PASSCAL Experiments in Central Europe Target Lithospheric Structure - Fig. 1

PASSCAL Experiments in Central Europe Target Lithospheric Structure - Fig. 1 Figure 1. Tectonic map of Central Europe. USB – Upper Silesian block; HCM – Holy Cross Mountains; TESZ – Trans-European Suture Zone.

Central Europe has experienced a complex tectonic history that dominated by the accretion of terranes to the rifted margin of Baltica that extends through central Poland (TESZ – Trans European Suture Zone) and formation of the Alps, Carpathians, and Pannonian basin (Figure 1). Beginning in 1997, Central Europe has been covered by an unprecedented network of seismic refraction experiments (Figure 2). These experiments (POLONAISE’97, CELEBRATION 2002, ALP2002, and SUDETES 2003) have only been possible due a massive international cooperative effort. They along with the BOHEMA and ALPASS teleseismic experiments are providing exciting new insights into the structure and evolution of the lithosphere in this complex region.
The CELEBRATION 2000 experiment was the most ambitious of these projects and included 147 shots recorded by 1230 seismic stations forming, during three deployments that resulted in an array of profiles whose total length is about 5400 km. The velocity model derived for the longest profile CEL05 (1420 km; Figure 1) is shown in Figure 3 and displays large variations in structure. In the Pannonian part of the profile, crustal structure is relatively simple. The Moho lies at a depth of only 24-25 km. The most complicated structure is observed in the transition from the Pannonian basin, through the Carpathians, and across the TESZ and margin of the EEC (East European Carton or Baltica). In this area, the sedimentary cover with low velocities (Vp < 5.5 km/s) reaches a depth of about 20 km, and the Moho deepens to about 50 km.

Guterch, A., M. Grad, H. Thybo and G. R. Keller, POLONAISE ’97 – an international seismic experiment between Precambrian and Variscan Europe in Poland: Tectonophysics, 314, p. 101-121, 1999.

Keller, G. R., and R. D. Hatcher, Jr., Some comparisons of the structure and evolution of the southern Appalachian-Ouachita orogen and portions of the Trans-European suture zone region: Tectonophysics, 314, p. 43-68, 1999.

Grad, M., S. L. Jensen, G. R. Keller, A. Guterch, H. Thybo, T. Janik, T. Tiira, J. Yliniemi, U. Luosto, G. Motuza, V. Nasedkin, W. Czuba, E. Gaczynski, P. Sroda, K. C. Miller, M. Wilde-Piorko, K. Komminaho, J. Jacyna, and L. Korabliova, Crustal structure of the Trans-European suture zone region along POLONAISE’97 seismic profile P4: Journal of Geophysical Research, 108, doi:10.1029/2003JB002426, 2003.


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