Fig. 9
Tectonic units of a part of the northern External Dinarides after Schmid et. al. (2020), supplemented by seismicity and focal mechanism solutions (FMS) for events occurred in the study area between 1995 and 2020 (Croatian Earthquake Catalogue, [CEC, Herak et al., 1996, updated until the end of 2020)]. Only earthquakes with local magnitude ML ≥ 1.0 and standard errors of the epicenter and focal depth of σE < 3 km and σH < 4 km, respectively, are shown. The magnitude is displayed by the symbol size, and the depth is color-coded (see the legend). The study area shows an overall low level of seismicity, with several areas of higher activity (e.g. the hanging wall of the Split-Karlovac Fault in the SE, and an active zone along the coast between Gorski Kotar and the Kvarner Gulf in the NW). Beneath Velebit seismicity is bimodal distributed. In the southern Velebit earthquakes are confined to its foreland, whereas the hinterland (Bruvno) is aseismic. This contrasts with the central Velebit, where earthquakes occur mostly in the hinterland. The FMSs show that the southern Velebit foreland is characterized by active thrusting, whereas the area between Kvarner and Gorski Kotar is related to predominantly strike-slip faulting