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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 2:06 |
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Conference: Bucharest University Faculty of Physics 2023 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
A comprehensive seismic data catalogue for the Tg. Jiu (Romania) seismic sequence
Authors:
Marius Mihai(1,2), Mircea Radulian(1,2), Craiu Marius(2), Craiu Andreea(2), Marmureanu Alexandru(2)
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Affiliation:
1)University of Bucharest, Faculty of Physics
2)National Institute for Earth Physics, Calugareni 12, Magurele, Ilfov, Romania
E-mail
mnmarius81@yahoo.com
Keywords:
earthquake catalogue, focal mechanism, magnitude, Gorj area
Abstract:
Seismic activity in Romania is complex and encounters a variety of tectonic domains, from crustal-depth earthquakes, to intermediate-depth. The seismicity that extends down to 200 km depth and which is limited in a small subcrustal seismogenic volume beneath the SE bend of the Carpathians arc, whereas crustal depth seismicity is distributed throughout the territory.
The characterization of seismogenic processes and the assessment of seismic hazard are closely related to zonal seismicity. Earthquake catalogues should provide an in-depth understanding of the seismotectonic setting of the areas of interest and are essential to develop a reliable seismic source model.
For this study the data used are ANTELOPE routine locations, for the seismic sequence which started in February 2023, close to Targu Jiu city, in the Oltenia region, extracted from the INCDFP catalogue. The strongest events, characterized as doublet earthquakes, occurred on 13th and 14th February, the first shock with ML=5.2, and respectively the second shock with ML=5.7. These main shocks were followed by specific seismicity bursts, at focal depths from 1 to 20 km, most of them being situated in the 10-20 km depth interval.
The aim of this work is to show that by using the JHD technique we are able to better delimit specific clusters in comparison with routine catalog locations. It is also important that a catalogue of earthquakes be as comprehensive as possible and provide a complex variety of seismic data. Therefore, in order to provide a more complex characterization for the Tg. Jiu seismic sequence, we also determined the source parameters (MW, M0, f0), along with the focal mechanisms for events with ML≥ 3. The results of this study are useful for assessing past and current tectonic activities and future research of the epicentral area.
Acknowledgement:
This study was carried out within the National Research Program (project MULTIRISC no PN19080102).
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