Issue 4(44), 2016

DOI 10.21440/2307-2091-2016-4-45-49

Seismicity of Ural and adjacent territories pdf

A. N. Gulyaev

Modern Ural mountains are the recent epiplatform orogen that was formed for the last 30 million years in the western part of more ancient Paleozoic mountain fold belt that occurred at the end of Paleozoic on the border of East-European platform (EEP) and Western-Siberian slab and demolished by weathering processes during mesozoic-kainozoic time. The establishing of the newest Ural mountain belt and adjacent territories on the modern stage are supported by rarely occurring sensible earthquakes with a magnitude from 3–4 to 5–6 grades on MSK-64 scale. Majority of epicenters of sensible earthquakes are concentrated within the boundaries of Sredne-Uralsk seismic domain that is confined to the interference region of submeridional Ural and north-eastern outskirts of Russian EEP platform that has northwestern direction. In the area to the west from Ural rarely occurring sensible earthquakes are registered in submeridional Kirovsk-Kazhimskiy aulacogen. In the area to the east from Ural sensible earthquakes were registered in the region of town Ishim of Tyumen oblast. Sources of sensible earthquakes of examined region are localized predominantly in crystalline basement at depths from a few kilometers to 25 km. For the last 300 years within the limits of examined region there were around 50 sensible earthquakes with intensity from 3–4 to 5–6 marks on MSK-64 scale. At large engineering-seismic condition at Ural and in adjacent to it regions are considered to be favorable and safe for engineering structures that are built in accordance with the construction norms and regulations.

Keywords: newest orogeny; sensible natural earthquakes; seismicity; earthquake sources; earthquake intensity; seismic domain; potentially seismic areas.

 

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