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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:32 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Seismic activity in the last five years and focal mechanisms analysis of the main seismic areas of Romania
Authors:
Andreea CRAIU, M. CRAIU, A. MARMUREANU, M. DIACONESCU
Affiliation:
National Institute for Earth Physics, Bucharest- Magurele, Romania
E-mail
atugui@infp.ro
Keywords:
seismicity, focal mechanism
Abstract:
In the last few years were recorded some significant earthquakes in Vrancea subcrustal domain and also crustal events. The National Seismic Netwok was continuously updated in the last years and now the recordings of these events contributes to a more complete data base and very important to seismology and engineering seismology studies. The substantial increase of number of recordings and the azimuthal gap leads to a more precise knowledge about focal mechanism, the structure and source parameters. The seismicity of Romania is distributed in several epicentral zones: Vrancea, Fagaras-Campulung, Banat, Crisana, Maramures and Dobrogea. The main goal of this presentation is to study seismicity evolution and the focal mechanism analysis of recent earthquakes occurred in Romania (in last five years) and their correlation with the average stress field. To this aim we use a data set recorded during 1 Jan 2010-31 May 2014. Location of seismic events was made with the program developed by Oncescu HYPOPLUS (1996). For focal mechanism analysis we used polarities of P waves and we applied the SEISAN 8.1 algorithm (Jens Havskov and Lars Ottemoller, 2005). For analysis fault plane solutions we used only earthquakes with magnitude M≥4 (h≥60km), M≥3 (h≤60km) and recorded at minimum ten stations. We have determined fault plane solutions and analyzed seismic activity on the Romania territory in connection with seismogenic zones. At the same time, our results are integrated and interpreted in connection with the stress field characteristics, deduced from the available fault plane solutions on different depth intervals.
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