Abstract <p>The paper presents new data on the age of seismic manifestations in the focal zone of paleoearthquakes on the western wall of the Imandra neotectonic depression (Kola Region, NE Fennoscandian Shield). Detailed paleoseismological studies have been carried out to study unconsolidated sediments and soils in the zone of an active fault structure: the Chuna seismic dislocation. New evidence of Late Pleistocene–Holocene earthquake traces has been found in Quaternary sediments and lacustrine sediments. Based on a combination of methods—isotopic (<sup>14</sup>C), luminescence (IR-OSL), geomorphological, and correlation—a previously unknown sequence of five events was established: 11.6 ± 0.5, 9.1 ± 0.2, 8.3 ± 0.2, 6.5 ± 0.4, and 2.45 ± 0.35 ka BP (calibrated). It reflects multiple noncoeval activations of the fault and seismic events that occurred in the central Kola Region throughout the Late Glacial and during the Holocene. This made it possible to significantly organize earlier existing information about the timing of paleoearthquakes in the central Kola Region. The results of the study significantly expand and complement paleoseismic catalogs. They reveal new evidence of prehistoric earthquakes in the region and are aimed at reducing the risks of natural destructive processes.</p>

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New Data on the Age of Paleoearthquakes in the Focal Zone in the Central Kola Region (Northwest Russia)

  • S. B. Nikolaeva

摘要

Abstract

The paper presents new data on the age of seismic manifestations in the focal zone of paleoearthquakes on the western wall of the Imandra neotectonic depression (Kola Region, NE Fennoscandian Shield). Detailed paleoseismological studies have been carried out to study unconsolidated sediments and soils in the zone of an active fault structure: the Chuna seismic dislocation. New evidence of Late Pleistocene–Holocene earthquake traces has been found in Quaternary sediments and lacustrine sediments. Based on a combination of methods—isotopic (14C), luminescence (IR-OSL), geomorphological, and correlation—a previously unknown sequence of five events was established: 11.6 ± 0.5, 9.1 ± 0.2, 8.3 ± 0.2, 6.5 ± 0.4, and 2.45 ± 0.35 ka BP (calibrated). It reflects multiple noncoeval activations of the fault and seismic events that occurred in the central Kola Region throughout the Late Glacial and during the Holocene. This made it possible to significantly organize earlier existing information about the timing of paleoearthquakes in the central Kola Region. The results of the study significantly expand and complement paleoseismic catalogs. They reveal new evidence of prehistoric earthquakes in the region and are aimed at reducing the risks of natural destructive processes.