Observations of Deformation

Volcano number:357090
Country:Chile - Argentina
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:Late 2012 (ref 1)and 2002 to 2007 (ref 2), December 2002 and April 2006 (ref 3)
Inferred cause(s) of deformation:Magmatic
Characteristics of deformation:

Copahue is a southern Andes volcano that has been inflating since early 2012, with intermittent summit eruptive activity since late 2012. We have an extensive InSAR time series from RADARSAT-2 and COSMO-SkyMed data, although both are from descending tracks. Preliminary modeling suggests a very irregular magma body that extends from the volcanic edifice to less than 5 km depth and located slightly north of the summit at shallow depths but to the ENE at greater depths. Ref 1
A deformation rate of approximately 2 cm/yr was calculated, located mostly on the north-eastern flank of Copahue volcano, and assumed to be constant during the period of the interferograms. Results from inverse modelling indicate that a source located beneath the volcano edifice at a mean depth of 4 km is producing a volume change of approximately 0.0015 km/yr.  Ref 2
The models for the 2 interferograms indicate a relatively constant contraction rate of about 0.001 km3/yr. The shallow depth of the source, 4 km, is consistent with the expected depth of hydrothermal activity. Ref 3.

Reference(s):Lundgren, P., Camacho, A., Poland, M. P., Miklius, A., Samsonov, S. V., & Milillo, P. (2013, December). Imaging irregular magma reservoirs with InSAR and GPS observations: Application to Kilauea and Copahue volcanoes. In AGU Fall Meeting Abstracts.
Velez, M. L., Euillades, P., Caselli, A., Blanco, M., & Díaz, J. M. (2011). Deformation of Copahue volcano: inversion of InSAR data using a genetic algorithm. Journal of Volcanology and Geothermal Research, 202(1), 117-126.
Fournier, T. J., Pritchard, M. E., & Riddick, S. N. (2010). Duration, magnitude, and frequency of subaerial volcano deformation events: New results from Latin America using InSAR and a global synthesis. Geochemistry, Geophysics, Geosystems, 11(1).
Location:-37.856, -71.183
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