SEISMIC ACTIVITY AND FOCAL MECHANISMS ANALYSIS FOR DIFFERENT SEISMIC ZONES OF ROMANIA (2010-2014)

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-33-9 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 3, 947-956 pp

ABSTRACT
The systematic studies of the focal mechanism solutions furnish fundamental data about some of the main factors that control the seismic phenomenon, e.g. stress field peculiarities and the types of faulting, the geometry of the faults and provide critical information for global, regional and local tectonic studies, as well as for many types of seismological investigations.
In the last few years were recorded some significant earthquakes in Vrancea subcrustal domain and in other seismic regions at crustal depths. The National Seismic Network was continuously updated in the last years and now the recordings of these events contributes to a complete data base and very important to seismology and seismic hazard assessment studies. The substantial increase of the seismic 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 paper 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.
We have determined fault plane solutions and analyzed the seismic activity recorded 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.
Keywords: focal mechanism, seismicity of Romania