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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 10:12 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Seismotectonics of Vrancea (Romania) zone: the case of crustal seismicity in the foredeep area
Authors:
A.Tugui, M. Craiu, M. Rogozea, M. Popa, M. Radulian
Affiliation:
INCDFP
E-mail
gcraiu@infp.ro, atugui@infp.ro
Keywords:
sequences of Ramnicu Sarat zone
Abstract:
Vrancea seismic zone is located in Romania at the South-Eastern Carpathians Arc bend, where three major tectonic units are in contact: East European Plate, Intra-Alpine Plate and Moesian Plate. The seismicity of the Vrancea zone consists of both crustal and intermediate-depth earthquakes. The crustal events are moderate (Mw ≤5.5) and generally occur in clusters in space (in Ramnicu Sarat and Vrancioaia areas) and in time (main shocks accompanied by aftershocks and sometimes by foreshocks or swarms).
Typically, for the studied region are the sequences of Ramnicu Sarat zone. The main purpose of this presentation is to analyze the characteristics of these events and to interpret them in correlation with the Vrancea seismotectonics. To this aim, we consider the last sequences generated in the Ramnicu Sarat zone. The most recent sequence of 29 November-03 December, 2007 consists of 37 events with local magnitude between 1.8 and 3.9. The hypocenters follow a direction parallel to the Carpathian bend, in agreement with the predominant NE-SW alignment observed in this region. The fault plane solution reflects the transition character of the stress field as revealed by previous studies.
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