Persistent uplift of the Lazufre volcanic complex (Central Andes): New insights from PCAIM inversion of InSAR time series and GPS data


Por: Remy D., Froger J.L., Perfettini H., Bonvalot S., Gabalda G., Albino F., Cayol V., Legrand D., De Saint Blanquat M.

Publicada: 1 ene 2014
Resumen:
We reanalyzed the surface displacements observed at the Lazufre volcanic complex in the Southern Andean Central Volcanic Zone using GPS measurements made between 2006 and 2008 and a large InSAR data set. We performed a detailed spatiotemporal analysis of the displacements using a principal component analysis inversion method (PCAIM). The PCAIM reveals a source with no significant changes in shape and dimension and with a remarkably linear strength increase over the whole period of observation (i.e., 2003-2010). Then we used a three-dimensional mixed boundary element method (MBEM) to invert the first component of surface displacement as obtained from PCAIM. We explored a continuum of geometries from a shallow elliptic crack to a deep massive truncated elliptical cone that could represent a sill or a large magma chamber, respectively. The best models indicate a large flat-topped source with a roof area between 40 and 670 km2 and a depth of between 2 and 14 km below ground surface. Lastly, on the basis of the limited data available for the thermomechanical structure of the crust in the Southern Andean Central Volcanic Zone, we consider some possible scenarios to explain the spatial and temporal pattern of displacements at Lazufre. ©2014. American Geophysical Union.

Filiaciones:
Remy D.:
 GET/UMR 5563 (UPS, CNRS, IRD, CNES), Observatoire Midi-Pyrénées, Université P. Sabatier, Toulouse, France

Froger J.L.:
 LMV/UMR 6524 (UBP-CNRS-IRD), Observatoire de Physique du Globe de Clermont-Ferrand, Université B. Pascal, Clermont-Ferrand, France

Perfettini H.:
 ISTERRE/UMR 5275 (UJF, CNRS, IRD), Observatoire des Sciences de l Univers de Grenoble, Université Joseph Fourier, Grenoble, France

Bonvalot S.:
 GET/UMR 5563 (UPS, CNRS, IRD, CNES), Observatoire Midi-Pyrénées, Université P. Sabatier, Toulouse, France

Gabalda G.:
 GET/UMR 5563 (UPS, CNRS, IRD, CNES), Observatoire Midi-Pyrénées, Université P. Sabatier, Toulouse, France

Albino F.:
 LMV/UMR 6524 (UBP-CNRS-IRD), Observatoire de Physique du Globe de Clermont-Ferrand, Université B. Pascal, Clermont-Ferrand, France

 Now at Department of Earth Sciences, Cartography and Remote Sensing Unit, Royal Museum for Central Africa, Tervuren, Belgium

Cayol V.:
 LMV/UMR 6524 (UBP-CNRS-IRD), Observatoire de Physique du Globe de Clermont-Ferrand, Université B. Pascal, Clermont-Ferrand, France

Legrand D.:
 Departamento de Geofísica, Universidad de Chile, Santiago, Chile

 Now at Instituto de Geofisica, Universidad Nacional Autónoma de México, Coyoacan, Mexico

De Saint Blanquat M.:
 GET/UMR 5563 (UPS, CNRS, IRD, CNES), Observatoire Midi-Pyrénées, Université P. Sabatier, Toulouse, France
ISSN: 15252027
Editorial
Blackwell Publishing Ltd, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA, Estados Unidos America
Tipo de documento: Article
Volumen: 15 Número: 9
Páginas: 3591-3611
WOS Id: 000343970900006

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