The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography

Authors

  • V. Gobarenko S.I. Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • T. Yegorova S.I. Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • R. Stephenson

DOI:

https://doi.org/10.24028/gzh.0203-3100.v36i2.2014.116115

Keywords:

Black Sea, the Kerch Peninsula, seismological inversion, petrological composition of the crust

Abstract

Local seismic tomographic study has been conducted according to the data of 200 weak earthquakes occurred in 1975-2010 and registered by seven seismic stations in the area of the Kerch peninsula and adjacent northern part of the Black Sea. Application of Backus-Gilbert method for the three-dimensional case allowed to study the velocity structure by P- and S-waves at the depths of 15-40 km and to calculate the ratio VP/VS. Two high velocity blocks have been revealed in the middle and lower crust of the region. The first one includes the P-velocity anomaly of the Kerch peninsula in the area of the western part of the Indol-Kuban trough. The other one is characterized by the S-velocity anomaly of the Shatsky swell and the Tuapse depression. The third high-velocity domain situated in the Black sea water area to the south from the Kerch peninsula belongs most probably to the uppermost mantle that underlie the thin sub-oceanic crust of the East-Black sea basin. Performed petrologic and geodynamic interpretation of the obtained anomalies makes possible to conclude the presence of active processes of thrusting the sub-oceanic crust of the East-Black sea basin under the continental crust of the Scythian plate and the southern part of the East-European platform. The transition area is controlled by a zone of high seismic activity, where the earthquake foci deepen northward that can be an additional evidence of on going underthrusting processes in the study region.

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Published

2014-04-01

How to Cite

Gobarenko, V., Yegorova, T., & Stephenson, R. (2014). The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography. Geofizicheskiy Zhurnal, 36(2), 18–34. https://doi.org/10.24028/gzh.0203-3100.v36i2.2014.116115

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