TTZ-South seismic experiment

Authors

  • T. Janik Institute of Geophysics, Polish Academy of Sciences, Poland
  • V. Starostenko Subbotin Institute of Geophysics, 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, National Academy of Sciences of Ukraine, Ukraine http://orcid.org/0000-0003-1170-4129
  • D. Wójcik Institute of Geophysics, Polish Academy of Sciences, Poland
  • J. Mechie DeutschesGeoForschungsZentrum-GFZ, Section “Geophysical Deep Sounding”, Germany
  • A. G łuszyński 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, National Academy of Sciences of Ukraine, Ukraine
  • A. Tolkunov State Geophysical Enterprise “Ukrgeofizika”, Ukraine
  • T. Amashukeli Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine http://orcid.org/0000-0002-8932-8656
  • D. Gryn Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine
  • S. Chulkov Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Ukraine

DOI:

https://doi.org/10.24028/gzh.0203-3100.v42i3.2020.204698

Keywords:

WARR studies, seismic modeling, tomography inversion, velocity model

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-Łysogóry 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-Łysogóry 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

2020-06-10

How to Cite

Janik, T., Starostenko, V., Aleksandrowski, P., Yegorova, T., Czuba, W., Środa, P., Murovskaya, A., Zajats, K., Kolomiyets, K., Lysynchuk, D., Wójcik, D., Mechie, J., G łuszyński, A., Omelchenko, V., Legostaeva, O., Tolkunov, A., Amashukeli, T., Gryn, D., & Chulkov, S. (2020). TTZ-South seismic experiment. Geofizicheskiy Zhurnal, 42(3), 3–15. https://doi.org/10.24028/gzh.0203-3100.v42i3.2020.204698

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