Geodetic fault slip rates on active faults in the Baza sub-Basin (SE Spain): Insights for seismic hazard assessment

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Title: Geodetic fault slip rates on active faults in the Baza sub-Basin (SE Spain): Insights for seismic hazard assessment
Authors: Alfaro García, Pedro | Sánchez Alzola, Alberto | Martin-Rojas, Ivan | García Tortosa, Francisco Juan | Galindo Zaldívar, Jesús | Avilés, Manuel | López Garrido, Ángel Carlos | Sanz de Galdeano, Carlos | Ruano, Patricia | Martínez-Moreno, Francisco José | Pedrera, Antonio | Lacy, Clara de | Borque Arancón, María Jesús | Medina-Cascales, Iván | Gil Cruz, Antonio José
Research Group/s: Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Keywords: Active Tectonics | Betic Cordillera | Kinematic coherence | GPS
Knowledge Area: Geodinámica Interna
Issue Date: Mar-2021
Publisher: Elsevier
Citation: Journal of Geodynamics. 2021, 144: 101815.
Abstract: One of the most significant parameters for seismic hazard assessment analyses is the fault slip rate. The combination of both geological (long-term) and geodetic (short-term) data offers a more complete characterization of the seismic potential of active faults. Moreover, geodetic data are also a helpful tool for the analysis of geodynamic processes. In this work, we present the results of a local GPS network from the Baza sub-Basin (SE Spain). This network, which includes six sites, was established in 2008 and has been observed for seven years. For the first time, we obtain short-term slip rates for the two active faults in this area. For the normal Baza Fault, we estimate slip rates 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. Our GPS study shows a discrepancy for the Baza Fault between the short-term slip rates and previously reported long-term rates. This discrepancy indicates that the fault could be 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 GPS-related slip rates form the basis for future seismic hazard analysis in this area. Our results have further implications, as they indicate 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.
Sponsor: This research was funded by the Spanish Ministry of Science, Innovation and University (Research Projects: RTI2018-100737-B-I00 and CGL2016-80687-R), the University of Alicante (Research Project: VIGROB053), the University of Jaén (PAIUJA 2019-2020 and Programa Operativo FEDER Andalucía 2014-2020 - call made by UJA 2018), the University of Granada (B-RNM-301-UGR18) and the Junta de Andalucía regional government (RNM148, RNM282, and RNM370 and P18-RT-3275 research groups).
ISSN: 0264-3707 (Print) | 1879-1670 (Online)
DOI: 10.1016/j.jog.2021.101815
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (
Peer Review: si
Publisher version:
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