INSTITUTO DE INVESTIGACIONES EN ENERGIA NO CONVENCIONAL
Unidad Ejecutora - UE
congresos y reuniones científicas
DInSAR and Optical Remote sensing techniques to support the geological analysis in volcanic areas: the Cerro Blanco/Robledo (northwest Argentina) volcanic complex case study
CARLO ALBERTO BRUNORI; EMILCE BUSTOS; CHRISTIAN BIGNAMI; MASSIMO MUSACCHIO; MARIA FABRIZIA BUONGIORNO
Congreso; GeoItalia 2011 VIII Forum Italiano di Scienze della Terra; 2011
Federazione Italiana di Scienze della Terra
Calderas are roughly circular depressions and are distinctive features in volcanic areas. These structures are some of the most studied volcanic features, particularly for their possible implications for hazard assessment and mitigation. In this work we process optical and microwaves remotely sensed data in order to study geological features of Cerro Blanco/Robledo volcanic complex, located in northwest Argentina. Ground deformations associated with the present-day volcanic activity are measured using DInSAR techniques, in particular by means of time series analysis. The Cerro Blanco/Robledo caldera, is unusual among the actively deforming volcanoes because it is subsiding. An ENVISAT-ASAR dataset has been processed on a descending track spanning from 29/04/2004 to 23/01/2007 using StamPS/MTI software. In a previous study, the measured rate of subsidence seems to decrease with time from a maximum of more than 2.5 cm/yr in the radar LOS (interferograms spanning 1996/71992) to less than 1.8 cm/yr (20001996). In this work we obtain a velocity map of the area showing a rate of subsidence of 11 mm/yr in the radar LOS, confirming the deformative trend. Terra-ASTER data will be used in order to depict the surface distribution of erupted products and their evolution with respect to time. The surface classification will be performed by using both the L1B Terra-ASTER data and L1B atmospherically corrected data set. A comparison among the results obtained by means of different atmospheric correction tool will be done. All the results will be compared with the available geo-lithological map also by using DTM understanding the role of the morphology on the recent volcanic evolution.