Allocation of zones with different responses of ground movement individual indicators to standard seismic impact

Geophysical Institute of the Vladikavkaz Scientific Center of the Russian Academy of Sciences, 362002, Vladikavkaz, Russia

^* Corresponding author: vzaal@mail.ru

Abstract

The paper presents the results of calculating the vibrations of the soil strata using the ZOND- (linear) program. Accelerograms of earthquakes recorded in Tbilisi (12/14/2000) and Athens (09/7/1999) on rocky soils were set as a standard seismic action in the bedrock of a loose soil layer. The maximum amplitudes of records and the soil vibrations real spectrum areas were considered as the soil movement indicators. The ratios of the presented indicators to the corresponding values of the initial values were calculated. The results obtained in the form of the indicators’ ratios for the soil movement in the areas under consideration were used to differentiate soils by their response to standard seismic action. Differentiation of soils in the corresponding areas was carried out in three groups according to the value of this ratio. The zones of soil reaction to the standard seismic action were identified. The sites of the third group are tentatively assigned to the most dangerous areas in terms of seismicity. Due to the fact that the calculations were based on a linear-elastic representation of the soils’ behavior, typical for small deformations, the data obtained are preliminary methodological in nature and will be refined in the future.