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Strain partitioning in SE Spain. Insights from cGNSS data

Authors

Martin-Rojas,  Ivan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sánchez-Alzola,  Alberto
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Medina-Cascales,  Ivan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Borque-Arancón,  MarIa Jesús
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Alfaro,  Pedro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gil-Cruz,  Antonio José
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Martin-Rojas, I., Sánchez-Alzola, A., Medina-Cascales, I., Borque-Arancón, M. J., Alfaro, P., Gil-Cruz, A. J. (2023): Strain partitioning in SE Spain. Insights from cGNSS data, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3122


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020457
Abstract
We present continuous GNSS data (cGNSS) from SE Spain. We use in this work a total of 11 cGNSS stations located in the Murcia and Valencia regions (ALBA, UTIE, AYOR, VCIA, JUMA, ALCO, DENI, MCIA, CARG, SALI, and TORR). From the site position time series we obtained absolute velocity vectors. To discuss the meaning of this vectors in terms of present deformation, we calculated residual velocity field with respect the mean of two of the stations of our network (ALBA and AYOR). Furthermore, we also projected the residual velocity vectors along the N070E and N340E directions, i.e., sub-parallel and sub-perpendicular to the regional maximum shortening direction.Our results indicate that the southernmost part of SE Spain (Murcia coast) is presently undergoing a shortening rate of 1.23±0.04 mm/yr along the N340W direction (CARG and MCIA stations). Only one major active fault has been defined in this area (Carrascoy Fault). This fault accommodates 0.7±0.2 mm/yr of N340W shortening. Therefore, the rest of our computed shortening (ca. 0.5 mm/yr) must be accommodated out of this structure.In the northeastern part of SE Spain, the comparison between coastal stations (DEN, VCIA) and inland stations (ALCO and AYOR) indicates 0.90±0.06 mm/yr of NE-SW extension. No major active fault has been previously described in this area.