The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography

The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography

3D gravity analysis and local seismic tomography have been performed to study the lithosphere structure of the Black Sea. Due to gravity analysis gravity effects of different layers and levels of the model (sea water, four layers in sediments, consolidated crust) have been distinguished and residual...

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Дата:2012
Автори: Egorova, T. P., Gobarenko, B. S., Yanovskaya, T. B., Baranova, K. P.
Формат: Стаття
Мова:rus
Опубліковано: Subbotin Institute of Geophysics of the NAS of Ukraine 2012
Онлайн доступ:https://journals.uran.ua/geofizicheskiy/article/view/116662
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Назва журналу:Geofizicheskiy Zhurnal

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Geofizicheskiy Zhurnal
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spelling journalsuranua-geofizicheskiy-article-1166622020-10-07T12:21:20Z The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography Egorova, T. P. Gobarenko, B. S. Yanovskaya, T. B. Baranova, K. P. 3D gravity analysis and local seismic tomography have been performed to study the lithosphere structure of the Black Sea. Due to gravity analysis gravity effects of different layers and levels of the model (sea water, four layers in sediments, consolidated crust) have been distinguished and residual gravity anomalies of mantle origin have been obtained. Long-wave component of these anomalies forms the vast area of positive values with small amplitude that indicates good isostatic balance of deep structures of the Black Sea. Velocity structure of lithospheric mantle of the Black Sea (down to the depth of 85 km) was studied by local seismic tomography which used travel times of P-waves from the earthquakes occurred inside the region and recorded by a net of seismic stations around the Black Sea. Results of seismic tomography study indicate heterogeneous structure of the upper mantle of the Black Sea with dominant areas of increased velocities in the western and eastern parts of the sea. Joining of two methods - gravity analysis and seismic tomography has been carried out by calculation of gravity effect of the upper mantle heterogeneities obtained by seismic tomography. Correspondence of the sign and order of magnitude of anomalous mantle gravity field obtained by two mentioned independent methods gives us an opportunity to conclude on the presence of sufficiently rigid continental lithosphere under the Black Sea. Subbotin Institute of Geophysics of the NAS of Ukraine 2012-10-01 Article Article application/pdf https://journals.uran.ua/geofizicheskiy/article/view/116662 10.24028/gzh.0203-3100.v34i5.2012.116662 Geofizicheskiy Zhurnal; Vol. 34 No. 5 (2012); 38-59 Геофизический журнал; Том 34 № 5 (2012); 38-59 Геофізичний журнал; Том 34 № 5 (2012); 38-59 2524-1052 0203-3100 rus https://journals.uran.ua/geofizicheskiy/article/view/116662/110736 Copyright (c) 2020 Geofizicheskiy Zhurnal https://creativecommons.org/licenses/by/4.0
institution Geofizicheskiy Zhurnal
collection OJS
language rus
format Article
author Egorova, T. P.
Gobarenko, B. S.
Yanovskaya, T. B.
Baranova, K. P.
spellingShingle Egorova, T. P.
Gobarenko, B. S.
Yanovskaya, T. B.
Baranova, K. P.
The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography
author_facet Egorova, T. P.
Gobarenko, B. S.
Yanovskaya, T. B.
Baranova, K. P.
author_sort Egorova, T. P.
title The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography
title_short The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography
title_full The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography
title_fullStr The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography
title_full_unstemmed The structure of the lithosphere of the Black Sea by the results of 3D gravity analysis and seismic tomography
title_sort structure of the lithosphere of the black sea by the results of 3d gravity analysis and seismic tomography
description 3D gravity analysis and local seismic tomography have been performed to study the lithosphere structure of the Black Sea. Due to gravity analysis gravity effects of different layers and levels of the model (sea water, four layers in sediments, consolidated crust) have been distinguished and residual gravity anomalies of mantle origin have been obtained. Long-wave component of these anomalies forms the vast area of positive values with small amplitude that indicates good isostatic balance of deep structures of the Black Sea. Velocity structure of lithospheric mantle of the Black Sea (down to the depth of 85 km) was studied by local seismic tomography which used travel times of P-waves from the earthquakes occurred inside the region and recorded by a net of seismic stations around the Black Sea. Results of seismic tomography study indicate heterogeneous structure of the upper mantle of the Black Sea with dominant areas of increased velocities in the western and eastern parts of the sea. Joining of two methods - gravity analysis and seismic tomography has been carried out by calculation of gravity effect of the upper mantle heterogeneities obtained by seismic tomography. Correspondence of the sign and order of magnitude of anomalous mantle gravity field obtained by two mentioned independent methods gives us an opportunity to conclude on the presence of sufficiently rigid continental lithosphere under the Black Sea.
publisher Subbotin Institute of Geophysics of the NAS of Ukraine
publishDate 2012
url https://journals.uran.ua/geofizicheskiy/article/view/116662
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first_indexed 2024-04-21T19:41:09Z
last_indexed 2024-04-21T19:41:09Z
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