Morphotectonics, Seismicity, and Exogenous Processes of the Kola Peninsula

Shvarev, S.V.

Автор: Shvarev S.V.
Журнал: Russian Geology and Geophysics
Том: 63
Номер: 8
Год издания: 2022
Издательство: ELSEVIER SCIENCE BV
Местоположение издательства: PO BOX 211, AMSTERDAM, NETHERLANDS, 1000 AE
Первая страница: 940
Последняя страница: 954
Оригинальные версии: МОРФОТEКТОНИКА, ДЕФОРМАЦИИ РЫХЛЫХ ОТЛОЖЕНИЙ И ЭТАПЫ ТЕКТОНИЧЕСКОЙ АКТИВИЗАЦИИ САМБИЙСКОГО (КАЛИНИНГРАДСКОГО) ПОЛУОСТРОВА В ПОЗДНЕМ ПЛЕЙСТОЦЕНЕ И ГОЛОЦЕНЕ
DOI: 10.2113/rgg20204310
Аннотация: The purpose of this study is to determine a morphologically pronounced fault–block structure identified with the neotectonicstage and compare it with sites with manifested exogenous processes, as well as modern and historical paleoseismicity in order to establishfaults activated in the postglacial time. Based on the analysis of space images (Landsat-ETM+) and a digital elevation model (GTOPO-30),the territory of the Kola Peninsula and the adjacent part of North Karelia is subjected to morphostructural interpretation with identifyingmorpholineaments and an elementary block structure. It is shown by the analyzing the directions and extent of elementary, single (simple),and complex (echeloned, parallel conjugated, and imbricated) linear structures and their zones that both linear (fault) and areal (block)structures are characterized by a predominance of a single system of northwestern and northeastern differences with a clear dominance of theformer and unimodal distribution of the extent of faults and the area of blocks, depending on their number. This indicates a single (recent)stage in the formation of the morphotectonic appearance of the territory and no discrete hierarchy of the morphostructures. The degree offragmentation of the territory at different depths is calculated depending on the number and extent of morpholineaments. It is determinedthat morpholineaments have a high degree of inheritance from Archean–Proterozoic structures (≈50%). Elementary morphotectonic blocksare grouped into composite blocks bounded by linear zones of great extent (100–600 km) having individual physiognomic features determined by fault patterns, which indicates the nature of the neotectonic dynamics and the degree of inheritance or reformation of the structuralplan. The localization of manifestations of exogenous processes, epicenters of paleo-, historical, and modern earthquakes is determined onthe basis of the analysis of topographic maps scaled at 1:100,000, catalogs of historical and paleoearthquakes, and the consolidated literature(including the data obtained by the authors of this study) on paleoseismic deformations. A geoinformation base is compiled, which is used tosimulate the spatial distribution of endo- and exogenous signs of tectonic activity and compare it with the neotectonic fault–block structure.The spatial similarity of endogenous and exogenous activation zones and their confinement to faults, defined as activated in the postglacialtime, are revealed. It is revealed that the following elements are most active in the postglacial–Holocene. First, flank elements on the KolaPeninsula along the Barents Sea coast, the Kandalaksha Bay shores, and the Gorlo Strait of the White Sea. Second, the central (nodal) partwith the Khibiny and Lovozero massifs. Third, submeridional (transverse) secant structures separating the eastern part of the peninsula fromthe western part (Khibiny–Kola and Khibiny–Niva). The spatial parameters of the activated zones indicate a range of earthquake magnitudes M ≈ 6.5–7.5 generated by these structures both in the postglacial period and in the Neopleistocene as a whole.Keywords: Morphotectonics, active faults, recent fault–block structure, morpholineaments, seismicity, paleo-earthquakes, exogenous processes, Kola Peninsula
Добавил в систему: Шварев Сергей Валентинович

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Morphotectonics, Seismicity, and Exogenous Processes of the Kola Peninsulaстатья

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