Research output: Contribution to journal › Article
50 years of steady ground deformation in the Altiplano-Puna region of Southern Bolivia. / Gottsmann, Joachim H; del Potro, Rodrigo; Muller, Cyril S.
In: Geosphere, Vol. 14, No. 1, 02.2018, p. 65-73.Research output: Contribution to journal › Article
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TY - JOUR
T1 - 50 years of steady ground deformation in the Altiplano-Puna region of Southern Bolivia
AU - Gottsmann, Joachim H
AU - del Potro, Rodrigo
AU - Muller, Cyril S
PY - 2018/2
Y1 - 2018/2
N2 - The Altiplano Puna Volcanic Complex of the Central Andes is host to a ~150 km wide, quasi-circular ground deformation anomaly centered on Uturuncu volcano (Bolivia). The precise onset and duration of this deformation is unclear, but geomorphologic studies bracket its initiation at less than a few hundred years ago. Here we report on the deformation history over a ~50 year period by deriving orthometric height changes from leveling and GNSS observations at 53 benchmarks along a regional leveling line that crosses the deformation anomaly. The comparison of InSAR LOS and LOS-projected orthometric ground velocities in a common reference frame reveal central uplift extending to ~35 km from Uturuncu at a maximum orthometric rate of 1.2 cm yr-1, and peripheral subsidence, at a maximum rate of 0.3 cm yr-1 to ~60 km from Uturuncu. This pattern is consistent with the spatial extent and average rate of deformation observed by InSAR. Our interpretation of the data is that long-wavelength ground uplift at Uturuncu has likely occurred at a quasi-constant rate for at least half a century. This study bridges the observational timespans between modern satellite geodetic observations (up to a few decades) and geomorphological observations (few centuries and longer) of the recent deformation history of the continental crust in the Central Andes and adds to a select group of case studies of quantifiable long-term volcano deformation world-wide.
AB - The Altiplano Puna Volcanic Complex of the Central Andes is host to a ~150 km wide, quasi-circular ground deformation anomaly centered on Uturuncu volcano (Bolivia). The precise onset and duration of this deformation is unclear, but geomorphologic studies bracket its initiation at less than a few hundred years ago. Here we report on the deformation history over a ~50 year period by deriving orthometric height changes from leveling and GNSS observations at 53 benchmarks along a regional leveling line that crosses the deformation anomaly. The comparison of InSAR LOS and LOS-projected orthometric ground velocities in a common reference frame reveal central uplift extending to ~35 km from Uturuncu at a maximum orthometric rate of 1.2 cm yr-1, and peripheral subsidence, at a maximum rate of 0.3 cm yr-1 to ~60 km from Uturuncu. This pattern is consistent with the spatial extent and average rate of deformation observed by InSAR. Our interpretation of the data is that long-wavelength ground uplift at Uturuncu has likely occurred at a quasi-constant rate for at least half a century. This study bridges the observational timespans between modern satellite geodetic observations (up to a few decades) and geomorphological observations (few centuries and longer) of the recent deformation history of the continental crust in the Central Andes and adds to a select group of case studies of quantifiable long-term volcano deformation world-wide.
U2 - 10.1130/GES01570.1
DO - 10.1130/GES01570.1
M3 - Article
VL - 14
SP - 65
EP - 73
JO - Geosphere
JF - Geosphere
SN - 1553-040X
IS - 1
ER -