Applied and Environmental Geophysics 537 Fig. 1 Marine area investigated off the Romanian and Bulgarian coast (dashed polygon). The main geotectonic units are depicted. STF – Sulina Tarkhankut Fault, PCF – Peceneaga-Camena Fault, COF – Capidava- Ovidiu Fault, IMF – Intra Moesian Fault. Compiled from [1], [2], [3]. MAPS OF THE GRAVITY AND MAGNETIC ANOMALIES FOR THE WESTERN BLACK SEA CONTINENTAL MARGIN (ROMANIAN-BULGARIAN SECTOR) Dr. Radu G. Dimitriu 1 Dr. Gheorghe Oaie 1 Prof. Dr. Boyko Ranguelov 2 Prof. Dr. Radi Radichev 2 1 National Institute of Marine Geology and Geoecology, Romania 2 University of Mining and Geology, Bulgaria ABSTRACT Unified maps reflecting the regional morphology of gravity and geomagnetic fields across a wide sector of the western Black Sea continental margin, summing over 65,000 sq.km of which about 47,000 sq.km are offshore, were obtained by integrating gravity and magnetic data recently measured off the Romanian and Bulgarian coast with similar historic data, independently measured onshore during the previous decades. Thus, the resulted composite map of gravity anomaly compiles the Bouguer and Free Air gravity anomalies obtained from measurements carried on onshore and respectively offshore. Unlike this, the composite map of magnetic anomaly integrates magnetic total field data acquired recently offshore and by airborne measurements over Romanian onshore several decades ago, with magnetic vertical component data measured on Bulgarian dryland. The geophysical composite maps resulted are advanced tools for the future researches and modellings aiming to decipher the deep geological structure of the western Black Sea continental margin, of the processes that govern its past and actual geodynamics. Keywords: Black Sea, gravity, magnetics, maps. INTRODUCTION During December 2010 and May 2013 four research institutes from Romania and Bulgaria ran an EU funded, cross-border cooperation project aiming the set up and implementation along the coast and the adjacent offshore of the first early-warning system for geohazards of marine origin in the Black Sea basin. Beside the efforts namely dedicated to the implementation of the system’s core components, a special attention was focused on gathering, data- basing all existing geo-information relative to the Romanian and Bulgarian coast zone and offshore and also to covering the entire