Topo-Iberia project: CGPS crustal velocity field in the Iberian Peninsula and Morocco

Gárate, Jorge; Martín-Dávila, J.; Khazaradze, Giorgi; Echeverría, Anna; Asensio, Eva; Gil, A. J.; Lacy, M. C.; Armenteros, Juan Antonio; Ruiz, Antonio M.; Gallastegui, J.; Álvarez-Lobato, F.; Ayala, C.; Rodríguez‐Caderot, G.; Galindo-Zaldı́var, Jesús; Rimi, Abdelkrim; Harnafi, M.

doi:10.1007/s10291-014-0387-3

Cited by 45 publications

(47 citation statements)

References 28 publications

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“…In order to improve the spatial density of the geodetic velocity field over the studied area, we integrated our solutions with those reported in [39,[68][69][70]. In particular, we aligned published solutions to our ITRF2014 one by solving for Helmert transformation parameters that minimize the root mean square (RMS) of differences between velocities at common sites.…”

Section: Gnss Data Processingmentioning

confidence: 99%

Geodetic Deformation versus Seismic Crustal Moment-Rates: Insights from the Ibero-Maghrebian Region

et al. 2020

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Seismic and geodetic moment-rate comparisons can reveal regions with unexpected potential seismic hazards. We performed such a comparison for the Southeastern Iberia—Maghreb region. Located at the western Mediterranean border along the Eurasia–Nubia plate convergence, the region has been subject to a number of large earthquakes (M ≥ 6.5) in the last millennium. To this end, on the basis of available geological, tectonic, and seismological data, we divided the study area into twenty-five seismogenic source zones. Many of these seismogenic source zones, comprising the Western Betics, the Western Rif mountains, and the High, Middle, and Saharan Atlas, are characterized by seismic/geodetic ratio values lower than 23%, evidencing their prevailing aseismic behavior. Intermediate seismic/geodetic ratio values (between 35% and 60%) have been observed for some zones belonging to the Eastern Betics, the central Rif, and the Middle Atlas, indicating how crustal seismicity accounts only for a moderate fraction of the total deformation-rate budget. High seismic/geodetic ratio values (> 95%) have been observed along the Tell Atlas, highlighting a fully seismic deformation.

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Section: Gnss Data Processingmentioning

confidence: 99%

Geodetic Deformation versus Seismic Crustal Moment-Rates: Insights from the Ibero-Maghrebian Region

et al. 2020

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“…deformations have affected even distant areas of the Iberian Peninsula, generating fault reactivation and folds (De Vicente & Vegas, 2009;Jabaloy et al, 2002). Present-day stresses determined from seismic moment tensors, structural data, and velocities from CGPS data vary throughout the cordillera (Fernández-Ibáñez et al, 2007;Galindo-Zaldivar et al, 2015;Garate et al, 2015;Henares et al, 2003;Stich et al, 2006). In some areas, the stresses deduced from seismic data do not fit calculations from outcropping structures, pointing to a vertical variation of present-day stress (Marín-Lechado et al, 2005).…”

Section: 1029/2020tc006143mentioning

confidence: 99%

Seismicity in Strike‐Slip Foreland Faults (Central Betic Cordillera Front): Evidence of Indentation Tectonics

et al. 2020

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Unexpected seismicity has been detected in the past few years along the northern Guadiana Menor River (Guadalquivir foreland basin) at the northern boundary of the Betic Cordillera. Earthquake focal mechanisms evidence the activity of N‐S to NNE‐SSW sinistral faults in the basement. Yet continuous GPS (CGPS) data show a westward movement in both the Prebetic Arc and the eastern Guadalquivir basin infill, which disagrees with the strike‐slip faults. To more precisely describe the structure and evolution of the area, new Bouguer anomaly data from the southeastern basin combined with seismicity data, electric resistivity tomography profiles (ERT), and surface studies are provided. Given the soft consistency of the sedimentary infill in the area, surface evidence of faulting is scarce, limited to elongated channel and minor vertical faults affecting Quaternary sediments, where ERT profiles suggested the presence of faults. These results suggest that the Guadalquivir basin infill, the Prebetic Arc and the central Betic Cordillera move towards the west, independent from the Iberian crust, but indicating to some extent an upward propagation of the basement deformation. However, the basement is coupled with the Alboran Domain and undergoes NNW‐SSE Eurasia‐Nubia convergence and orthogonal extension. This scenario is suggestive of the initial stages of indentation tectonics, better developed in the eastern Betic Cordillera and the central Alboran Sea.

