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1 Acta Geophysica Polonica

1 2001

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Crustal structure of the East European Craton along the POLONAISE'97 P5 profile

Czuba W., Grad M., Luosto U., Motuza G., Nasedkin V.

Acta Geophysica Polonica

2001

Vol. 49, nr 2

145-168

The large scale seismic experiment POLONAISE'97 (POlish Lithospheric Onsets-An International Seismic Experiment) was carried out in May 1997 in Poland, Lithuania and Germany. Its main purpose was to investigate the structure of the crust and the uppermost mantle in the region of the Trans European Suture Zone. This paper covers the interpretation of seismic and gravity data along the NW-SE trending, 180km long profile P5 located on the East European Craton. The recordings were of a high quality with seismic energy clearly visible along the whole profile. We have not found waves refracted below the upper crust in first arrivals. The PmP wave can usually be correlated at distances starting from 80-100 km. The crystalline crust consists of three parts: the upper, middle and lower crust with P-wave velocities of 5.9-6.3, 6.5-6.85 and 7.0-7.2 km/s, respectively. We have delineated a high velocity body with the P-wave velocity in the range of 6-6.75 km/s in the upper crust in the NW part of the profile. The Moho depth is 42 km at the NW end of the profile dipping to the SE to 44 km with an undulating shape. We have found a floating reflector within the lower crust in the NW part of the profile and a reflecting upper mantle boundary in the central part of the profile at a depth of about 54 km. Sufficient S-wave data was available to estimate the Vp/Vs ratio for each layer, being 1.75 in the high velocity body, 1.67 in the upper crust, 1.70 in the middle crust and 1.76 in the lower crust.