The precise location of earthquakes is very important for determining essential information about the earthquake, features of the earthquake focus, quick assessment of the seismic hazard and further tectonic interpretations, as well as future assessments of the seismic hazard. However, in order to assess the seismic hazard as well as possible, prior knowledge of the geodynamics and geology of the observed area and its seismic history is required. The city of Zagreb and the wider Zagreb area belong to a seismically active area, and the seismic history of the researched area can be traced back to the 16th century. The last significant earthquake of magnitude 5.3 in this area occurred on March 22, 2020. After the main earthquake in 2020, a series of earthquakes occurred in the wider Zagreb area. In the paper, an analysis of automatic earthquake detection based on continuous records of ground shaking at a set of stations, automatic determination of P and S wave arrivals and maximum amplitude at a particular phase, and automatic location of hypocenters of the Zagreb series of earthquakes from 2020 using the SEISAN software package was made. Based on the conducted research, it can be concluded that the automatic detection and location of earthquake hypocenters greatly reduces the processing time of huge amounts of data from a few months to a few days.