HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATA
A generalization has been obtained based on the data for deep seismic studies on longitudinal DSS profiles (explosion seismology) and seismological evidence found for local and distant earthquakes (earthquake seismology) in the Fennoscandian Shield over the past 40 years. This provided an opportunit...
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2022-03-01
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| Series: | Геодинамика и тектонофизика |
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| Online Access: | https://www.gt-crust.ru/jour/article/view/1421 |
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| author | N. V. Sharov A. A. Lebedev |
| author_facet | N. V. Sharov A. A. Lebedev |
| author_sort | N. V. Sharov |
| collection | DOAJ |
| description | A generalization has been obtained based on the data for deep seismic studies on longitudinal DSS profiles (explosion seismology) and seismological evidence found for local and distant earthquakes (earthquake seismology) in the Fennoscandian Shield over the past 40 years. This provided an opportunity to obtaine quantitative data on the horizontal and vertical heterogeneities of the lithosphere. 3D seismological models were first constructed for the individual parts of the Fennoscandian Shield which show that the crystalline crust structure acquires a block hierarchy pattern, with no persistent seismic boundaries found within the entire shield. The upper crust is characterized by the local occurrence of both waveguides and high-velocity zones correlated with geological bodies. The structural plans of the velocity isolines of various deep sections were found to be inconsistent. It has been proved that major geotectonic provinces have a thick crust and that the Early Proterozoic volcanogenic belts are characterized by elevated velocities and a large crustal thickness. In the upper mantle of the Fennoscandian Shield there were identified the layers with anomalously high velocities. No robust evidence was found for a waveguide, which is sometimes related to the concept of the lithosphere. |
| format | Article |
| id | doaj-art-9d41dc94069b41d78ae79eb1f976d3e5 |
| institution | Kabale University |
| issn | 2078-502X |
| language | English |
| publishDate | 2022-03-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj-art-9d41dc94069b41d78ae79eb1f976d3e52025-08-20T03:59:45ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2022-03-0113110.5800/GT-2022-13-1-0569589HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATAN. V. Sharov0A. A. Lebedev1Institute of Geology of the Karelian Research Center, Russian Academy of SciencesInstitute of Geology of the Karelian Research Center, Russian Academy of SciencesA generalization has been obtained based on the data for deep seismic studies on longitudinal DSS profiles (explosion seismology) and seismological evidence found for local and distant earthquakes (earthquake seismology) in the Fennoscandian Shield over the past 40 years. This provided an opportunity to obtaine quantitative data on the horizontal and vertical heterogeneities of the lithosphere. 3D seismological models were first constructed for the individual parts of the Fennoscandian Shield which show that the crystalline crust structure acquires a block hierarchy pattern, with no persistent seismic boundaries found within the entire shield. The upper crust is characterized by the local occurrence of both waveguides and high-velocity zones correlated with geological bodies. The structural plans of the velocity isolines of various deep sections were found to be inconsistent. It has been proved that major geotectonic provinces have a thick crust and that the Early Proterozoic volcanogenic belts are characterized by elevated velocities and a large crustal thickness. In the upper mantle of the Fennoscandian Shield there were identified the layers with anomalously high velocities. No robust evidence was found for a waveguide, which is sometimes related to the concept of the lithosphere.https://www.gt-crust.ru/jour/article/view/1421fennoscandian shieldearth’s crustupper mantleseismic modelm-discontinuitysuperdeep drillingprecambrian shield |
| spellingShingle | N. V. Sharov A. A. Lebedev HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATA Геодинамика и тектонофизика fennoscandian shield earth’s crust upper mantle seismic model m-discontinuity superdeep drilling precambrian shield |
| title | HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATA |
| title_full | HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATA |
| title_fullStr | HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATA |
| title_full_unstemmed | HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATA |
| title_short | HETEROGENEOUS LITHOSPHERIC STRUCTURE OF THE FENNOSCANDIAN SHIELD: SEISMIC DATA |
| title_sort | heterogeneous lithospheric structure of the fennoscandian shield seismic data |
| topic | fennoscandian shield earth’s crust upper mantle seismic model m-discontinuity superdeep drilling precambrian shield |
| url | https://www.gt-crust.ru/jour/article/view/1421 |
| work_keys_str_mv | AT nvsharov heterogeneouslithosphericstructureofthefennoscandianshieldseismicdata AT aalebedev heterogeneouslithosphericstructureofthefennoscandianshieldseismicdata |