Analysis of Current Movements and Deformations of the Earth’s Crust in Fennoscandia from GNSS Data

—An analysis of the displacement rates of GNSS points indicates that the values of current deformations gradually decrease from the center of Fennoscandia, which is under tensile conditions, to its periphery. At the northeastern margin of the region, the tensile and shear conditions are replaced by...

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Bibliographic Details
Published in:Izvestiya. Physics of the solid earth 2022-08, Vol.58 (4), p.459-468
Main Authors: Steblov, G. M., Agibalov, A. O., Mel’nik, G. E., Perederin, V. P., Perederin, F. V., Sentsov, A. A.
Format: Article
Language:English
Subjects:
Compression
Deformation
Earth and Environmental Science
Earth crust
Earth Sciences
Earthquakes
Geophysics/Geodesy
Lakes
Mid-ocean ridges
Seismic activity
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Summary:—An analysis of the displacement rates of GNSS points indicates that the values of current deformations gradually decrease from the center of Fennoscandia, which is under tensile conditions, to its periphery. At the northeastern margin of the region, the tensile and shear conditions are replaced by a compression strip extending from Lake Ladoga to the Gulf of Kandalaksha. These features of the deformation field are consistent with the solutions for the focal mechanisms of earthquake sources and can be explained by the fact that the study region is developing as a growing elevation, with its center in the northern Gulf of Bothnia, which is under horizontal northwestward compression from the Mid-Atlantic Ridge. It is shown that most of the seismic generation zones we previously determined are located in the areas of increased values of deformations.
ISSN:1069-3513
1555-6506
DOI:10.1134/S1069351322040127