## 2 Geodynamic Framework  
The Republic of Croatia is a member country of the European Union situated in the southern part of Europe, on the eastern coast of the Adriatic Sea. As for its location, the country lies in a very seismically active area due to continuous movement of the Adriatic lithospheric microplate to the North [29]. Although Croatia comprises five different tectonic settings: the Pannonian Basin, the Eastern Alps, the Dinarides, the transition zone between the Dinarides and the Adriatic plate, and the Adriatic micro plate itself [30], it has been divided in 17 seismic zones for a detailed assessment of the seismic hazard [31], shown in Figure 1. Additionally, the faults across Croatia, derived from the European Database of Seismogenic Faults (EDSF), model FSBG V6.1 [32], are presented in the Figure 1. Seismicity source in Croatia is mainly twofold: On its coastal side, the country lies on the border of Micro Adriatic tectonic plate [33] and the mountainous chain of the Dinarides which collide [34; 35] while on the inland country side, the active faults cross over the middle part of the country and belong to the Pannonian Basin fault zone. Micro Adriatic tectonic plate and its movement have not been completely discovered yet. Although it was first mentioned by [PERSON] in 1972 [38], the first far-reaching geodetic researches of its movement were made in the 90s. [PERSON] [39] made the first space geodetic measurements of the Adriatic micro plate using VLBI data. Other studies ([PERSON] et al. [40], [PERSON] et al. [29], [PERSON] et al. [41], [PERSON] et al. [42] [PERSON] et al. [43], [PERSON] et al. [44], [PERSON] et al. [45]) analyzed the movement based on GPS measurements but with different approaches: Their divergence was about the size of the plate and the position of the pole of rotation for velocity vector. The latest studies predict convergence of the Adriatic micro plate in the Dinarids at a rate of velocity vectors of \(<\)5 mm/yr [46]. Regarding the position and the size of the Adriatic micro plate, [PERSON] [47] recently tried to determine it, but he found it too complex to be determined. Instead, he has defined it as a consistent block, surrounded by the Apennine-Adriatic-Dinarids block, not supporting the idea of the plate floating northwards or the idea of its collision in the zone between the Africa and Europe. Hence, the Adriatic micro plate exists, it has its own movement, the studies determine its velocity vectors, but its final size is still not known. Recent studies ([33; 48; 49]) agree upon the thesis that the micro Adriatic plate is responsible for a present tectonic evolution of mountainous area of the Dinarides along the Croatian coast. In the middle continental part of the country, a fault running through the country is a southern marginal fault of the Pannonian Basin [50] which continues to run southward to Banja Luka fault in Bosnia and Herzegovina. The Pannonian Basin is often neglected since the most seismic events do occur at the coastal part of Croatia, and there is no record of strong earthquake on that area until XIX century. First recorded earthquake greater than VII MCS happened in 1861 [51]. However, the Pannonian fault area has become well known in the seismic community due to [PERSON] research made exactly in that area after the Kupa valley earthquake in 1909. At that time, [PERSON] proved the existence of a boundary-level Moho discontinuity, between the Earth's crust and its mantle [52]. It was also the time when [PERSON] proposed a procedure for unique location of earthquake focus and the analytical expression for the increase of elastic wave velocity with depth, so called Mohorovic's law [53]. Kupa valley earthquake was the strongest earthquake on the Pannonian basin area that occurred before the Petrinja 2020 event. Its epicenter was located 9 km North of Pokupsko with magnitude of M\({}_{w}\)5.8, and the hypocentral depth of 14 km [54]. The estimated intensity was VIII\({}_{\Box}\) MCS.