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  New insight on the large-scale ground deformation at Uturuncu Volcano (Bolivia) from GPS and microgravity data

Castro-Melgar, I., Eiden, E., Pritchard, M., Gottsmann, J. (2023): New insight on the large-scale ground deformation at Uturuncu Volcano (Bolivia) from GPS and microgravity data, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2500

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018255 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018255_2
Genre: Conference Paper

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 Creators:
Castro-Melgar, Ignacio1, Author
Eiden, Elizabeth1, Author
Pritchard, Matthew1, Author
Gottsmann, Joachim1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Uturuncu volcano in Bolivia is a 6008m high stratovolcano located above the Altiplano-Puna Magma Body (APMB), the world’s largest zone of silicic partial melt. Uturuncu forms part of the Altiplano-Puna volcanic complex (APVC) and has not had eruptions in the past 250ka. However, Uturuncu sits in the centre of a ~150 km wide deformation anomaly with at least 50 years of instrumented records of uplift from levelling, Global Navigation Satellite Systems and satellite remote sensing. Synthetic Aperture Radar interferograms indicate a mean maximum rate of uplift along the satellites' line-of-sight of 1cm/yr between 1992 and 2011, followed by a decrease in mean maximum velocities to values of ~0.3cm/yr. Three-component GPS data from a site located at ~5500 m elevation on the western slopes of Uturuncu corroborates satellite-based data. Here we present campaign-style GNSS measurements collected at 11 stations between March 2010 and November 2022 during seven joint and simultaneous microgravity and GNSS surveys along a 65 km long east-west transect from Laguna Celeste located to the east of Uturuncu to Laguna Colorada located to the west. The results enable us to constrain the three-dimensional displacement field of the deformation anomaly and tackle ambiguities from interferometric data regarding north-south displacements across the main area of uplift. Additionally, microgravimmetric data can be updated for measured vertical displacements and compared to results obtained from inferred displacements from satellite data. This will allow us to put further constraints on the driving mechanisms behind the enigmatic ground deformation in the Altiplano-Puna region of southern Bolivia.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-2500
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -