TTZ-SOUTH seismic experiment

Authors

  • T. Janik Institute of Geophysics, Polish Academy of Sciences, Poland
  • V. Starostenko Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • P. Aleksandrowski Institute of Geological Sciences, University of Wroclaw; Polish Geological Institute - National Research Institute, Poland
  • T. Yegorova Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine
  • W. Czuba Institute of Geophysics, Polish Academy of Sciences, Poland
  • P. Środa Institute of Geophysics, Polish Academy of Sciences, Poland
  • A. Murovskaya Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine
  • K. Zajats Zakhidnadra Servis, Ukraine
  • K. Kolomiyets Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine
  • D. Lysynchuk Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • D. Wуjcik Institute of Geophysics, Polish Academy of Sciences, Ukraine
  • J. Mechie Deutsches GeoForschungsZentrum, Germany
  • A. Głuszyński Polish Geological Institute - National Research Institute, Poland
  • V. Omelchenko Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine
  • O. Legostaeva Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • A. Tolkunov State Geophysical Enterprise «Ukrgeofizika», Ukraine
  • T. Amashukeli Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • D. Gryn Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • S. Chulkov Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine

DOI:

https://doi.org/10.24028/gzh.v43i2.230189

Abstract

The wide-angle reflection and refraction (WARR) TTZ-South transect carried out in 2018 crosses the SW region of Ukraine and the SE region of Poland. The TTZ-South profile targeted the structure of the Earth’s crust and upper mantle of the Trans-European Suture Zone, as well as the southwestern segment of the East European Craton (slope of the Ukrainian Shield). The ~550 km long profile (~230 km in Poland and ~320 km in western Ukraine) is an extension of previously realized projects in Poland, TTZ (1993) and CEL03 (2000). The deep seismic sounding study along the TTZ-South profile using TEXAN and DATA-CUBE seismic stations (320 units) made it possible to obtain high-quality seismic records from eleven shot points (six in Ukraine and five in Poland). This paper presents a smooth P wave velocity model based on first-arrival travel-time inversion using the FAST (First Arrival Seismic Tomography) code. The obtained image represents a preliminary velocity model which, according to the P wave velocities, consists of a sedimentary layer and the crystalline crust that could comprise upper, middle and lower crustal layers. The Moho interface, approximated by the 7.5 km/s isoline, is located at 45—47 km depth in the central part of the profile, shallowing to 40 and 37 km depth in the northern (Radom-Łysogуry Unit, Poland) and southern (Volyno-Podolian Monocline, Ukraine) segments of the profile, respectively. A peculiar feature of the velocity cross-section is a number of high-velocity bodies distinguished in the depth range of 10—35 km. Such high-velocity bodies were detected previously in the crust of the Radom-Łysogуry Unit. These bodies, inferred at depths of 10—35 km, could be allochthonous fragments of what was originally a single mafic body or separate mafic bodies intruded into the crust during the break-up of Rodinia in the Neoproterozoic, which was accompanied by considerable rifting. The manifestations of such magmatism are known in the NE part of the Volyno-Podolian Monocline, where the Vendian trap formation occurs at the surface.

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Published

2021-06-03

How to Cite

Janik, T., Starostenko, V. ., Aleksandrowski, P. ., Yegorova, T., Czuba, W., Środa, P., Murovskaya, A., Zajats, K., Kolomiyets, K. ., Lysynchuk, D., Wуjcik D. ., Mechie, J., Głuszyński, A., Omelchenko, V., Legostaeva, O. ., Tolkunov, A., Amashukeli, T., Gryn, D., & Chulkov, S. . (2021). TTZ-SOUTH seismic experiment. Geofizicheskiy Zhurnal, 43(2), 28–44. https://doi.org/10.24028/gzh.v43i2.230189

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