RESEARCH ARTICLE
Assessment of Seismic Hazard of Territory on Basis of Modern Methods of Detailed Zoning and Seismic Microzonation
V.B. Zaalishvili1, *, E.A. Rogozhin2
Article Information
Identifiers and Pagination:
Year: 2011Volume: 5
First Page: 30
Last Page: 40
Publisher ID: TOBCTJ-5-30
DOI: 10.2174/1874836801105010030
Article History:
Received Date: 20/04/2008Revision Received Date: 4/03/2011
Acceptance Date: 7/03/2011
Electronic publication date: 10/6/2011
Collection year: 2011
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Abstract
The new complex method of seismic hazard assessment resulted in creation of the probabilistic maps of seismic microzonation is presented in this paper. To study seismicity and analyze seismic hazard of the territory the following databases are formed: macroseismic, seismologic databases and the database of possible seismic source zones (or potential seismic sources - PSS) as well. Using modern methods (over-regional method of IPE RAS - Russia) and computer programs (SEISRisk-3 – USA) in GIS technologies there were designed some probabilistic maps of seismic hazard for the Republic North Ossetia-Alania in intensity units (MSK-64) at a scale of 1:200 000 with exceedance probability being of 2%, 5%, 10% for a period of 50 years, which correspond to recurrence period of 2500, 1000, 500 years, correspondingly. Moreover, first the probabilistic maps of seismic hazard were made in acceleration units for the territory of Russia. The map of 5% probability is likely to be used for the large scale building, i.e. the major type of constructions, whereas the map of 2% probability should be used for high responsibility construction only. The approach based on physical mechanisms of the source is supposed to design the synthesized accelerograms generated using real seismic records interpretation.
For each of the zoning subject the probabilistic map of the seismic microzonation with location of different calculated intensity (7, 8, 9, 9*) zones is developed (the zones, composed by clay soils of fluid consistency, which can be characterized by liquefaction at quite strong influences, are marked by the index 9*). The maps in accelerations units show the similar results.
The complex approach based on the latest achievements in engineering seismology, can significantly increase the adequacy or foundation for assessments and reduce the inaccuracy in earthquake protected design and construction.
Realization of investigations on mapping of seismic hazards such as detailed seismic zoning (DSZ) based on the most advanced field research methods and analysis of every subject of the Northern Caucasus separately on a scale of 1:200 000 gives the possibility to merge a bit unavailable, at first glance, schemes into geologically and geophysically quite reasonable map of DSZ for the Northern Caucasus with equal scale system of the source zones.
