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Abstract

In February 2023, a seismic sequence started with two strong earthquakes occurring on 13 February with Ml = 5.2 and on 14 February with Ml = 5.7 followed by over 500 aftershocks. Therefore, complex measurements took place in the epicentral area and the nearby regions shortly after the sequence started. In order to increase the quality of locations and record low-magnitude events, new seismic stations were installed in the area. The stations are equipped with broadband sensors (CMG40T), short-period sensors (Mark L4C) and accelerometers (Episensor). The recorded data is sent to the National Data Center for analysis in real time. The processing software used by the Romanian Seismic Network is Antelope. Before processing, all the stations are evaluated to check the performance and data quality. We can calculate the Power Spectral Densities (PSD) and Probability Density Functions (PDF) by analyzing the waveform data and the instrument response files. In addition to the seismic stations, two GNSS mobile stations were installed. One Leica GR50 receiver that replaced the old one on our reference GNSS station TIMA in order to have real-time data from the Velocity and Displacement Engine (VADASE system) at 10 Hz integrated into it. The second one was a new installation, with the same capabilities, both being capable and recording static High-Frequencies measurements to determine the crustal deformation rate and direction within the area.