Seismic microzoning of the Tashkent territory based on calculation methods

This article considers the seismic microzoning of the territory of Tashkent based on calculation methods. The basis of the seismic zoning adopted values of the peak ground accelerations (PGAs) at the free surface. Calculations of the peak free surface accelerations were performed using the STRATA program developed by the Pacific Seismotechnical Research Center (USA). For the calculations, the following input parameters were given: the level of seismic influence on the rock base, the geoseismic parameters of the model soil column (a sequence of layers with a given capacity), the density, the propagation velocity of seismic waves, and the nature of the absorption of elastic energy in the layers for 36 seismic-geological models considering the soil strata response to the seismic impact of the set on a rocky half-space. For each model, the peak acceleration and maximum displacement on the free surface and their changes with depth, as well as the response spectra of the ground layer, were obtained. Seismic microzoning schemes for the city given the probability of an earthquake with return periods of 500 years and 2500 years were presented.

Automated summary

This article discusses the seismic microzoning of Tashkent territory based on calculation methods, using peak ground accelerations (PGAs) at the free surface as the basis for seismic zoning. Calculations were performed using the STRATA program developed by the Pacific Seismotechnical Research Center, considering 36 seismic-geological models for the soil strata response to seismic impact. Seismic microzoning schemes for the city were presented based on earthquake probabilities with return periods of 500 years and 2500 years.