A compilation of the available seismic refraction and wide-angle reflection
data from the Barents Sea and the Baltic Shield and a comparison
of the crustal structures of both areas are presented. Seismic cross-sections
and velocity-depth models of the crust have been analyzed. Six areas
differing in crustal structure are revealed and outlined in the Barents
Sea region as a result of the velocity-depth models analysis. Three
main layers are distinguished in the central area: the upper layer
with an average velocity of 3.5 km/s overlies two layers with velocities
of 5.5 and 6.8 km/s. The average thickness of the crust is 33 km.
The crustal structure in the area is anomalous, as compared to the
marginal areas of the sea, and is distinguished by the absence of
the 6.2 km/s velocity layer. Combined seismic cross-sections for
the coastal and marine seismic profiles show that the main seismic
boundaries with velocities of 6.2-6.5, 6.8-7.2 and 8.0-8.2 km/s can
be confidently interpolated from the northern part of the Baltic
Shield to the southern part of the Barents Sea. The junction of their
crusts is marked by a deepening of the crystalline basement with
a seismic velocity of 6.2 km/s. The sedimentary cover thickness increases
to 15-20 km, and the total thickness of the crust is reduced northward
from 40-60 to 28-30 km. A comparison of the models shows that the
Barents Sea Basin and the Baltic Shield appreciably differ in the
total thickness of the earth's crust: under the basin, it is just
about 10 km less than on the shield. Both regions have an important
similarity: seismic velocities in the lower crystalline crust (7.0
km/s) are similar. Their fundamental difference is that the upper
part of the crystalline crust with a seismic velocity of 6.0-6.5
km/s, characteristic of the Baltic Shield, is absent in the central
Barents Sea Basin, and a thick sedimentary layer with velocities
to 5.8 km/s exists instead of it. The anomalous crustal structure
in the central part of the Barents Sea is assumed to be of a riftogenic
nature.
%0 Journal Article
%1 neprochnov_etal:2000
%A Neprochnov, Y. P.
%A Semenov, G. A.
%A Sharov, N. V.
%A Yliniemi, J.
%A Komminaho, K.
%A Luosto, U.
%A Heikkinen, P.
%D 2000
%J Tectonophysics
%K geophysics seismics
%N 4
%P 429--447
%R 10.1016/S0040-1951(00)00079-2
%T Comparison of the crustal structures of the Barents Sea and the Baltic
Shield from seismic data
%U http://dx.doi.org/10.1016/S0040-1951(00)00079-2
%V 321
%X A compilation of the available seismic refraction and wide-angle reflection
data from the Barents Sea and the Baltic Shield and a comparison
of the crustal structures of both areas are presented. Seismic cross-sections
and velocity-depth models of the crust have been analyzed. Six areas
differing in crustal structure are revealed and outlined in the Barents
Sea region as a result of the velocity-depth models analysis. Three
main layers are distinguished in the central area: the upper layer
with an average velocity of 3.5 km/s overlies two layers with velocities
of 5.5 and 6.8 km/s. The average thickness of the crust is 33 km.
The crustal structure in the area is anomalous, as compared to the
marginal areas of the sea, and is distinguished by the absence of
the 6.2 km/s velocity layer. Combined seismic cross-sections for
the coastal and marine seismic profiles show that the main seismic
boundaries with velocities of 6.2-6.5, 6.8-7.2 and 8.0-8.2 km/s can
be confidently interpolated from the northern part of the Baltic
Shield to the southern part of the Barents Sea. The junction of their
crusts is marked by a deepening of the crystalline basement with
a seismic velocity of 6.2 km/s. The sedimentary cover thickness increases
to 15-20 km, and the total thickness of the crust is reduced northward
from 40-60 to 28-30 km. A comparison of the models shows that the
Barents Sea Basin and the Baltic Shield appreciably differ in the
total thickness of the earth's crust: under the basin, it is just
about 10 km less than on the shield. Both regions have an important
similarity: seismic velocities in the lower crystalline crust (7.0
km/s) are similar. Their fundamental difference is that the upper
part of the crystalline crust with a seismic velocity of 6.0-6.5
km/s, characteristic of the Baltic Shield, is absent in the central
Barents Sea Basin, and a thick sedimentary layer with velocities
to 5.8 km/s exists instead of it. The anomalous crustal structure
in the central part of the Barents Sea is assumed to be of a riftogenic
nature.
@article{neprochnov_etal:2000,
abstract = {A compilation of the available seismic refraction and wide-angle reflection
data from the Barents Sea and the Baltic Shield and a comparison
of the crustal structures of both areas are presented. Seismic cross-sections
and velocity-depth models of the crust have been analyzed. Six areas
differing in crustal structure are revealed and outlined in the Barents
Sea region as a result of the velocity-depth models analysis. Three
main layers are distinguished in the central area: the upper layer
with an average velocity of 3.5 km/s overlies two layers with velocities
of 5.5 and 6.8 km/s. The average thickness of the crust is 33 km.
The crustal structure in the area is anomalous, as compared to the
marginal areas of the sea, and is distinguished by the absence of
the 6.2 km/s velocity layer. Combined seismic cross-sections for
the coastal and marine seismic profiles show that the main seismic
boundaries with velocities of 6.2-6.5, 6.8-7.2 and 8.0-8.2 km/s can
be confidently interpolated from the northern part of the Baltic
Shield to the southern part of the Barents Sea. The junction of their
crusts is marked by a deepening of the crystalline basement with
a seismic velocity of 6.2 km/s. The sedimentary cover thickness increases
to 15-20 km, and the total thickness of the crust is reduced northward
from 40-60 to 28-30 km. A comparison of the models shows that the
Barents Sea Basin and the Baltic Shield appreciably differ in the
total thickness of the earth's crust: under the basin, it is just
about 10 km less than on the shield. Both regions have an important
similarity: seismic velocities in the lower crystalline crust (7.0
km/s) are similar. Their fundamental difference is that the upper
part of the crystalline crust with a seismic velocity of 6.0-6.5
km/s, characteristic of the Baltic Shield, is absent in the central
Barents Sea Basin, and a thick sedimentary layer with velocities
to 5.8 km/s exists instead of it. The anomalous crustal structure
in the central part of the Barents Sea is assumed to be of a riftogenic
nature.},
added-at = {2012-09-01T13:08:21.000+0200},
author = {Neprochnov, Y. P. and Semenov, G. A. and Sharov, N. V. and Yliniemi, J. and Komminaho, K. and Luosto, U. and Heikkinen, P.},
biburl = {https://www.bibsonomy.org/bibtex/2b6d14189908b237ab7244895b1281d89/nilsma},
day = 30,
doi = {10.1016/S0040-1951(00)00079-2},
interhash = {f95db9eda406b9aa6e2caf8397763866},
intrahash = {b6d14189908b237ab7244895b1281d89},
issn = {00401951},
journal = {Tectonophysics},
keywords = {geophysics seismics},
month = jun,
number = 4,
pages = {429--447},
timestamp = {2021-02-09T13:27:42.000+0100},
title = {Comparison of the crustal structures of the Barents Sea and the Baltic
Shield from seismic data},
url = {http://dx.doi.org/10.1016/S0040-1951(00)00079-2},
volume = 321,
year = 2000
}