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

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

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-dimension...

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Main Authors: Gobarenko, V., Yegorova, T., Stephenson, R.
Format: Article
Language:rus
Published: Subbotin Institute of Geophysics of the NAS of Ukraine 2014
Subjects:
Black Sea
the Kerch Peninsula
seismological inversion
petrological composition of the crust
Online Access:https://journals.uran.ua/geofizicheskiy/article/view/116115
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spelling journalsuranua-geofizicheskiy-article-1161152020-10-07T11:58:11Z The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography Gobarenko, V. Yegorova, T. Stephenson, R. Black Sea the Kerch Peninsula seismological inversion petrological composition of the crust 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. Subbotin Institute of Geophysics of the NAS of Ukraine 2014-04-01 Article Article application/pdf https://journals.uran.ua/geofizicheskiy/article/view/116115 10.24028/gzh.0203-3100.v36i2.2014.116115 Geofizicheskiy Zhurnal; Vol. 36 No. 2 (2014); 18-34 Геофизический журнал; Том 36 № 2 (2014); 18-34 Геофізичний журнал; Том 36 № 2 (2014); 18-34 2524-1052 0203-3100 rus https://journals.uran.ua/geofizicheskiy/article/view/116115/110199 Copyright (c) 2020 Geofizicheskiy Zhurnal https://creativecommons.org/licenses/by/4.0
institution Geofizicheskiy Zhurnal
collection OJS
language rus
topic Black Sea
the Kerch Peninsula
seismological inversion
petrological composition of the crust
spellingShingle Black Sea
the Kerch Peninsula
seismological inversion
petrological composition of the crust
Gobarenko, V.
Yegorova, T.
Stephenson, R.
The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography
topic_facet Black Sea
the Kerch Peninsula
seismological inversion
petrological composition of the crust
format Article
author Gobarenko, V.
Yegorova, T.
Stephenson, R.
author_facet Gobarenko, V.
Yegorova, T.
Stephenson, R.
author_sort Gobarenko, V.
title The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography
title_short The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography
title_full The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography
title_fullStr The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography
title_full_unstemmed The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography
title_sort structure of the kerch peninsula and north-eastern part of the black sea crust according to the results of local seismic tomography
description 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.
publisher Subbotin Institute of Geophysics of the NAS of Ukraine
publishDate 2014
url https://journals.uran.ua/geofizicheskiy/article/view/116115
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first_indexed 2024-04-21T19:40:33Z
last_indexed 2024-04-21T19:40:33Z
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