EGU21-15666
https://doi.org/10.5194/egusphere-egu21-15666
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Crustal Structure across Central Scandinavian Peninsula along Silver Road refraction profile

Metin Kahraman1,2, Hans Thybo3,4,5, Irina Artemieva6,7,8, Alexey Shulgin9, Alireza Malehmir10, and Rolf Mjelde11
Metin Kahraman et al.
  • 1Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey (metinkahraman@itu.edu.tr)
  • 2Boğaziçi Üniversity Kandilli Observatory and Earthquake Research Institute, Geophysics, İstanbul, Turkey (metin.kahraman@boun.edu.tr)
  • 3Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey (thybo@itu.edu.tr)
  • 4Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway (thybo@geo.uio.no)
  • 5China University of Geosciences, School of Earth Sciences, Wuhan, China (h.thybo@gmail.com)
  • 6GEOMAR Helmholtz Center for Ocean Research, Section of Marine Geodynamics, Kiel, Germany (iartemieva@geomar.de)
  • 7Stanford University, Department of Geophysics, CA 94305, USA (irinageo@stanford.edu)
  • 8China University of Geosciences, School of Earth Sciences, Wuhan, China (iartemieva@gmail.com)
  • 9Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway (alexey.shulgin@geo.uio.no)
  • 10Uppsala University, Uppsala, Sweden (Alireza.Malehmir@geo.uu.se)
  • 11Department of Earth Science, University of Bergen, Bergen, Norway (Rolf.Mjelde@geo.uib.no)

The Baltic Shield is located in the northern part of Europe, which formed by amalgamation of a series of terranes and microcontinents during the Archean to the Paleoproterozoic, followed by significant modification in Neoproterozoic to Paleozoic time. The Baltic Shield includes an up-to 2500 m high mountain range, the Scandes , along the western North Atlantic coast, despite being a stable craton located far from any active plate boundary.

We study a crustal scale seismic profile experiment in northern Scandinavia between 63oN and 71oN. Our Silverroad seismic profile extends perpendicular to the coastline around Lofoten and extends ~300km in a northwest direction across the shelf into the Atlantic Ocean and ~300km in a southeastern direction across the Baltic Shield. The seismic data were acquired with 5 explosive sources and 270 receivers onshore; 16 ocean bottom seismometers and air gun shooting from the vessel Hakon Mosby were used to collect both offshore and onshore.

We present the results from raytracing modelling of the seismic velocity structure along the profile. The outputs of this experiment will help to solve high onshore topography and anomalous and heterogeneous bathymetry of the continental lithosphere around the North Atlantic Ocean. The results show crustal thinning from the shield onto the continental shelf and further into the oceanic part. Of particular interest is the velocity below the high topography of the Scandes, which will be discussed in relation to isostatic equilibrium along the profile.

How to cite: Kahraman, M., Thybo, H., Artemieva, I., Shulgin, A., Malehmir, A., and Mjelde, R.: Crustal Structure across Central Scandinavian Peninsula along Silver Road refraction profile, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15666, https://doi.org/10.5194/egusphere-egu21-15666, 2021.

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