DBPapers
DOI: 10.5593/SGEM2015/B13/S5.118

NEW INSIGHTS INTO THE CRUST STRUCTURE OF WESTERN ROMANIA USING DIFFERENT ANALYSIS TECHNIQUE

D. Tataru, B. Grecu, B. Zaharia, E. Oros, A. Bala
Friday 7 August 2015 by Libadmin2015

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, 911-918 pp

ABSTRACT
As a result of the deployment of the permanent Romanian broadband stations in the last 10 years, valuable data for seismicity and crustal structure studies in Romania has become available. Complementary to this dataset, during a joint project between University of Leeds, UK and National Institute for Earth Physics, Romania (South Carpathian Project – SCP), 33 broadband seismic stations autonomously operated in the western part of the country and continuously provided data for two years (2009-2011). This project offered a good opportunity to study the seismicity and structure of western Romania. First, we study the spatial distribution of epicenters and temporal distribution of origin times of the events occurred between July 2009 and June 2011 and we show that many of the seismic events grouped into clusters are of artificial origin. We also investigate the background seismic noise at stations deployed during SCP experiment and notable diurnal and seasonal variations have been observed at most of the stations. Finally, we used the receiver function technique and a joint inversion technique of receiver function and Rayleigh wave dispersion to derive velocity models for each seismic station location. The results show a thin crust for stations located inside the Pannonian basin (28-30 km). The stations within the Southern and Central Carpathian Orogen are characterized by crustal depths of 35 km. For two station located in the Apuseni Mountains the Moho discontinuity is replace by a transition zone extended between 36 to 40 km depth.

Keywords: seismicity, ambient seismic noise, crust structure, receiver function method