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In the years 1999–2001 two regional seismic refraction lines were performed within a close cooperation with German partners from University of Karlsruhe. The western part of the line Vrancea 2001, with 420 km total length, crosses part of the Transylvanian Basin. The structure of the crust along the seismic line revealed a very complicated crustal structure beginning with Eastern Carpathians and continuing in the Transylvanian Basin until Medias. As a result of the development of the National Seismic Network in the last ten years, more than 100 permanent broadband stations are now continuously operating in Romania. Complementary to this national dataset, maintained and developed in the National Institute for Earth Physics, new data emerged from the temporary seismologic networks established during the joint projects with European partners in the last decades. The data gathered so far is valuable both for seismology purposes and crustal structure studies, especially for the western part of the country, where this kind of data were sparse until now. Between 2009 and 2011, a new reference model for the Earth’s crust and mantle of the European Plate was defined through the NERIES project – EPCrust – from existing data and models. Although the present dataset has its origins in several periods over the last 50 years, the results are made homogeneous and they improve and strengthen our image about the depth of the principal boundaries in the crust. In the last chapter two maps regarding these boundaries are constructed, one for mid-crustal boundary and one for Moho. They were build considering all the punctual information available from different sources in active seismic and seismology which are introduced in the general maps from EPCrust project for Romania. The depths maps in the study region are presented with all their regional peculiarities as they appear, projected on the local tectonic structure for the area under examination. The database gathered from different kind of measurements in Transylvanian Basin and Eastern Pannonian Basin were included in EPCrust and an improved and upgraded model of the Earth crust emerged for Romania.

Crustal Models Assessment in Western Part of Romania Employing Active Seismic and Seismologic Methods