Features of postglacial activity of the Imandra-Kolvitsky fault (Kola Peninsula) according to geomorphological and geophysical data

The article is devoted to the study of the postglacial tectonic activity of the Imandra-Kolvitsky fault in the south-west of the Kola Peninsula based on the synthesis of signs of seismogenic deformations in the relief, bedrock of the crystalline basement and loose sediments. The studied area is located in a through-tectonic depression, in the low-mountain Kandalaksha Tundra massif, occupied by the basin of Lake Sredne Luvengskoye. Previously, a focus of paleoearthquakes was established here due to the presence of seismic deformations of various types and ages. The tasks of the work included the creation of a combined detailed digital relief model in the lake bed and on the coastal territory; analysis of the structure of the relief and the distribution of tectonic deformations on the surface; analysis of the structure and hierarchy of segments of the Imandra-Kolvitsky fault and minor ruptures; analysis of the deep structure of the quaternary cover and its relationship with the relief of the basement with the identification of zones of faults and deformation anomalies. The main methods used were geological and geomorphological (morphogenetic, morphotectonic, morphodynamic, paleoseismic) and geophysical (ground penetration radar (GPR) and electrotomography (ET). The spatial and deep structure of the segments of the Imandra-Kolvitsky fault in relation to deformations of sediments and the surface of the basement and the probable period of maximum activity of 14.9–10.3 thousand years have been determined.

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