How Much Nubia‐Eurasia Convergence Is Accommodated by the NE End of the Eastern Betic Shear Zone (SE Spain)? Constraints From GPS Velocities

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Title: How Much Nubia‐Eurasia Convergence Is Accommodated by the NE End of the Eastern Betic Shear Zone (SE Spain)? Constraints From GPS Velocities
Authors: Borque Arancón, María Jesús | Sánchez Alzola, Alberto | Martin-Rojas, Ivan | Alfaro García, Pedro | Molina-Palacios, Sergio | Rosa Cintas, Sergio | Rodríguez-Caderot, Gracia | Lacy, Clara de | Avilés, Manuel | Herrera-Olmo, Antonio | García Tortosa, Francisco Juan | Estévez Rubio, Antonio | Gil Cruz, Antonio José
Research Group/s: Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante | Grupo de Ingeniería y Riesgo Sísmico (GIRS) | Didáctica de las Ciencias y la Tecnología
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente | Universidad de Alicante. Departamento de Didáctica General y Didácticas Específicas
Keywords: Crevillente Fault | Bajo segura Fault
Knowledge Area: Geodinámica Interna | Física de la Tierra | Didáctica de las Ciencias Experimentales
Issue Date: May-2019
Publisher: American Geophysical Union
Citation: Tectonics. 2019, 38(5): 1824-1839. doi:10.1029/2018TC004970
Abstract: We present the first GPS‐derived geodetic observations from the NE end of the Eastern Betic Shear Zone obtained from the Bajo Segura GPS network (SE Spain). The network has 11 GPS sites and was sampled four times between 1999 and 2013. Despite the low signal‐to‐noise ratio of the residual velocities obtained, the velocities are nonzero at 95% confidence level. We postulate that the GPS data point to the partitioning of deformation into the NNW–SSE shortening and a N70E left‐lateral component. The maximum deformation rates are located along the two main active faults in the study area. The maximum shortening rates (north component) in the southern region of the Bajo Segura Basin vary from west to east, ranging from 0.2 to 0.7 mm/year along the Bajo Segura Fault Zone. On the northern border of the basin, along the Crevillente Fault Zone, left‐lateral displacement varies between 0.4 and 0.7 mm/year in the E‐W direction. The GPS‐based regional geodynamic models of the Western Mediterranean indicate that the residual shortening of the Eurasia‐Nubia plate convergence is accommodated in the eastern part of the Iberian Peninsula and the Algero‐Balearic Basin. Our results indicate that part of this residual deformation occurs at the NE end of the Eastern Betic Shear Zone, but significant deformation must be accommodated also to the north (External Betics) and to the south (Cartagena Basin and offshore area). We postulate that Eurasia‐Nubia plate convergence is transferred to the Eastern Betics because of the thin and rigid (potentially oceanic) crust of the Algero‐Balearic Basin, which acts as an indenter.
Sponsor: This research was funded by the Spanish Ministry of Economy and Competitiveness (research project CGL2011‐30153‐C02‐02), University of Alicante (research project VIGROB053), University of Jaén (PAIUJA 2019/2020, CEACTierra), and RNM282 Research Group of Junta de Andalucía.
ISSN: 0278-7407 (Print) | 1944-9194 (Online)
DOI: 10.1029/2018TC004970
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019. American Geophysical Union
Peer Review: si
Publisher version:
Appears in Collections:INV - GEODIN - Artículos de Revistas
INV - GIRS - Artículos de Revistas
INV - CYT - Otros Trabajos de Investigación

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