Sabancaya

Observations of Deformation
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Volcano number:	354006
Region:	South America
Country:	Peru
Geodetic measurements?	Yes
Deformation observation?	Yes
Measurement method(s):	InSAR
Duration of observation:	1993-2010 (ERS/Envisat), 2007-2011 (ALOS) 2012-2015 (TSX)
Inferred cause of deformation:	Magmatic, Faulting/tectonics
Characteristics of deformation:	Between 1993 and 1998, an area centred 7 km north of Sabancaya was uplifting at a rate of 2 cm/year (Pritchard & Simons 2002). The deformation pattern was well fit by an inflating point source at 11-13 km depth, inferred to be a magmatic source. In 2003, there was up to 5 cm of subsidence associated with a Mw 5.3 tectonic earthquake to the west of Sabancaya on 13 December 2002 (Jay et al 2015). No deformation was detected at Sabancaya between 2007 and 2011 during a regional ALOS survey of Northern Andes Volcanoes (Morales Rivera et al., 2016). TSX interferograms at Sabancaya showed up to 6 cm of subsidence associated with an earthquake swarm in February 2013 (Jay et al 2015). A Mw 5.9 earthquake on 17 July 2013 was accompanied by up to 5 cm uplift and over 15 cm of subsidence. Aftershocks following the 17 July 2013 earthquake were associated with up to 7 cm of subsidence, and approximately 1 cm of post-seismic subsidence was observed between Nov. 2013 and May 2014 (Jay et al 2015).
References:	'Pritchard, M. E., and M. Simons, 2002. A satellite geodetic survey of large-scale deformation of volcanic centres in the central Andes. Nature, 418, 167-171. https://dx.doi.org/10.1038/nature00872', 'Jay, J. A., Delgado, F. J., Torres, J. L., Pritchard, M. E., Macedo, O., and Aguilar, V., 2015. Deformation and seismicity near Sabancaya volcano, southern Peru, from 2002 to 2015.. Geophysical Research Letters, 42, 2780-2788. https://dx.doi.org/10.1002/2015GL063589', 'Morales Rivera, A. M., F. Amelung, and P. Mothes (2016), Volcano deformation survey over the Northern and Central Andes with ALOS InSAR time series, Geochem. Geophys. Geosyst., 17, 2869–2883, doi:10.1002/2016GC006393. \n'
Location:	-71.857, -15.787