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

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...

Full description

Saved in:
Bibliographic Details
Published in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2014-09, Vol.15 (9), p.3591-3611
Main Authors: Remy, D., Froger, J. L., Perfettini, H., Bonvalot, S., Gabalda, G., Albino, F., Cayol, V., Legrand, D., Saint Blanquat, M. De
Format: Article
Language:English
Subjects:
Boundary element method
Chambers
Data
deformation
Depth
Displacement
Earth Sciences
Finite element analysis
Global positioning systems
GPS
Grounds
InSAR
Inversions
Lava
Magma
Magma chambers
Mathematical analysis
Methods
Petrography
Plate tectonics
Principal components analysis
Sciences of the Universe
Seismology
Shape
Strength
Synthetic aperture radar interferometry
Tectonics
Three dimensional
Time series
Uplift
volcano
Volcanoes
Volcanology
Citations: Items that this one cites
Items that cite this one
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. Key Points InSAR and GPS analysis using PCAIM
ISSN:1525-2027
1525-2027
DOI:10.1002/2014GC005370