On April 22nd, 2022, an earthquake of local magnitude ML = 6.0 occurred in the southern part of Bosnia and Herzegovina near Berkovići, with an estimated maximum intensity of I0 = VII °EMS. The earthquake series in Berkovići followed a few months after the installation of a seismic network in the wider area, which was subsequently expanded. The data collected from these stations enable a more comprehensive analysis of the earthquake series and the activated fault system. In this study, template matching was employed to expand the earthquake catalog based on automatic phase and event detections. The idea behind the method is to use known earthquakes as templates to search for similar events in seismograms. The analysis covers a period of three months after the initial earthquake and an area with a radius of 25 km from the epicenter of the main earthquake series in Berkovići, totaling 5 331 earthquakes. Templates used for matching have magnitudes M ≥ 2.0. The result is a list of detections with recorded phases, and their locations were determined using a program using nonlinear methods for hypocenter determination. Application of template matching results in 166 295 detections, which is 31 times more compared to the initial catalog. Locations cannot be obtained for all detections due to a lack of recorded phases, but they are obtained for four times more events than in the initial catalog (24 096). However, the catalog encompasses four times fewer events than in the detection list. The locations correspond to those in the initial catalog, although there is a smaller dispersion around the epicenter in the new catalog. Depths of earthquake foci are mainly between 10 and 20 kilometers. The algorithm exhibits the highest efficiency in the first month after the earthquake, but throughout the entire time period, it leads to a higher number of detections compared to manual recording. This is one of the advantages of such an automated method, along with its speed in processing large amounts of data. Further research should involve calculating earthquake magnitudes and exploring different parameter versions in the used method or location program.