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The POLENET/LAPNET (Polar Earth Observing Network) broadband seismic network was deployed in northernFennoscandia (Finland, Sweden, Norway, and Russia) during the thirdInternational Polar Year 2007–2009. The array consisted of roughly 60seismic stations. In our study, we estimate the 3-D architecture of the uppermantle beneath the northern Fennoscandian Shield using high-resolutionteleseismic P wave tomography. The P wave tomography method cancomplement previous studies in the area by efficiently mapping lateralvelocity variations in the mantle. For this purpose 111 clearly recordedteleseismic events were selected and the data from the stations hand-pickedand analysed. Our study reveals a highly heterogeneous lithospheric mantlebeneath the northern Fennoscandian Shield though without any large high Pwave velocity area that may indicate the presence of thick depletedlithospheric “keel”. The most significant feature seen in the velocitymodel is a large elongated negative velocity anomaly (up to −3.5 %) indepth range 100–150 km in the central part of our study area that can befollowed down to a depth of 200 km in some local areas. This low-velocityarea separates three high-velocity regions corresponding to the cratonicunits forming the area

POLENET/LAPNET teleseismic &lt;i&gt;P&lt;/i&gt; wave travel time tomography model of the upper mantle beneath northern Fennoscandia

POLENET/LAPNET teleseismic <i>P</i> wave travel time tomography model of the upper mantle beneath northern Fennoscandia