NC92Soil: A computer code for deterministic and stochastic 1D equivalent linear seismic site response analyses

The extensive evaluation of the impact of local seismo-stratigraphic configurations on seismic ground motionpresents significant challenges due to the necessity of considering the combined effects of uncertainty and smallscale lateral variability of the relevant parameters. To effectively explore these sources of uncertainty, a newPython-based computer program is proposed for one-dimensional seismic site response simulations, adopting theequivalent linear viscoelastic approach in the frequency domain. With respect to existing software, the codeintroduces new pre- and post-processing features, which also meet the specific requirements of seismic microzonation studies. Within the code, the complete spectrum of uncertainties related to local seismo-stratigraphicconfigurations, including lithotype successions, layer thicknesses, and seismic and geotechnical properties forthe considered lithotypes, is managed by considering user-defined constraints and statistical properties of therelevant parameters. Additionally, a batch approach is offered, enabling the application of the procedure to anunlimited number of different scenarios. To demonstrate the potentiality of the proposed code, a comprehensiveset of 90,000 local seismic site response analyses was conducted, showing a clear correlation between theamplification factors, the mean shear wave velocity in the upper 30 m, the fundamental frequency of the depositand the depth to the seismic bedrock.