RT journal article
T1 GNSS-Based Models of Displacement, Stress, and Strain in the SHETPENANT Region: Impact of Geodynamic Activity from the ORCA Submarine Volcano
A1 Rosado Moscoso, Belén
A1 Jiménez, Vanessa
A1 Pérez Peña, Alejandro
A1 Martín, Rosa
A1 de Gil, Amos
A1 Carmona Medeiro, Enrique
A1 Gárate, Jorge
A1 Berrocoso Domínguez, Manuel
A2 Matemáticas
K1 GNSS system
K1 geodetic time series
K1 geodynamic
K1 volcano–tectonic deformation
K1 ORCA volcano
AB The South Shetland Islands and Antarctic Peninsula (SHETPENANT region) constitutea geodynamically active area shaped by the interaction of major tectonic plates and activemagmatic systems. This study analyzes GNSS time series spanning from 2017 to 2024 toinvestigate surface deformation associated with the 2020–2021 seismic swarm near the Orcasubmarine volcano. Horizontal and vertical displacement velocities were estimated for thepreseismic, coseismic, and postseismic phases using the CATS method. Results reveal significant coseismic displacements exceeding 20 mm in the horizontal components near Orca,associated with rapid magmatic pressure release and dike intrusion. Postseismic velocitiesindicate continued, though slower, deformation attributed to crustal relaxation. Stationslocated near the Orca exhibit nonlinear, transient behavior, whereas more distant stationsdisplay stable, linear trends, highlighting the spatial heterogeneity of crustal deformation.Stress and strain fields derived from the velocity models identify zones of extensional dilatation in the central Bransfield Basin and localized compression near magmatic intrusions.Maximum strain rates during the coseismic phase exceeded 200 νstrain/year, supportinga scenario of crustal thinning and fault reactivation. These patterns align with the knownstructural framework of the region. The integration of GNSS-based displacement and strainmodeling proves essential for resolving active volcano-tectonic interactions. The findingsenhance our understanding of back-arc deformation processes in polar regions and supportthe development of more effective geohazard monitoring strategies.
PB Multidisciplinary Digital Publishing Institute (MDPI)
SN 2072-4292
YR 2025
FD 2025
LK http://hdl.handle.net/10498/39345
UL http://hdl.handle.net/10498/39345
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026