Figure 2. Zoom on the western part of the route showing the global positioning system velocities (black arrows) and relative errors (ellipses). The yellow polygons represent the horizontal projection of the seismogenic sources provided in Greek Database of Seismogenic Sources (Caputo and Pavlides, 2013), where the thick border indicates their upper tip projection (red, green, and blue correspond to a prevailing reverse, strike-slip, and normal kinematics, respectively). For the sake of graphical simplicity, the seismogenic sources cited in the text are labeled with only the numerical part, whereas the country code (AL and GR) and the source code (CS for composite source or IS for individual source) are omitted. Location map in Figure 1. The purple arrows indicate the Ohrid Graben and the Ptolemaida Graben, cited in the text. Details on the Nubia–Eurasia rotation pole are in Pérouse et al. (2012). Black labels are global navigation satellite system station names. AG = from D’Agostino et al. (2008, 2011); FL = from Floyd et al. (2010); FYROM = former Yugoslav Republic of Macedonia; M = from Kotzev et al. (2006); RE = from Reilinger et al. (2006).