№58
June 2017
ISSN
1990-4126

Russian

«Architecton: proceedings of higher education» № 35 September 2011

City as ecosystem


Gulyaev Alexander N.

Senior Researcher, Laboratory of Seismometry,
Institute of Geophysics, Ural Division of the Russian Academy of Science,
Ekaterinburg, Russia usc_alex@mail.ru

Osipova Anastasia Yu.

PhD (Geology and Mineralogy), Assistant Researcher,
Seismometric Laboratory Institute of Geophysics,
Ural Division of the Russian Academy of Sciences,
Ekaterinburg, Russia

SEISMICITY AND SEISMIC ZONING OF EKATERINBURG AND ADJACENT POTENTIAL DEVELOPMENT AREAS


Based on the results of General Seismic Zoning of the Russian Federation (OSR-97), the Middle Urals have been classified into the class of areas where seismic activity is to be taken into account in building design and construction. Ekaterinburg and its adjacent prospective development areas are located within potentially seismic zones. This has made it necessary to do a detailed zoning of this territory based on estimated seismic impact. This study is based on analysis of data on a) the structure of the upper part of the earth crust; b) physical and mechanical properties of soils and rocks; c) baseline seismic impact on civil engineering objects of different degree of criticality in respect of seismic safety (according to OSR-97).

The results of the study suggest that the seismic conditions in Ekaterinburg and adjacent potential development areas are favourable and safe for the majority of civil engineering objects owing to the following factors: low seismic activity of the earth crust in the Middle Urals (perceptible earthquakes are seldom and their intensity is insignificant, from 3-4 to 6.0-6.5 by the MSK-64 scale); b) favourable seismic conditions in terms of geology (the territory under consideration has mostly Palaeozoic bedrock covered with a relatively thin layer of residual soil and Quaternary sediments). Antiseismic safeguards within the territory considered are reasonable only in relation to the design and construction of high-rise buildings higher than 40 stories and of environmentally hazardous industrial facilities.

Geologically, the most adverse factor for civil engineering objects within this territory is the one that may be conditionally called geodynamic. It manifests itself in the form of variations over time in horizontal and vertical distances of the earth surface as revealed by GPS monitoring. These variations are, presumably, caused by seasonal variations in the temperature of the soils and rocks in the active layer (the top 7-10 metres of the earth crust) and, probably, by other global seasonal processes. Unlike perceptible earthquakes, the geodynamic factor operates continuously and is likely to be causing accidents in buried lines, accelerated wear of the road surfacing and, in some cases, damage to building foundations and walls.

The tectonic activity of the earth crust in the territory under consideration has been low during recent history and presently. No zones of deformation of the earth crust that may be classified as «an active fault» have been revealed in this territory.

Key words: seismic zoning, latest tectonics, earthquake focus, seismic engineering conditions


Russian text of this article

ISSN 1990-4126  Registration MCM el. № ФС 77-50147 of 06.06.2012 © USUAA, 2004-2017  © Architecton, 2004-2017