The PASSEQ (PASive Seismic Experiment in the Trans-European Suture Zone)project investigates the structure of the Earth's crust and upper mantleacross the suture zone between the Phanerozoic Central-European platform and the Precambrian Eastern European Craton. This suture zone (Thesseyre-Tornquist-Zone) is the largest tectonic boundary in Europe and marks an important step in the development of the European continent. A number of geophysical methods have imaged the TESZ as a pronounced boundary, for example magnetic, gravity, electrical and thermal conductivity as well as seismic surveys. These measurements point to a strong contrast in lithospheric structure on both sites of the TESZ. Specifically, the existence of an asthenosphere beneath the Eastern European Craton is debated, whereas the lithosphere-asthenosphere boundary is clearly imaged in approximately 100 km depth beneath Central Europe. The exact structure of the transition between these two regimes will be investigated in high resolution within this project, using passive seismic data. The data were collected from 2006 to 2008 by a temporary network of nearly 200 short-period and broad-band stations, which were operated together with international partners. Data analysis will likewise be performed together with international collaborators. The task of University Potsdam is the calculation of P- and S-receiver functions to map discontinuities. Other project partners will work on surface waves, shear wave splitting or P-wave tomography. Information on crustal velocities, which was collected recently along a number of active seismic profiles in the study region, will also play an integral role. At the end of the project, all of these data sets will be combined into a consistent model of the crust and upper mantle across the TESZ.

Funding agency
DFG - Deutsche Forschungsgemeinschaft
Duration 01.08.2010 - 31.07.2013
Involved personal Brigitte Knapmeyer-Endrun, Frank Krüger

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