cGPS Record of Active Extension in Moroccan Meseta and Shortening in Atlasic Chains under the Eurasia-Nubia Convergence Chalouan, Ahmed Tendero Salmerón, Víctor Galindo Zaldívar, Jesús cGPS measurement Nubian plate boundary Westernmost Mediterranean Slow active extensional tectonics Anomalous mantle Junta de Andalucia; European Regional Development Fund; grant numbers: AGORA P18-RT-3275. Programa Operativo FEDER-Andalucia 2014–2020 Project ref. 1263446; University of Jaén; CEACTEMA; grant number: POAIUJA 23/24. Junta de Andalucía (Andalusian Board); grant numbers: RNM-148, RNM-282, RNM-370. V.T.S. was supported by the FPU PhD grant (16/04038). The northwest-southeast convergence of the Eurasian and Nubian (African) plates in the western Mediterranean region propagates inside the Nubian plate and affects the Moroccan Meseta and the neighboring Atlasic belt. Five continuous Global Positioning System (cGPS) stations were installed in this area in 2009 and provide significant new data, despite a certain degree of errors (between 0.5 and 1.2 mm year−1, 95% confidence) due to slow rates. The cGPS network reveals 1 mm year−1 North/South shortening accommodated within the High Atlas Mountains, and unexpected 2 mm year−1 north-northwest/south-southeast extensional-to-transtensional tectonics within the Meseta and the Middle Atlas, which have been quantified for the first time. Moreover, the Alpine Rif Cordillera drifts towards the south-southeast against its Prerifian foreland basins and the Meseta. In this context, the geological extension foreseen in the Moroccan Meseta and Middle Atlas agrees with a crustal thinning due to the combined effect of the anomalous mantle beneath both the Meseta and Middle-High Atlasic system, from which Quaternary basalts were sourced, and the roll-back tectonics in the Rif Cordillera. Overall, the new cGPS data provide reliable support for understanding the geodynamic mechanism that built the prominent Atlasic Cordillera, and reveal the heterogeneous present-day behavior of the Eurasia-Nubia collisional boundary. 2023-06-26T08:20:19Z 2023-06-26T08:20:19Z 2023-05-17 journal article Chalouan, A.; Gil, A.J.; Chabli, A.; Bargach, K.; Liemlahi, H.; El Kadiri, K.; Tendero-Salmerón, V.; Galindo-Zaldívar, J. cGPS Record of Active Extension in Moroccan Meseta and Shortening in Atlasic Chains under the Eurasia-Nubia Convergence. Sensors 2023, 23, 4846. [https://doi.org/10.3390/s23104846] https://hdl.handle.net/10481/82793 10.3390/s23104846 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional MDPI