УДК 550.23 | DOI: 10.21440/0536-1028-2019-8-68-80 | Download |
Guliaev A. N., Osipova A. Iu. Zones of possible sensible earthquake foci in the Urals. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 8: 68–80 (In Russ.). DOI: 10.21440/0536-1028-2019-8-68-80
Abstract
Introduction. Modern Ural mountains represent contemporary epiplatform Epi-Paleozoic orogeny which presumably originated within the last 30 million years in the western part of a more ancient pre-Paleozoic-Paleozoic folded zone, the central part of which is ancient (Riphean-Vendian) Central-Ural High. In Mesozoic-Cenozoic Period, the activity of tectonic and volcano-magmatic processes in the subsoil of the Urals has fallen, and the Urals entered the period of platform development, which is characterized by slowcontinent-forming movements of the earth’s crust. Within over the last 30 million years in the epoch of Alpine tectogenesis, there has been the renewal of the Ural mountain belt. This process continues at the modern period and is accompanied by rare sensible earthquakes with the magnitude from 3–4 to 5–6 on
MSK-64 scale; they are not hazardous for engineering structures and people.
Research aim is to estimate the connection between seismin activity of the Urals and heterochronous geological-tectonic structures, and draw a scheme of possible sensible earthquake foci (zones of PSE).
Research methodology included the estimation of spatial epicenters of sensible earthquakes in the central part of the Urals relative to Paleozoic and pre-Paleozoic geological-tectonic structures.
Research results made it possible to state that epicenters of sensible earthquakes in the central part of the Urals are concentrated within the limits of the Middle Urals and the adjoining parts of the North and South Urals and are localized mainly in submeridional zones, from the west and from the east embracing the region of pre-Paleozoic Central-Ural High formed by metamorphic rock. The mentioned zones may be considered as the zones of PSE, and the region of the Middle Urals and the adjoining parts of the North and South Urals – as a region of possible earthquakes foci with a magnitude up to 5–6 on MSK-64 scale.
Key words: contemporary epiplatform Epi-Paleozoic orogeny; epoch of Alpine tectogenesis; Central-Ural High; zones of possible sensible earthquake foci (PSE).
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Received 6 September 2019