NON-LINEAR LAND SUBSIDENCE IN MORELIA, MEXICO, IMAGED THROUGH SYNTHETIC APERTURE RADAR INTERFEROMETRY Francesca Cigna (1,*), Batuhan Osmanoğlu (1,†), Enrique Cabral-Cano (2), Timothy H. Dixon (1,‡), Shimon Wdowinski (1) (1) Division of Marine Geology and Geophysics, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149- 1098, USA, Email:
[email protected] (2) Departamento de Geomagnetismo y Exploración, Instituto de Geofísica, Universidad Nacional Autónoma de México. Ciudad Universitaria, 04510 México D.F., México (*) Present address: Department of Earth Sciences, University of Firenze, Via La Pira 4, 50121 Firenze, Italy (†) Present address: Geophysical Institute, University of Alaska, 903 Koyukuk Dr., Fairbanks, Alaska 99775-7320, USA (‡) Present address: Department of Geology, University of South Florida, 4202 E. Fowler Avenue, SCA 528, Tampa, FL 33620-8100, USA ABSTRACT Synthetic Aperture Radar Interferometry (InSAR) and Persistent Scatterer Interferometry (PSI) were used to Land subsidence affecting the city of Morelia in 2003- investigate spatial and temporal patterns of land 2010 is imaged with 23 ENVISAT scenes. Newly subsidence affecting Morelia in 2003-2010. Reference developed subsidence is recognized in the Rio Grande [5] presents the results of these analyses for the whole meander area, where thick compressible deposits suffer city and compares PSI and InSAR observations with from accelerated aquifer compaction induced by recent GPS, geological and groundwater extraction data. groundwater extractions. Persistent Scatterer (PS) This work focuses on a newly developed subsidence analyses using linear and quadratic deformation models feature in the area of Rio Grande river (Fig. 1), and both result in low density of targets, while small- employs both linear and quadratic deformation models baseline interferograms show good coherence over the during the PSI processing.