Local Peak Ground Acceleration from Probabilistic Seismic Hazard Assessment: Methodology and Application for Engineering Design in Bangladesh
DOI:
https://doi.org/10.64862/Keywords:
Probabilistic Seismic Hazard Assessment, Peak Ground Acceleration, Site Amplification, Vs30, Uniform Hazard SpectraAbstract
Probabilistic Seismic Hazard Assessment (PSHA) deals with a framework for determining seismic ground motion by combining seismic source zonation, earthquake recurrence and ground motion prediction and taking the respective uncertainties into account. This study converts regional PSHA results into local Peak Ground Acceleration (PGA) values, which are essential for earthquake-resistant structural design, for eight cities in Bangladesh – Barishal, Cumilla, Faridpur, Gopalganj, Khulna, Kushtia, Satkhira and Sirajganj. This procedure incorporates PSHA-derived engineering bedrock level hazard estimates and soil shear-wave velocity measurements from the top 30 meters (Vs30) to account for site amplification factors, enabling the calculation of local PGA values. The results are compared with the seismic design provisions of the Bangladesh National Building Code (BNBC, 2020), indicating differences between local Uniform Hazard Spectrum (UHS) and BNBC design spectra. The results emphasize the necessity of site-specific hazard assessments for safe and earthquake-resilient infrastructure planning in Bangladesh.
References
Azari Sisi, A., Hobiger, M., Kaiser, D, Spies, T., Schlittenhardt, J. (2021). Regional seismic hazard assessment in Bangladesh; Project: Geo-information for Urban Planning and Adaptation to Climate Change (GPAC); Bangladesh-German Technical Cooperation, 38 pp.
BNBC, 2020, Bangladesh National Building Code, Bangladesh Gazette (S.R.O No. 55-Law/2020). Ministry of housing and public works, Government of the People’s Republic of Bangladesh, 2461 pp.
Hashash, Y. M. A., Ilhan, O., Harmon, J.A., Parker, G.A., Stewart, J. P., Rathje, E.M., Campbell, K.W., Silva, W.J. (2020). Nonlinear site amplification model for ergodic seismic hazard analysis in Central and Eastern North America. Earthquake Spectra, 36(1), 69-86. https://doi.org/10.1177/8755293019878193.
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