Deformation of Copahue volcano: Inversion of InSAR data using a genetic algorithm

The Copahue volcano is one of the most active volcanoes in Argentina with eruptions having been reported as recently as 1992, 1995 and 2000. A deformation analysis using the Differential Synthetic Aperture Radar technique (DInSAR) was performed on Copahue-Caviahue Volcanic Complex (CCVC) from Envisa...

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Detalles Bibliográficos
Autores principales: Velez, M.L., Euillades, P., Caselli, A., Blanco, M., Díaz, J.M.
Formato: JOUR
Materias:
Copahue volcano
Deformation source
Genetic algorithm
SBAS-DInSAR
Subsidence
Volcanic-hydrothermal system
Active volcanoes
Argentina
Best fit
Conceptual model
D-inSAR
Deformation analysis
Deformation rates
Differential synthetic aperture radar
ENVISAT
Half-space
Hydrothermal system
InSAR data
Interferograms
Inverse modelling
Magmatic fluids
Mean velocities
Optimization tools
Phreatic
Pressure source
Radar image
Volcanic complex
Volume change
Deformation
Genetic algorithms
Geodetic satellites
Imaging systems
Radar
Synthetic aperture radar
Volcanoes
data inversion
Envisat-1
genetic algorithm
hydrothermal system
phreatic zone
subsidence
volcanic eruption
Copahue
Neuquen
Southern Volcanic Zone
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03770273_v202_n1-2_p117_Velez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The Copahue volcano is one of the most active volcanoes in Argentina with eruptions having been reported as recently as 1992, 1995 and 2000. A deformation analysis using the Differential Synthetic Aperture Radar technique (DInSAR) was performed on Copahue-Caviahue Volcanic Complex (CCVC) from Envisat radar images between 2002 and 2007. A deformation rate of approximately 2 cm/yr was calculated, located mostly on the north-eastern flank of Copahue volcano, and assumed to be constant during the period of the interferograms. The geometry of the source responsible for the deformation was evaluated from an inversion of the mean velocity deformation measurements using two different models based on pressure sources embedded in an elastic homogeneous half-space. A genetic algorithm was applied as an optimization tool to find the best fit source. Results from inverse modelling indicate that a source located beneath the volcano edifice at a mean depth of 4 km is producing a volume change of approximately 0.0015 km/yr. This source was analysed considering the available studies of the area, and a conceptual model of the volcanic-hydrothermal system was designed. The source of deformation is related to a depressurisation of the system that results from the release of magmatic fluids across the boundary between the brittle and plastic domains. These leakages are considered to be responsible for the weak phreatic eruptions recently registered at the Copahue volcano. © 2011 Elsevier B.V.

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