Comparison of crustal structure along DSS profiles in SE Fennoscandia
The main features of the crustal structure of the Karelian and Svecofennian provinces are discussed on the basis of data obtained from deep seismic sounding (DSS) profiles across the SE Fennoscandian Shield. The data show that in the ancient Karelian province the crust is thinner (about 40 km), the...
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1990
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fthighwire:oai:open-archive.highwire.org:gji:103/1/157 2023-05-15T16:11:53+02:00 Comparison of crustal structure along DSS profiles in SE Fennoscandia Korhonen, H. Kosminskaya, I. P. Azbel, I. Sharov, N. Zagorodny, V. Luosto, U. 1990-10-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/103/1/157 https://doi.org/10.1111/j.1365-246X.1990.tb01760.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/103/1/157 http://dx.doi.org/10.1111/j.1365-246X.1990.tb01760.x Copyright (C) 1990, Oxford University Press Articles TEXT 1990 fthighwire https://doi.org/10.1111/j.1365-246X.1990.tb01760.x 2015-02-28T17:53:39Z The main features of the crustal structure of the Karelian and Svecofennian provinces are discussed on the basis of data obtained from deep seismic sounding (DSS) profiles across the SE Fennoscandian Shield. The data show that in the ancient Karelian province the crust is thinner (about 40 km), the average velocity is lower (about 6.4 km s-1) and the Moho boundary is a sharp discontinuity which produces strong reflections. The high-velocity layer in the lower crust, if it exists at all, is thin. In the younger Svecofennian province, crustal thickness averages about 45 km with a velocity of 6.6–6.8 km s-1. The reflectivity of the Moho is usually weak and a high-velocity layer with velocities greater than 7 km s-1 is ubiquitous in the lower crust. High velocities in the lower crust and upper mantle are found in deep Moho areas. Beneath the younger granitic intrusions, Gothian complex and Vyborg Rapakivi granites, the crust is thinner than on average. Text Fennoscandia Fennoscandian karelian HighWire Press (Stanford University) Geophysical Journal International 103 1 157 162 |
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English |
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Articles Korhonen, H. Kosminskaya, I. P. Azbel, I. Sharov, N. Zagorodny, V. Luosto, U. Comparison of crustal structure along DSS profiles in SE Fennoscandia |
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Articles |
description |
The main features of the crustal structure of the Karelian and Svecofennian provinces are discussed on the basis of data obtained from deep seismic sounding (DSS) profiles across the SE Fennoscandian Shield. The data show that in the ancient Karelian province the crust is thinner (about 40 km), the average velocity is lower (about 6.4 km s-1) and the Moho boundary is a sharp discontinuity which produces strong reflections. The high-velocity layer in the lower crust, if it exists at all, is thin. In the younger Svecofennian province, crustal thickness averages about 45 km with a velocity of 6.6–6.8 km s-1. The reflectivity of the Moho is usually weak and a high-velocity layer with velocities greater than 7 km s-1 is ubiquitous in the lower crust. High velocities in the lower crust and upper mantle are found in deep Moho areas. Beneath the younger granitic intrusions, Gothian complex and Vyborg Rapakivi granites, the crust is thinner than on average. |
format |
Text |
author |
Korhonen, H. Kosminskaya, I. P. Azbel, I. Sharov, N. Zagorodny, V. Luosto, U. |
author_facet |
Korhonen, H. Kosminskaya, I. P. Azbel, I. Sharov, N. Zagorodny, V. Luosto, U. |
author_sort |
Korhonen, H. |
title |
Comparison of crustal structure along DSS profiles in SE Fennoscandia |
title_short |
Comparison of crustal structure along DSS profiles in SE Fennoscandia |
title_full |
Comparison of crustal structure along DSS profiles in SE Fennoscandia |
title_fullStr |
Comparison of crustal structure along DSS profiles in SE Fennoscandia |
title_full_unstemmed |
Comparison of crustal structure along DSS profiles in SE Fennoscandia |
title_sort |
comparison of crustal structure along dss profiles in se fennoscandia |
publisher |
Oxford University Press |
publishDate |
1990 |
url |
http://gji.oxfordjournals.org/cgi/content/short/103/1/157 https://doi.org/10.1111/j.1365-246X.1990.tb01760.x |
genre |
Fennoscandia Fennoscandian karelian |
genre_facet |
Fennoscandia Fennoscandian karelian |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/103/1/157 http://dx.doi.org/10.1111/j.1365-246X.1990.tb01760.x |
op_rights |
Copyright (C) 1990, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1990.tb01760.x |
container_title |
Geophysical Journal International |
container_volume |
103 |
container_issue |
1 |
container_start_page |
157 |
op_container_end_page |
162 |
_version_ |
1765997087266177024 |