Article

Decadal volcanic deformation in the Central Andes Volcanic Zone revealed by InSAR time series

  1. S. T. Henderson*,
  2. M. E. Pritchard

Article first published online: 6 MAY 2013

DOI: 10.1002/ggge.20074

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How to Cite

Henderson S. T., and M. E. Pritchard (2013), Decadal volcanic deformation in the Central Andes Volcanic Zone revealed by InSAR time series, Geochem. Geophys. Geosyst., 14, doi:10.1002/ggge.20074.

Author Information

  1. Department of Earth and Atmospheric Sciences, Cornell University 3162 Snee Hall, Ithaca, New York 14850, USA

* Corresponding author: S. T. Henderson, Department of Earth and Atmospheric Sciences, Cornell University 3162 Snee Hall, Ithaca, New York 14850, USA
(sth54@cornell.edu)

Publication History

  1. Article first published online: 6 MAY 2013
  2. Accepted manuscript online: 22 FEB 2013 12:55PM EST
  3. Manuscript Accepted: 22 JAN 2013
  4. Manuscript Revised: 17 JAN 2013
  5. Manuscript Received: 22 OCT 2012

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Keywords:

  • InSAR;
  • volcano;
  • Andes;
  • geodesy

[1] 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.

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