En este trabajo se presenta una perspectiva general de la utilización de imágenes satelitales de radar en estudios geodinámicos. En primer lugar se introducen muy brevemente los principios de funcionamiento del radar de apertura sintética, que es el instr

EUILLADES, PABLO A.; EUILLADES, LEONARDO; BLANCO, MAURO; BROOKS, BENJAMIN

Roma

Workshop; Fringe 2009 Workshop; 2009

European Space Agency

<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:-1610611985 1107304683 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-US; mso-fareast-language:EN-US;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> <!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:-1610611985 1107304683 0 0 159 0;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-1610611985 1073750139 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-fareast-font-family:Calibri; mso-bidi-font-family:"Times New Roman"; mso-fareast-language:EN-US;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt; mso-ascii-font-family:Calibri; mso-fareast-font-family:Calibri; mso-hansi-font-family:Calibri;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> This study addresses the link between groundwater dynamics and crustal deformation in Mendoza metropolitan Area, Western Argentina. Mendoza is a medium-sized city, accounting for 1 million inhabitants and located at the toe of the Andes Precordillera. It is  surrounded by an agricultural belt. Main water supply for human consumption and agricultural activities is Mendoza River and its associated hydrogeological basin. The river is impounded at Potrerillos site, upstream of the study area.     By DInSAR-SBAS [Berardino, Fornaro et al. (2002)] processing of ENVISAT ASAR data between 2005 and 2008, we detected uplift and subsidence spatially associated to Mendoza River bed. Deformation in the aquifer system’s recharge area can be split in two different behavior zones: 1) East of Cipolletti dam it is characterized by a seasonal behavior, with uplift peaks in February-March and subsidence in August-September, 2) West of Cipolletti dam a steady uplift movement is observed. These areas are bounded by already mapped near vertical faults, as shown by Valero (1992).     We compared the observations with water level below the surface data measured in 183 water wells distributed all over the basin. Water heads data is measured yearly in winter season (August – September), between 1999 and 2007, and summer season measurements (February – March) are available in 2007 and 2008. Despite the low temporal resolution of this dataset, it can be observed a good time correlation between level rising and uplift areas.   We also studied water height and discharge time series of Potrerillos Lake. Discharge data is particularly relevant because it is directly related to the aquifer recharge in an area of high permeability. Not surprisingly, Potrerillos discharge peaks occur just before DInSAR revealed uplift peaks.   These results suggest a link between groundwater dynamics and crustal deformation. The deformation mechanism is not clearly stated, and probably exist more than one. East of Cipolletti area, compaction and expansion of the aquifer beds may be causing seasonal uplift and subsidence through poroelastic effects. West of Cipolletti, steady uplift may be related to sliding along water lubricated fault planes in a compressive environment.   As a conclusion, DInSAR observation seems to be strongly related to ground water dynamics in the area. Though the mechanisms relating observations are not straightforward, understanding them is crucial to assess the capability of DInSAR based methodologies to act as water level proxy measurements.   Berardino, P.; G. Fornaro; R. Lanari y E. Sansosti (2002). "A New Algorithm for Surface Deformation Monitoring Based on Small Baseline Differential SAR Interferograms." IEEE Transactions on Geoscience and Remote Sensing. Vol 40, Nº 11, pp. 2375-2383 Valero, C. (1992). Cuenca hidrogeológica de Mendoza Norte. Hidrogeología del área de máxima recarga del Río Mendoza. Actas del XII Congreso Geológico Argentino y II Congreso de Exploración de Hidrocarburos. Tomo VI, pp. 155-165. Mendoza.