HR: 0800h
AN: T11A-0351    [Abstracts]
TI: Ground Subsidence in the Granada City and Surrounding Area (Spain) using DInSAR Monitoring
AU: * Sousa, J J
EM: jjmsousa@gmail.com
AF: Observatório Astronómico da Universidade do Porto, Alameda do Monte da Virgem, Vila Nova de Gaia, 4430, Portugal
AU: Hanssen, R
EM: R.F.Hanssen@tudelft.nl
AF: Delft Institute of Earth Observation and Space Systems Delft University of Technology, Kluyverweg 1, Delft, 2629 HS, Netherlands
AU: Bastos, L
EM: lcbastos@fc.up.pt
AF: Observatório Astronómico da Universidade do Porto, Alameda do Monte da Virgem, Vila Nova de Gaia, 4430, Portugal
AU: Ruiz, A
EM: amruiz@ujaen.es
AF: Departamento de Ingeniería Cartográfica, Geodésica y Fotogrametría Universidad de Jaén, Campus Las Lagunillas s/n, Edif. A3, Jaen, 23071, Spain
AU: Perski, Z
EM: Z.A.Perski@tudelft.nl
AF: Delft Institute of Earth Observation and Space Systems Delft University of Technology, Kluyverweg 1, Delft, 2629 HS, Netherlands
AU: Gil, A
EM: ajgil@ujaen.es
AF: Departamento de Ingeniería Cartográfica, Geodésica y Fotogrametría Universidad de Jaén, Campus Las Lagunillas s/n, Edif. A3, Jaen, 23071, Spain
AB: Differential SAR interferometry (DInSAR) is a remote sensing technique which has been successfully used, since the final of the eighties, for different applications such as coseismic deformation mapping, volcano deformation monitoring, landslides monitoring and subsidence detection among others. This is an alternative technique to obtain measurements of the surface displacement providing better spatial resolution and comparable accuracy while being less time consuming than conventional surveying methods. However, spatial and temporal decorrelation and atmospheric signal contributions in repeat-pass SAR interferometry often hamper the accurate measurement of surface displacements in SAR interferograms. In 1999, the POLIMI SAR group implemented a different process allowing overcoming these difficulties by interpreting time-series of interferometric phases at coherent point scatterers. This technique was called the Permanent Scatterer techniques, which allow us to measure deformation with accuracies of millimetres per year. Since then, other techniques have been suggested following similar processing lines, such as the Persistent Scatterer Interferometry (PSI) developed at Delft Technical University (The Netherlands). In this study, we apply PSI technique using two time-series of 32 ERS-1/2 and 22 ENVISAT ASAR acquisitions of the Granada Basin, located at the central sector of the Betic Cordillera (southern Spain), covering the period from 1992 to 2005. This is the first time that the PSI technique is applied to derive displacement information in this southern Iberia region. This technique is very useful for the analysis of subsidence in urban areas, where angular structures produce efficient reflectors that dominate the background scattering. However, man-made structures are absent from most of the Earth's surface, such is the case in part of the studied area. After this first data processing, several subsidence areas have been detected in the southern part of Granada city and nearby villages. At the moment, some investigations are being carried out in order to find the relationship between the detected deformation and the tectonic deformation present in the area.
DE: 8175 Tectonics and landscape evolution
DE: 8194 Instruments and techniques
SC: Tectonophysics [T]
MN: 2007 Fall Meeting