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Abstract:
On February 13, 2023 a significant seismic sequence with two main earthquakes of moment magnitude Mw=4.8 and Mw=5.4, occurred in the proximity of Targu Jiu city (Romania) in the lower crust. The second shock was the largest recorded ever in this area, exceeding the magnitude of 1943 event, having an estimated magnitude of Mw 5.2 for the event occurred on June 20. The second shock was followed by hundred of aftershocks detected and located by the Romanian seismic network. Immediately after the first shock the macroseismic applications implemented by National Institute for Earth Physics (NIEP) were accessed by the observers to record their experiences regarding the felt earthquakes, information used to define the macroseismic field of ground shakings. According to the macroseismic information, the epicentral intensity reached V Mercalli for the first shock and VI Mercalli for the second one, and the seismic events were felt on the extended area (up to a distance of 300 km from the epicenter). The earthquakes caused general panic, but the buildings damages were minor to moderate only. The main purpose of this paper is to investigate the macroseismic effects associated to these earthquakes using the intensity scale in use in order to evaluate the impact on the regional seismic hazard assessment, and to improve fault characterization from the studied area.This paper was carried out within Nucleu Program SOL4RISC, supported by MCI, project no PN23360201 and AFROS Project PN-III-P4-ID-PCE-2020-1361, supported by UEFISCDI
