## 1 Introduction  
The study and understanding of active tectonics provide the scientific community with information on the movement of Earth's plates. In this way, the monitoring of Global Navigation Satellite Systems (GNSS) signals through geodetic receivers in permanent monuments is the most accurate technique for the study and analysis of ground deformations in these hard-to-reach areas. The Eurasia-Nubian plate convergence zone is an area of great interest due to its high geodynamic activity. The Strait of Gibraltar, the Alboran Sea domain, the Maghrebides, and the Betic Cordilleras are clear examples of this complex structure (Figure 1). This area is a North-South convergence zone of diffuse tectonics between the African and Eurasian plates whose limit is still under discussion [1]. Currently, the convergence between both plates is evolving in a NW-SE direction with an approximate rate of 4-5 nm per year [2; 3; 4; 5; 6; 7; 8; 9; 10; 11]. The most updated studies in the GNSS field in this region, mainly in North Africa, include campaigns with data from continuous stations up to 2014, such as those presented in the Topo-Iberia project [10]. The rest of the studies have been carried out with episodic campaigns, for example [2; 4; 16; 17], which could present significant drawbacks compared to continuous stations, mainly in the lack of data continuity, lower precision, and inability to monitor short-term phenomena or provide real-time data. Figure 1: Topographic/bathymetric map [12] of the western Mediterranean (WM). In black, the possible diffuse zone of the EURA-NUBIA convergence between North Africa and the south of the Iberian Peninsula is shown according to this study. Three possible hypotheses of the delimitation of this zone are drawn according to [13] in red, [14] in yellow, and [15] in blue. Within the confluence zone of the EURA-NUBIA, the active region between the Betics Mountain range and the northern Alboran Sea has been well defined by several studies that explain the tectonic behavior [17; 18; 19; 20; 21; 22; 23]. Those studies show, in general, that the velocity field in the Iberian Peninsula from the north of Betics mountain range forms part of the stable Eurasian plate, with a residual movement between 2 and 3 mm per year. Because of these exhaustive scientific studies, the deformation patterns and geodynamics of this area of the Gibraltar Arc are quite well established in areas of interest such as the Campo de Dalias [16], Granada Basin [21], or the eastern shear zone of the Betics Cordillera [20; 22]. For the other part in Morocco, while the Rif can be considered within this diffuse zone, the Atlas Mountains' range is already at the limit of the North African plate, according to recent studies in this region [10; 18; 24; 25; 26]. Furthermore, the stresses between plates are not accommodated in the same way, with the North African contact zone being the most active [19; 20]. This shows a clear example of a complex incidence model that makes it possible to accommodate deformations. The Royal Institute and Observatory of the Spanish Navy (ROA) is currently committed to maintaining continuous GNSS stations in the south of Spain and North Africa. For this purpose, precise geodetic devices were installed at strategic and interesting points, as seen in Figure 2. In addition, the maintenance of its own station is inherited from the Topo-Iberia Project [27], of which only the Tiouine (Station of TIOU) is preserved. At present, there are no other continuous GNSS networks in this interesting area of study. The interpretation of the data processed can contribute useful information to clarify the behavior of this confusing and poorly monitored region, as well as complement several previous studies, such as those cited above. The objective of this paper is to present a new velocity field calculated from continuous GNSS stations located in southern Spain and North Africa. This velocity field includes, for  
Figure 2: Map of stations used in the research.