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Open AccessArticle

Unrest at Domuyo Volcano, Argentina, Detected by Geophysical and Geodetic Data and Morphometric Analysis

1
Laboratorio de Geodinámica, IDEAN, Universidad de Buenos Aires, CONICET, C1428EGA Buenos Aires, Argentina
2
GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
3
Instituto Geofísico Sismológico Ing. Volponi, Universidad Nacional de San Juan, 5407 San Juan, Argentina
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(18), 2175; https://doi.org/10.3390/rs11182175
Received: 30 June 2019 / Revised: 12 September 2019 / Accepted: 13 September 2019 / Published: 18 September 2019
New volcanic unrest has been detected in the Domuyo Volcanic Center (DVC), to the east of the Andes Southern Volcanic Zone in Argentina. To better understand this activity, we investigated new seismic monitoring data, gravimetric and magnetic campaign data, and interferometric synthetic aperture radar (InSAR) deformation maps, and we derived an image of the magma plumbing system and the likely source of the unrest episode. Seismic events recorded during 2017–2018 nucleate beneath the southwestern flank of the DVC. Ground deformation maps derived from InSAR processing of Sentinel-1 data exhibit an inflation area exceeding 300 km2, from 2014 to at least March 2018, which can be explained by an inflating sill model located 7 km deep. The Bouguer anomaly reveals a negative density contrast of ~35 km wavelength, which is spatially coincident with the InSAR pattern. Our 3D density modeling suggests a body approximately 4–6 km deep with a density contrast of –550 kg/m3. Therefore, the geophysical and geodetic data allow identification of the plumbing system that is subject to inflation at these shallow crustal depths. We compared the presence and dimensions of the inferred doming area to the drainage patterns of the area, which support long-established incremental uplift according to morphometric analysis. Future studies will allow us to investigate further whether the new unrest is hydrothermal or magmatic in origin. View Full-Text
Keywords: Domuyo Volcanic Center; InSAR; magma body; geothermal unrest; 3D density model; Bouguer Anomaly; volcanic source geometry modeling Domuyo Volcanic Center; InSAR; magma body; geothermal unrest; 3D density model; Bouguer Anomaly; volcanic source geometry modeling
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Astort, A.; Walter, T.R.; Ruiz, F.; Sagripanti, L.; Nacif, A.; Acosta, G.; Folguera, A. Unrest at Domuyo Volcano, Argentina, Detected by Geophysical and Geodetic Data and Morphometric Analysis. Remote Sens. 2019, 11, 2175.

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