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Macroseismic Manifestation of Seismic Events of Different Intensity on Territory of Vladikakaz

Each perceptible earthquake provides unique information about its real manifestation on the investigated territory. That is why the data on the manifestation of even a weak earthquake are important for creating and refining seismic hazard maps of various levels. The analysis of available data of macroseismic survey of historical and past earthquakes on the territory of Vladikavkaz is carried out in the paper. The results of the macroseismic survey are compared with the current map of seismic microzonation. The earthquakes with the greatest intensity in the area under research are generated by seismic sources in the territory of neighboring Georgia, as well as the powerful Vladikavkaz fault M = 7.1 and others characterized by although relatively smaller seismic potential, but nevertheless, a noticeable hazard level of local seismic sources. So, quite strong earthquakes of 1915 and 1929, in Vladikavkaz, reached an intensity of 6-7 degree. At the same time, earthquakes generated by local seismic sources (1872, 1874, 1922) appeared with the same magnitude here. The paper shows that macroseismic data are a reliable basis for differentiating the territory according to local, including seismic, properties. The paper provides a rather detailed analysis of the manifestation of the earthquake of January 7, 2005, with the intensity of 3-4 points on the territory of Vladikavkaz, which, despite the low class of the event, made it possible to consider it as a direct indicator of the seismic properties of the soils. Keywords—intensity; seismic effect; macroseismic manifestation; seismic hazard; engineering and geological conditions; seismic microzonation