1 GEODETIC CONTRIBUTION TO RECENT GEODYNAMIC INVESTIGATIONS IN ROMANIA Tiberiu Rus, Johan Neuner, Constantin Moldoveanu, Constantin Marcu, Valentin Danciu, Alexandru Ilieş, Paul Dumitru, Alexandru Călin, Doina Vasilca Technical University of Civil Engineering Bucharest, B-dul Lacul Tei 124, sector 2 ABSTRACT Based on the previous geological and geophysical information a special network for geodynamic monitoring of the Romanian territory has been designed and achieved. The network consists of four lines crossing the major lithosphere contacts: the Tornquist-Teisseyre Zone (TTZ) separating the East European Plate from the Intra-Alpine Microplate (IaP), Peceneaga-Camena Fault, as the boundary between EEP and Moesian Microplate (MoP), and the Trans-Getica Fault (TGF) between MoP and IaP. The fourth line is crossing the Vrancea active geodynamic area located in the bending area of East Carpathians. The project INDEGEN (grant CEEX-2 MENER no. 732/2006-2008) started in 2006 with a duration of three years, managed by the Institute of Geodynamics of the Romanian Academy (IG-AR) in co-operation with other scientific organizations: Technical University for Civil Engineering – Faculty of Geodesy, University of Bucharest, Geological Institute of Romania, and National Institute for Earth Physics. The main task of geodetic investigations includes repeated GPS and leveling observations combined with other observation techniques as gravity. The geodetic network was connected with national GPS permanent stations network and CEGRN (Central European Geodynamic Network) by GPS and leveling observation campaigns performed in July 2007 and July 2008. First results were obtained after two geodetic observations campaigns. 1. INTRODUCTION The INDEGEN project research represents an attempt to explain intimate mechanism of the intermediate-depth seismicity within Vrancea zone through the links between the geodynamic activity seismic contribution of the thermo-baric accommodation phenomena (following the penetration of a colder lithosphere into the hotter upper mantle). The idea came from the correlation between the distribution of earthquakes with the depth (with maxima located at 90 km, 130 km and 150 km), and location of the major thermal discontinuity (asthenosphere) of the three lithosphere compartments joining the region (90 km for Intra-Alpine Microplate, 130 km for Moesian Microplate, and 150 km for East European Plate), based on the well known potential for generating seismic energy of temperature-accommodation phenomena (e.g. convective currents, thermal stress, phase transform processes, devolatilization).