Database of the 2023 seismic sequence recorded in Gorj area (Romania)
Description
An intense seismic sequence occurred in 2023 in Gorj area (Romania), part of the Central Southern Carpathians seismic zone, having a doublet as main shocks. The first one, with a local magnitude of 5.2, was recorded on February 13 at 14:58:09 UTC, and the second one, with a local magnitude of 5.7, was recorded the next day at 13:16:52 UTC. The data was processed using recordings from the Romania Seismic Network [1] and AdriaArray Temporary Network [2, 3]. This database contains the parameters of the two main shocks and over 4000 aftershocks as recorded and located up to 31/12/2023. The table includes a column which represents the number of seismic phases used to locate the event (Nph), a column that indicates the number of seismic stations used to locate the event (Nst), and a column that specifies the number of stations used in computing the local magnitude (ML) of the event (Nmg).
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Steps to reproduce
The earthquake parameters were compiled using the LOCSAT algorithm [4] incorporated in the Antelope™ (BRTT) software [5] and the IASP91 velocity model [6]. Furthermore, for event location, only stations within a 200 km epicentral distance were used. Details about data acquisition, location, and magnitude estimation (ML) can be found in the paper by Ionescu et al. [7]. The local magnitude (ML) was also converted to moment magnitude (Mw) based on the relationship established by Oncescu et al. [8] for crustal events. References: [1] National Institute for Earth Physics (NIEP Romania). (1994). Romanian Seismic Network [Data set]. International Federation of Digital Seismograph Networks. https://doi.org/10.7914/SN/RO [2] AdriaArray Project. https://orfeus.readthedocs.io/en/latest/adria_array_seismicnetworks.html [3] Cristian Neagoe (2022). AdriaArray Temporary Network: Bulgaria, Moldova, Poland, Romania, Ukraine [Data set]. International Federation of Digital Seismograph Networks. https://doi.org/10.7914/b1sc-0n71 [4] S.R. Bratt, W. Nagy (1991). The LOCSAT Program, Science Applications International Corporation (SAIC), San Diego. [5] BRTT - https://brtt.com/ [6] Kennett, B. L. N., & Engdahl, E. R. (1991). Traveltimes for global earthquake location and phase identification. Geophysical Journal International, 105(2), 429-465. https://doi.org/10.1111/j.1365-246X.1991.tb06724.x [7] Ionescu, C., Popa, M., Neagoe, C., & Ghica, D. V. (2020). Seismic Monitoring and Data Processing at the National Institute for Earth Physics–Romania. Summary of the Bulletin of the International Seismological Centre, 55(I), 30-42. https://doi.org/10.31905/33JMP4MA [8] Oncescu M.C., Marza V.I., Rizescu M., Popa M. (1999). The Romanian earthquake catalogue between 984-1997, F.Wenzel et al. (eds.), Vrancea Earthquakes: Tectonics, Hazard and Risk Mitigation, 43-47, Kluwer Academic Publishers.