Rémy Dominique auteur aut IRD Froger J. L. auteur aut IRD Perfettini Hugo auteur aut IRD Bonvalot Sylvain auteur aut IRD Gabalda Germinal auteur aut IRD Albino F. auteur aut IRD Cayol V. auteur aut IRD Legrand D. auteur aut IRD De Saint Blanquat M. auteur aut IRD text journalArticle eng text/pdf born digital access 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 km(2) 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. specialized InSAR GPS volcano deformation CHILI ANDES 066 126 15 9 3591-3611 2014 1525-2027 https://www.documentation.ird.fr/hor/fdi:010062686 10.1002/2014gc005370 1525-2027 [F B010062686] https://www.documentation.ird.fr/hor/fdi:010062686 https://www.documentation.ird.fr/intranet/publi/2014/12/010062686.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-01-12 2021-01-24 fdi:010062686 fre