land subsidence affecting the Municipality of Ravenna (Italy) are monitored using Advanced Differential Interferometric Synthetic Aperture Radar (A-DInSAR) techniques. In particular, the exploitation of the new Sentinel-1A SAR data allowed us to extend the monitoring period till 2016, giving a better understanding of the temporal evolution of the phenomenon in the area. Two statistical approaches are applied to fully exploit the informative potential of the A-DInSAR results in a fast and systematic way. Thanks to the applied analyses, we described the behavior of the subsidence during the monitored period along with the relationship between the occurrence of the displacement and its main driving factors.384 5 - PublicationRestrictedAn inter-disciplinary and multi-scale approach to assess the spatial variability of ground motion for seismic microzonation: the case study of Cavezzo municipality in Northern Italy(2020)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Seismic microzonation represents a basic tool for prevention activity planning and land management. An extensive and detailed microzonation study was performed with reference to the territory of the Municipality of Cavezzo, damaged during the seismic sequence hitting Emilia-Romagna Region, Northern Italy, in 2012. In this paper, we discuss the work carried out to characterize the spatial variability of ground motion amplification due to local soil conditions in the municipality area. An inter- and multi-disciplinary approach is presented, involving geotechnical engineers, geophysicists, geologists and seismologists from different institutions, to thoroughly characterize the territory using complementary techniques with different level of resolution and confidence. A considerable amount of geomorphological, geological, hydrogeological, seismological, geotechnical and geophysical investigations was collected and processed for the purpose. A GIS-based (Geographic Information System) platform was initially setup to manage the gathered data, which now includes the results of about 1000 geotechnical and geophysical tests. Such an extended dataset was then used as a primary constraint for the creation of a comprehensive pseudo-3D geotechnical and seismo-stratigraphic model of the territory, consisting of a dense grid of one-dimensional vertical profiles to depict the variability of the soil properties over the area. The model was finally used as input for linear-equivalent ground response analysis. For the calculation of the amplification factors, special emphasis was given to the treatment and propagation of the uncertainties of the model parameters, whose different realizations have been accounted through a logic tree approach.295 4