Assessment of seismic hazard including equivalent-linear soil response analysis for Dhaka Metropolitan Region, Bangladesh

Masoud Mojarab (), Nazi Norouzi, Mahdokht Bayati, Zeinab Asadi, Mohamad Eslami, Mohsen Ghafory-Ashtiany, Abdul-Latif Helaly and Sara Khoshnevis
Additional contact information
Masoud Mojarab: Bonyan Zamin Paydar Consulting Engineers
Nazi Norouzi: Bonyan Zamin Paydar Consulting Engineers
Mahdokht Bayati: Bonyan Zamin Paydar Consulting Engineers
Zeinab Asadi: Bonyan Zamin Paydar Consulting Engineers
Mohamad Eslami: Bonyan Zamin Paydar Consulting Engineers
Mohsen Ghafory-Ashtiany: International Institute of Earthquake Engineering and Seismology
Abdul-Latif Helaly: Rajdhani Unnayan Kartripakkha, Urban Resilience Project
Sara Khoshnevis: Protek-Yapi Consulting Engineers

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 117, issue 3, No 41, 3145-3180

Abstract: Abstract Dhaka is one of the most populated cities in the world, which means that the occurrence of natural hazards will put the city in a critical situation. A seismic hazard analysis (SHA) is a prerequisite to reduce the risk of an earthquake event in Dhaka. This paper, focusing on the active faults of Bangladesh and the soil condition, represents the calculation of the peak ground acceleration (PGA), spectral acceleration (SA), and amplification factor. The analysis here used an updated seismic catalog (up to 2020), three source models (linear, areal, and smoothed seismicity), and eight attenuation models (selected by ranking techniques). Data from drillings are used to build the soil model, and one-dimensional frequency-domain equivalent-linear analysis is applied to calculate the amplification factor and the acceleration on the surface. The results show that the PGA changes from 0.14 to 0.19 and from 0.33 to 0.46 on bedrock for a return period of 475 and 2475 years, respectively. The worst-case scenario for Dhaka is the movement of the Jamuna Fault (Madhapur section), which can cause a PGA from 0.08 to 0.68 on bedrock. The results also suggest that the soil can amplify the acceleration up to 2.4 times. PGA on the surface for the return period of 475 years varies from 0.18 to 0.41. The design spectra and zonation maps are presented in the paper.

Keywords: Seismic hazard analysis; Site effects; Bangladesh; The Dhaka Metropolitan Region; OpenQuake (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-023-05981-4

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