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The paper notes that in recent years, attention to the study of nonlinear phenomena in engineering seismology has sharply increased. The problem of accounting for nonlinear phenomena can be solved using instrumental and computational studies, as well as collaterally. In the latter case, the possible level of soil nonlinearity is estimated using the instrumental method, then the possible features of soil movements are calculated numerically. An algorithm for taking into account the nonlinearity of soils when calculating vibrations of the soil strata under intense seismic influences is proposed. The algorithm was developed on the basis of the known empirical relationships between the soil types and their indicators. The number of plasticity was chosen as an indicator of the soil type. Additionally, the necessary criteria and refinements have been introduced to correctly take into account the normal stress and calculate the deformation. The value of the shear wave propagation velocity in the soil, closely related to the physical state of the soil, is considered as a modulated indicator. The way of using the proposed algorithm for the method developed on the basis of the multiple-reflected waves theory and the method developed on the FEM basis is shown.

Accounting for nonlinear soil properties in the computational method of seismic microzoning