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Volume 7, issue 2
Solid Earth, 7, 425–439, 2016
https://doi.org/10.5194/se-7-425-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The Lithosphere-Asthenosphere Boundary (LAB) Dilemma

Solid Earth, 7, 425–439, 2016
https://doi.org/10.5194/se-7-425-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 24 Mar 2016

Research article | 24 Mar 2016

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

Hanna Silvennoinen1, Elena Kozlovskaya2,1, and Eduard Kissling3 Hanna Silvennoinen et al.
  • 1Sodankylä Geophysical Observatory, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
  • 2Oulu Mining School, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
  • 3Institute of Geophysics, ETH Zürich, Sonneggstrasse 5, 8092 Zürich, Switzerland

Abstract. The POLENET/LAPNET (Polar Earth Observing Network) broadband seismic network was deployed in northern Fennoscandia (Finland, Sweden, Norway, and Russia) during the third International Polar Year 2007–2009. The array consisted of roughly 60 seismic stations. In our study, we estimate the 3-D architecture of the upper mantle beneath the northern Fennoscandian Shield using high-resolution teleseismic P wave tomography. The P wave tomography method can complement previous studies in the area by efficiently mapping lateral velocity variations in the mantle. For this purpose 111 clearly recorded teleseismic events were selected and the data from the stations hand-picked and analysed. Our study reveals a highly heterogeneous lithospheric mantle beneath the northern Fennoscandian Shield though without any large high P wave velocity area that may indicate the presence of thick depleted lithospheric “keel”. The most significant feature seen in the velocity model is a large elongated negative velocity anomaly (up to −3.5 %) in depth range 100–150 km in the central part of our study area that can be followed down to a depth of 200 km in some local areas. This low-velocity area separates three high-velocity regions corresponding to the cratonic units forming the area.

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POLENET/LAPNET broadband seismic network was deployed in northern Fennoscandia 2007–2009. In our study we estimate the 3D architecture of the upper mantle beneath the network using high-resolution teleseismic P-wave tomography. Our study reveals a highly heterogeneous lithospheric mantle. The most significant feature seen in the obtained velocity model is a large elongated low-velocity anomaly beneath the crust, separating the three cratonic units that formed the region in the early Proterozoic.
POLENET/LAPNET broadband seismic network was deployed in northern Fennoscandia 2007–2009. In...
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