EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Kinematic and tectonic analysis of the Baza and Galera Fault (S Spain). Insights from GNSS data

Frank García-Tortosa1, Pedro Alfaro2, Alberto Sánchez-Alzola3, Ivan Martin-Rojas2, Jesus Galindo-Zaldívar4, Manuel Avilés5, Angel Carlos López Garrido6, Carlos Sanz de Galdeano6, Patricia Ruano4, Francisco Jose Martínez-Moreno4, Antonio Pedrera7, Maria Clara de Lacy5, Maria Jesus Borque5, Ivan Medina-Cascales2, and Antonio Jose Gil5
Frank García-Tortosa et al.
  • 1Departamento de Geología, Facultad de Ciencias, Universidad de Jaén, 23071 Jaén, Spain
  • 2Departamento de Ciencias de la Tierra y del Medio Ambiente, Facultad de Ciencias, Universidad de Alicante, 03080 Alicante, Spain
  • 3Departamento de Estadística e Investigación Operativa, Universidad de Cádiz, 11510 - Puerto Real, Spain
  • 4Departamento de Geodinámica, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain
  • 5Departamento de Ingeniería Cartográfica, Geodésica y Fotogrametría, Universidad de Jaén, Campus de las Lagunillas, 23071 Jaén, Spain
  • 6Instituto Andaluz de Ciencias de la Tierra (CSIC-Univ. de Granada), 18071 Granada, Spain
  • 7Instituto Geológico y Minero de España, Ríos Rosas, 23, 28760 Madrid, Spain

We here discuss the results of a local GNSS episodic network from the Baza sub-Basin (S Spain). This network including six sites, was established in 2008 and has been measured seven times since then. Our data permit us to present the first short-term slip rates for the two active faults in this area. The main active structure is the normal Baza Fault. We estimate slip rates for this fault ranging between 0.3±0.3 mm/yr and 1.3±0.4 mm/yr. For the strike-slip Galera Fault, we quantify the slip rate as 0.5±0.3 mm/yr. These values are higher than previously reported long-term slip rates. We postulate that the discrepancy for the Baza Fault between short-term and long-term slip rates could indicate that the fault is presently in a period with a displacement rate higher than the mean of the magnitude 6 seismic cycle. Moreover, the velocity vectors that we obtained also show the regional tectonic significance of the Baza Fault, as this structure accommodates one-third of the regional extension of the Central Betic Cordillera.

Our results also show that the Baza and Galera Faults are kinematically coherent and they divide the Baza sub-Basin into two tectonic blocks. This points to a likely physical link between the Baza and Galera Faults; hence, a potential complex rupture involving both faults should be considered in future seismic hazard assessment studies.

How to cite: García-Tortosa, F., Alfaro, P., Sánchez-Alzola, A., Martin-Rojas, I., Galindo-Zaldívar, J., Avilés, M., López Garrido, A. C., Sanz de Galdeano, C., Ruano, P., Martínez-Moreno, F. J., Pedrera, A., de Lacy, M. C., Borque, M. J., Medina-Cascales, I., and Gil, A. J.: Kinematic and tectonic analysis of the Baza and Galera Fault (S Spain). Insights from GNSS data, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-5479,, 2022.