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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:22 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Focal mechanism analysis of recent earthquakes in correlation with Romania seismotectonics
Authors:
Andreea Tugui, Mircea Radulian, Mihaela Popa, Bogdan Grecu, Dragos Tataru, Marius Craiu
Affiliation:
National Institute for Earth Physics, 12 Calugareni St., 077125, PO Box MG-2 Magurele, Romania,
Tel.: +4021 493 01 17, Fax: +4021 493 00 53
E-mail
atugui@infp.ro
Keywords:
focal mechanism
Abstract:
The seismic activity of the Romania territory consists on both shallow and intermediate-depth earthquakes. To define the seismotectonic charachteristics of a seismic region, it is essential to know the seismic and tectonic activities.The seismicity of Romania is distributed in several epicentral zones: Vrancea, Fagaras-Campulung, Banat, Crisana, Maramures and Dobrogea. The seismic activity in Romania is mainly distributed at the contact between the principal tectonic units: the East-European Plate, the Moesian Plate and Intra-Alpine Plate. This activity is monitorized by the National Seismic Network operated by NIEP.The main goal of this presentation is to study the focal mechanism of recent earthquakes occurred in Romania and their correlation with the average stress field.To this aim we use a data set recorded during 1 Jan 2005-31 Dec 2005.From this data set we used only earthquakes with magnitude M≥4 (h≥60km), M≥3 (h≤60km) and recorded at minimum ten stations. For analysis we applied the SEISAN 8.1 algorithm (Jens Havskov and Lars Ottemoller, 2005) and for focal mechanism we used polarities of P waves.The results of the localizations obtained with SEISAN have been compared with results routinely made by HYPO PLUS (Oncescu, 1996). 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 intervales.
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