## 3 Geological Data Interpretation  
In the Republic of Croatia, new data were collected on the directions and amplitudes of movements at individual geodetic points. In Figure 2, the directions of the velocities determined at the geodetic stations are slightly different in some parts of the covered area. Most importantly, the movements at particular stations point to the constantly present tectonic activity and the regional shifting of particular parts of the geological structural settings. In comparing the obtained geodetic and known geological data, the determination of the causes of recent tectonic activity is emphasized, especially the selection of the most active structures and spaces in which seismic activity can be expected. First of all, it should be pointed out that the most common directions of movement, determined at individual geodetic points, are north-northeast (NNE) and northeast (NE), but also with the directions of the north (N) and north-northwest (NNW), are predominantly in the western part of the covered area. There are also changes observed in the narrower areas, most often from the NNE direction to N and NNW, such as around Zadar, Rijeka, and Ljubljana. The obtained data were compared with the characteristics of the regional and local geological structural setting and especially with the present seismotectonic activity. Figure 2: Relative velocity vectors (horizontal component v\({}_{\rm H}\)) of 83 stations for the territory of Croatia, Slovenia, Hungary, and Montenegro concerning station GRAZ (all velocity vectors have the same scale). CRODYN includes the Croatian stations that are most frequently observed in campaigns from Table 1.  
In the process of collecting the necessary data, the most important knowledge, and particularly the latest developments concerning the recent structural setting, tectonic movements, faults, and movements of parts of the structures were taken into account [6; 8; 12; 14; 15; 16; 17; 19]. Some details were also collected in previous studies of seismotectonic activity [13; 14; 15; 26; 59]. The most important data were obtained from recent work that directly considered the geodynamic processes in the observed area [2; 28; 30; 31; 32; 35; 36; 38; 39]. Geological structural relationships need to be highlighted first. Figure 3 shows marked regional geological structural units, the most important faults, and the movement directions of the surface parts of the structure according to the geological data. Figure 3: Recent geological structure setting and basic directions of movement of structural parts along the surface according to geological data. Legend: 1—Regional geological structural units: a—Adriatic microplate (AMP) and Adriatic unit (A); b—Southern Alps (SA), Prelaps (AF), and Sava faults (SF); c—Dinarides: Dinaric and Supradinaric (SD); d—Pannonian Basin: Western (WPB), Southern (SPB), and Central part (CPB); 2—The most important faults bordering regional structural units: Trieste–Ucka–Vis fault (1), Vis–South Adriatic fault (2), Postojna–Rijeka–Vinodol fault and extension, Velebit–Sinj fault (3), Moser–Biokovo–Dubrovnik fault (4), Fela-Sava fault and continuation, Ljubljana–Karlovac–Slunj fault (5), southern boundary fault of the Pannonian Basin (6), fault of the Southern Alps (7), Zagreb fault (8), Periadriatic fault and continuation and Drava fault (9), Sava fault (10), Zagreb–Vinkovci fault (11), and Barcès-Baranja fault (12); 3—other important faults; 4—reverse faults; 5—faults of indeterminate character; 6—direction of horizontal movement along the fault; and 7—direction of movement of structure parts along the surface according to geological data; 8—earthquake epicentres, intensity IX and X, yr. 361–1900; 9—earthquake epicentres yr. 1901–1970, M 5.7-6.1 and M 6.2-6.6; 10—earthquake epicenter M 6.2, south of Zagreb in 2020. The most crucial point that should be emphasized is the existence of reverse structures in the Dinarides (D, SD), Alps (SA, AF), and Adriatic (A) regional structural unit.