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Deep soil seismic hazard assessment: analyzing the impact of local site effects by stochastic site response analysis—a comparative approach

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Abstract

Incorporating local site effects into seismic hazard analysis, especially for deep soil sites, is crucial. This study describes probabilistic seismic hazard analysis (PSHA) incorporating site effects for a deep soil site in Pakistan. Bedrock hazard is assessed in FRISK88M using a rigorous logic tree. Equivalent linear site response analysis (SRA) is performed in STRATA and captured the soil variability properties via Monte Carlo simulations. We proposed a hybrid approach in this study which utilizes the outcomes of Random Vibration Theory (RVT) and multiple Time Histories (TH) approach to assess the site-specific amplifications. Incorporating site amplifications transforms rock ground motion models into site-specific then we performed soil PSHA in FRISK88M. The analysis revealed that RVT overpredicts (3–17%) while TH underpredict (1–6%) hazard as compared to the hybrid approach at all return periods. The hybrid approach proposed in this study provides an innovative, effective and reliable estimates.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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The author and co-authors are responsible for the study conception and design, data collection, analysis and interpretation of results, and manuscript preparation.

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Correspondence to Muhammad Salman Ali or Luo Dong.

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The authors have no relevant financial or non-financial interests to disclose.

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Ali, M.S., Saeed, K., Jianxun, M. et al. Deep soil seismic hazard assessment: analyzing the impact of local site effects by stochastic site response analysis—a comparative approach. Bull Eng Geol Environ 83, 237 (2024). https://doi.org/10.1007/s10064-024-03720-y

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  • DOI: https://doi.org/10.1007/s10064-024-03720-y

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