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“…The data from 25 CGPS stations that we have included in our analysis and is not presently open to the public, comes from the Topo-Iberia GPS network, established in 2007 as part of the "Geociencias en Iberia: Estudios integrados de topografía y evolución 4D (Topo-Iberia)" project. For further details on this network the reader is referred to the paper of Garate et al (2014). In this given work we have included a new CGPS station GATA, located at Cabo de Gata (Almeria), which was installed by the UB in 2008 as part of the EVENT project (Khazaradze et al, 2010).…”

Section: Gps Datamentioning

confidence: 99%

“…25 stations (4 in Morocco and 21 Spain) belong to the Topo-Iberia GPS network, established in 2007 (Khazaradze and Topo-Iberia GPS Team, 2009). The official results of this network were presented by Garate et al (2014) recently, where the 3 velocity solutions of the three groups from Real Observatorio de la Armada (ROA), Universities of Jaén and Barcelona were combined. The velocities presented here are based exclusively on the analysis of the UB group, and for this reason in few cases the presented velocity vectors are slightly different from the velocities published in Garate et al (2014).…”

mentioning

confidence: 99%

“…The official results of this network were presented by Garate et al (2014) recently, where the 3 velocity solutions of the three groups from Real Observatorio de la Armada (ROA), Universities of Jaén and Barcelona were combined. The velocities presented here are based exclusively on the analysis of the UB group, and for this reason in few cases the presented velocity vectors are slightly different from the velocities published in Garate et al (2014). In general, the results of this paper are in agreement with the previously published velocities of the Iberian Peninsula and nortern Africa as described by Fernandes et al (2007), Serpelloni et al (2007), Pérez-Peña et al (2010), Koulali et al (2011).…”

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confidence: 99%

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Campo de deformación cortical actual de la Península Ibérica estimado a partir de medidas GPS

2014

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We present the crustal deformation field in the Iberian Peninsula and northern Morocco, based on the analysis of the continuous GPS (CGPS) observations for the last five years, combined with the survey style observations (SGPS) of the CuaTeNeo network in eastern Betics. The analyzed CGPS stations come from several national and regional GNSS networks, with variable monument design and stability. Four CuaTeNeo campaigns were conducted with approximately a 4-year interval from 1997 to 2011. Although the calculated deformation field is complex, some expected features could be easily identified. Considering the Eurasia fixed frame, the highest velocities, as expected, are observed in Morocco, where the velocities reach 4.7±0.2 mm/yr. In southern Spain, stations located west of Almeria exhibit a westerly trend of motion, which reach 3.2±0.1 mm/yr at station SFER. The direction of these vectors makes us think that the main driving force behind the observed deformations cannot be solely attributed to the Africa-Eurasia convergence, but it should be due to the deeper geodynamic processes related to the subduction of the Betic-Alboran slab.

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Topo-Iberia project: CGPS crustal velocity field in the Iberian Peninsula and Morocco

Cited by 45 publications

References 28 publications

Geodetic Deformation versus Seismic Crustal Moment-Rates: Insights from the Ibero-Maghrebian Region

Geodetic Deformation versus Seismic Crustal Moment-Rates: Insights from the Ibero-Maghrebian Region

Seismicity in Strike‐Slip Foreland Faults (Central Betic Cordillera Front): Evidence of Indentation Tectonics

Campo de deformación cortical actual de la Península Ibérica estimado a partir de medidas GPS

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