Preliminary Assessment of Input Parameter Variability in 1D Site Response Analyses

Date

2025-11-07

Author

Muratoğlu, Gamze
Askan Gündoğan, Ayşegül

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Accurate estimation of site response is important for seismic hazard and risk assessments. Conventional one-dimensional (1D) analyses, however, usually rely on fixed values for input parameters such as shear-wave velocity, damping ratio, unit weight, and layer thickness. In practice, these parameters have inherent uncertainties that can significantly affect site response predictions. This study presents preliminary work on evaluating the influence of input parameter variability on 1D site response analyses. Equivalent-linear analyses are performed in DEEPSOIL for a representative soil profile, with variations applied to key parameters (e.g., shear-wave velocity, damping). Resulting site response parameters such as peak ground acceleration (PGA), spectral accelerations at 0.2 s and 1.0 s, and the fundamental frequency (f₀) are compared across scenarios. Initial results highlight the relative importance of uncertainty in key parameters, especially shear-wave velocity, in the variability of the site response. The outcomes aim to guide future probabilistic modeling efforts and provide insight into which parameters should be prioritized during field investigations.

URI

https://hdl.handle.net/11511/118041

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Department of Civil Engineering, Conference / Seminar