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Geosciences 2017, 7(2), 21; doi:10.3390/geosciences7020021

Combined Use of C- and X-Band SAR Data for Subsidence Monitoring in an Urban Area

1
Department of Earth Sciences, University of Firenze, Via La Pira 4, 50121 Firenze, Italy
2
Istituto per il Rilevamento Elettromagnetico dell’Ambiente, IREA-CNR, via Diocleziano 328, 80124 Napoli, Italy
3
Istituto di Metodologie per l’Analisi Ambientale, IMAA-CNR, Contrada Santa Loja-Zona Industriale, Tito Scalo, 85050 Tito, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Francesca Cigna and Jesús Martínez Frías
Received: 3 February 2017 / Revised: 29 March 2017 / Accepted: 29 March 2017 / Published: 1 April 2017
(This article belongs to the Special Issue Observing Geohazards from Space)
View Full-Text   |   Download PDF [11019 KB, uploaded 1 April 2017]   |  

Abstract

In this study, we present the detection and characterization of ground displacements in the urban area of Pisa (Central Italy) using Interferometric Synthetic Aperture Radar (InSAR) products. Thirty RADARSAT-2 and twenty-nine COSMO-SkyMed images have been analyzed with the Small BAseline Subset (SBAS) algorithm, in order to quantify the ground subsidence and its temporal evolution in the three-year time interval from 2011 to 2014. A borehole database was reclassified in stratigraphical and geotechnical homogeneous units, providing the geological background needed for the local scale analysis of the recorded displacements. Moreover, the interferometric outputs were compared with the last 30 years’ urban evolution of selected parts of the city. Two deformation patterns were recorded by the InSAR data: very slow vertical movements within the defined stability threshold (±2.5 mm/yr) and areas with subsidence rates down to −5 to −7 mm/yr, associated with high peak velocities (−15 to −20 mm/yr) registered by single buildings or small groups of buildings. Some of these structures are used to demonstrate that the high subsidence rates are related to the recent urbanization, which is the trigger for the accelerated consolidation process of highly compressible layers. Finally, this urban area was a valuable test site for demonstrating the different results of the C- and X-band data processing, in terms of the density of points and the quality of the time series of deformation. View Full-Text
Keywords: A-DInSAR; subsidence; urban area; C- and X-band satellites A-DInSAR; subsidence; urban area; C- and X-band satellites
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Solari, L.; Ciampalini, A.; Raspini, F.; Bianchini, S.; Zinno, I.; Bonano, M.; Manunta, M.; Moretti, S.; Casagli, N. Combined Use of C- and X-Band SAR Data for Subsidence Monitoring in an Urban Area. Geosciences 2017, 7, 21.

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