Decadal volcanic deformation in the Central Andes Volcanic Zone revealed by InSAR time series
Article first published online: 6 MAY 2013
© 2013. American Geophysical Union. All Rights Reserved.
Geochemistry, Geophysics, Geosystems
How to Cite
2013), Decadal volcanic deformation in the Central Andes Volcanic Zone revealed by InSAR time series, Geochem. Geophys. Geosyst., 14, doi:10.1002/ggge.20074., and (
- Article first published online: 6 MAY 2013
- Accepted manuscript online: 22 FEB 2013 12:55PM EST
- Manuscript Accepted: 22 JAN 2013
- Manuscript Revised: 17 JAN 2013
- Manuscript Received: 22 OCT 2012
 Decadal trends of volcanic deformation in the Central Andes Volcanic Zone (CVZ) are identified with Interferometric Synthetic Aperture Radar (InSAR) stacks and time series velocity maps covering an area 19°S–27°S and 66°W–69°W. We combine over 750 ERS and Envisat interferograms from two descending and three ascending tracks. These tracks cover 100,000 km 2 and span 1992–2011. Our analysis extends observations at Cerro Blanco, Uturuncu, and Lazufre volcanic centers and uncovers two previously undocumented deformation centers: Cerro Overo in Northern Chile and Putana Volcano in Southwest Bolivia. Cerro Overo exhibits a transition from steady −0.4 cm/yr deflation to 0.5 cm/yr inflation over several years. Putana Volcano underwent a short‒lived episode of uplift between 13 September 2009 and 31 January 2010, with a maximum uplift of 4.0 cm. Cerro Blanco continues −1.0 cm/yr deflation since 1995. Uplift at Lazufre began between 1997 and 2000 and has gradually accelerated to 3.5 cm/yr since 2005. Uturuncu volcano continues 1.0 cm/yr monotonic uplift since 1992 and shows evidence for a broad moat of subsidence surrounding the uplifting region. Four of the nine deformation events in the CVZ are not obviously associated with a particular volcanic edifice. Furthermore, there is significant spatial and temporal variability of these deformation events within a small geographic area.