CRUSTAL SEISMICITY AND ACTIVE FAULT SYSTEMS IN WESTERN PART OF ROMANIA
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, 799-806 pp
The most significant seismicity in Romania is located in a relatively small area - the Vrancea seismogenic zone, where 2-3 intermediate depth strong earthquakes (Mw>7.0) occur in a century. Although the crustal seismicity is dispersed in several zones of country, only in a few areas the observed magnitudes exceeded Mw=6.0. Nevertheless some crustal earthquakes that occurred in the past have resulted in damages and even casualties. These facts imposed the taking into account of crustal seismicity in the seismic hazard mapping.
Crustal seismicity in Romania is distributed within some belts located along of Carpathians and the Pannonian depression having a more significant concentration in the Vrancea crustal area and in the front of Eastern Carpathians bend, in the Fagaras Mountain area, in the Danubian area, Banat, Crisana, Maramures and North Dobrogea regions. A summary on the crustal seismic activity beneath the western part of Romanian is presented pointing out the most significant events known from both historical and instrumental records. The observed crustal seismicity did not exceed Mw= 5.6 excepting the Fagaras area where the strongest events reached up to Mw=6.5. For each crustal seismogenic zone the main fault systems which can account for the local seismicity are presented.
This study presents a correlation of seismicity data with the local tectonics. A special attention is focused on the Translylvanian Basin and on the Pannonian sector where a correlation of seismicity with deep structure is better documented.
Keywords: crustal seismicity in Romania, epi- and hipocenters, faults, crustal blocks, focal mechanism.
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