Insights of Active Extension Within a Collisional Orogen From GNSS (Central Betic Cordillera, S Spain)
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Martin Rojas, I.; Galindo Zaldívar, Jesús; Sanz de Galdeano, Carlos; Ruano Roca, Patricia; Tendero Salmerón, Víctor; Madarieta Txurruka, Asier; Pedrosa González, María TeresaEditorial
Wiley
Date
2023-06-13Referencia bibliográfica
Martin-Rojas, I., Alfaro, P., Galindo-Zaldivar, J., Borque-Arancón, M. J., García-Tortosa, F. J., Sanz de Galdeano, C., et al. (2023). Insights of active extension within a collisional orogen from GNSS (Central Betic Cordillera, S Spain). Tectonics, 42, e2022TC007723. [https://doi. org/10.1029/2022TC007723]
Sponsorship
The Generalitat Valenciana (Valencian Regional Government; Research project AICO/2021/196), Spanish Ministry of Science; Innovation and University (Research Projects RTI2018-100737- B-I00 and PID2021-127967NB-I00),; The University of Alicante (Research Project VIGROB053); The University of Jaén (POAIUJA 2021–2022, CEACTEMA and Programa Operativo FEDER Andalucía, 2014–2020—call made by UJA, 2018, Ref. 1263446), P18-RT- 3275 (Junta de Andalucía/FEDER),; Junta de Andalucía regional government (RNM282 and RNM 148 research groups); The Institut Cartogràfic Valencià, Agencia Valenciana de Seguridad y Respuesta a las Emergencias (Generalitat Valenciana); Consorcio Provincial para el Servicio de Prevención y Extinción de Incendios y Salvamento de Alicante; Diputaciones Provinciales de Alicante y Castellón; Ayuntamiento de AlmoradíAbstract
The coexistence of shortening and extensional tectonic regimes is a common feature in orogenic
belts. The westernmost end of the Western Mediterranean is an area undergoing shortening related to the 5 mm/
yr NNW‒SSE convergence of the Nubia and Eurasia Plates. In this region, the Central Betic Cordillera shows
a regional ENE‒WSW extension. Here, we present GNSS-derived geodetic data along a 170 km-long transect
orthogonal to the main active normal faults of the Central Betic Cordillera. Our data indicate that the total
extension rate along the Central Betic Cordillera is 2.0 ± 0.3 mm/yr. Extension is accommodated in the eastern
(0.8 ± 0.3 mm/yr in the Guadix-Baza Basin) and western (1.3 ± 0.3 mm/yr in the Granada Basin) parts of the
Central Betic Cordillera, while no extension is recorded in the central part of the study area. Moreover, our
data permit us to quantify, for the first time, short-term fault slip rates of the Granada Fault System, which is
one of the main seismogenic sources of the Iberian Peninsula. We deduce a fault slip rate of ∼1.3 ± 0.3 mm/
yr for the whole Granada Basin, with 0.9 ± 0.3 mm/yr being accommodated in the Granada Fault System and
0.4 ± 0.3 mm/yr being accommodated in the southwestern sector of the Granada Basin, where no active faults
have been previously described at the surface. The heterogeneous extension in the Central Betic Cordillera
could be accommodated by shallow high-angle normal faults that merge with a detachment at depth. Part of the
active extension could be derived from gravitational instability because of underlying over-thickened crust