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Abstract:
The Targu-Jiu seismic zone of Romania is well known for the crustal events with moderate magnitude (ML <5) that rarely occurred. The largest event, with an estimated local magnitude of 5.2 and depth of 9.9 km, was recorded in 1943. At that time, seismic monitoring was done with analog instruments and macroseismic observations. At the beginning of 2023, a seismic sequence with main shocks as doublet earthquakes occurred on February 13th and 14th, with local magnitudes of 5.2, respectively 5.7, followed by over 900 aftershocks.When the sequence started, the Targu-Jiu area was monitored by 45 seismic stations of the Romanian Seismic Network (RSN). Therefore, the earthquake parameters were determined accurately. Moreover, for lowering the event magnitude threshold and a better seismic coverage, four more seismic stations were installed in the epicenter area, after the 5.7ML event recorded on February 14th. The main goal of this paper is to highlight the importance of well-distributed seismic stations in the epicenter area and high quality recorded data. To reach the purposes of this study, two different approaches were conducted. Firstly, we used only the stations nearby the epicenter area. Then, we use data recorded by all the RSN stations (over 160 recordings for the 5.7 ML event). The results of this study showed that a better location is obtained when using stations well distributed in the epicentral area.
