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We present a new 1-D P wave seismic velocity model (called MP1-SUW) of theupper mantle structure beneath the western rim of the East European Craton(EEC) based on the analysis of the earthquakes recorded at the Suwałki(SUW) seismic station located in NE Poland which belongs to the PolishSeismological Network (PLSN). Motivation for this study arises from theobservation of a group of reflected waves after expected P410P atepicentral distances 2300–2800 km from the SUW station. Although theexisting global models represent the first-arrival traveltimes, they do notrepresent the full wavefield with all reflected waves because they do nottake into account the structural features occurring regionally such as300 km discontinuity. We perform P wave traveltime analysis using 1-D and 2-Dforward ray-tracing modelling for the distances of up to 3000 km. Weanalysed249 natural seismic events from four azimuthal spans with epicentres in thewestern Mediterranean Sea region (WMSR), the Greece and Turkey region (GTR),the Caucasus region (CR) and the part of the northern Mid-Atlantic Ridge near theJan Mayen Island (JMR). For all chosen regions, except the JMR group forwhich 2-D modelling was performed, we estimate a 1-D average velocity modelwhich will characterize the main seismic discontinuities. It appears that asingle 1-D model (MP1-SUW model) explains well the observed traveltimes forthe analysed groups of events. Differences resulting from the differentazimuth range of earthquakes are close to the assumed picking uncertainty.The MP1-SUW model documents the bottom of the asthenospheric low-velocity zone(LVZ) at the depth of 220 km, 335 km discontinuity and the zone with thereduction of P wave velocity atop 410 km discontinuity which is depressed to440 km depth. The nature of the regionally occurring 300 km boundary isexplained here by tracing the ancient subduction regime related to theclosure of the Iapetus Ocean, the Rheic Ocean and the Tornquist Sea

A new model of the upper mantle structure beneath the western rim of the East European Craton