Electromagnetic Study of the Trans-European Suture Zone (EMTESZ)
EMTESZ Pomerania is a joint research project of the Free University of
Berlin, the Polish Academy of Sciences and the Russian Academy of
Sciences to study the deep geoelectrical structure of the crust and
upper mantle across the central segment of the Trans-European Suture
Zone (TESZ) in Pomerania/Poland with geoelectromagnetic methods. The
TESZ constitutes one of the most prominent tectonic boundaries in
Europe and separates the Precambrian East European Platform and Baltic
Shield from the Paleozoic mountain belts of central and western Europe.
It has been extensively studied by a variety of seismological methods,
but little is known about the electrical structure of the subsurface.
We therefore plan an experiment consisting of two profiles crossing the
suture zone, densely occupied by an array of broadband magnetotelluric
sites, and extending from the Baltic Sea in Poland to the Variscan
Front in eastern Germany. We intend to evaluate the full
magnetotelluric/magnetovariational data set by employing new modelling
and inversion algorithms in 2-D and 3-D, including anisotropy. The
study aims at providing insights into the layering of Paleozoic
sediments, the geometry of the Polish-North German conductivity
anomaly, with a special emphasis on a distinction of sedimentary
troughs and black shales as causes for anomalous transfer functions,
structures of the crystalline basement, and a possible anisotropy in
the deep crust or upper mantle.
The FU Berlin contribution to this project is funded by the
German Research Foundation (DFG). Further cooperation partners include
Uppsala University, Oulu University and the Czech Academy of Sciences.
First results may be found in:
- Brasse, H., and EMTESZ-Pomerania Team (2006): Probing Electrical
Conductivity of the Trans-European Suture Zone, EOS,
- (2008), Electromagnetic
images of the deep structure of the Trans-European Suture Zone beneath
Polish Pomerania, Geophys. Res. Lett.,
B.D., Brasse, H., Oskooi, B., Ernst, T., Sokolova, E., Varentsov, I.,
EMTESZ Working Group (2010): The conductivity structure across the
Suture Zone from magnetotelluric and magnetovariational data modeling, Phys.
Earth Planet. Inter., doi:10.1016/j.pepi.2010.08.005.
Fig. 1: Overview of study area
Fig. 2: Induction vectors (real part) and
sedimentary thickness (base of Permian, Scheck-Wenderoth and Lamarche