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Published August 6, 2004 | Supplemental Material + Published
Journal Article Open

An InSAR-based survey of volcanic deformation in the southern Andes

Abstract

We use Interferometric Synthetic Aperture Radar (InSAR) to search for surface deformation in the southern Andes (40°S–46°S and 49°S–53°S) associated with magmatic processes. Although the available data are not optimal, we can constrain the amount of volcanic deformation at about 27 Holocene volcanoes between the years 1993–1999. We detect inflation of Cerro Hudson volcano following its 1991 eruption, and use spherical and non-spherical models to constrain the source of deformation to be between 4 and 8 km below sea level. We measure the rate of deformation to be about 5 cm/year in the radar line-of-sight, and infer that the maximum deformation could exceed 10 cm/year in the center of the caldera. Within the errors of the measurements, the rate of deformation is constant from 1993–1998 (10–30 × 10^6 m^3/year). At this rate, 100–200 years is required to accumulate the volume of material erupted in 1991.

Additional Information

© 2004 by the American Geophysical Union. Received 18 May 2004; revised 30 June 2004; accepted 8 July 2004; published 6 August 2004. We thank two anonymous referees for comments and R. B. Lohman, Y. Fialko, and L. Rivera for modeling software. ERS SAR imagery was acquired under a Category 1 research project from the European Space Agency. The GMT program was used to create several figures [Wessel and Smith, 1998]. M.E.P. was partly supported by a Hess postdoctoral fellowship from Princeton University. Contribution number 9081 of the Division of Geological and Planetary Science, Seismological Laboratory, California Institute of Technology.

Attached Files

Published - Pritchard_2004b.pdf

Published - grl18620-sup-0002-Table1.txt

Supplemental Material - grl18620-sup-0001-README.txt

Supplemental Material - grl18620-sup-0003-Table2.txt

Supplemental Material - grl18620-sup-0004-SuppFig.ps

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