Deterministic Seismic Hazard Analysis of Chittagong City and District, Bangladesh

Abstract

Chittagong District is one of the most significant and flourishing coastal regions in the southeastern part of Bangladesh. It lies in the active tectonic framework which has experienced several major earthquakes in the past. Due to its economic, cultural, and military significance, it is of utmost importance that the structures are safe from seismic hazards. Seismicity database of M<inf>w</inf>≥3 from 1900 to 2020 has been used to provide extensive insight into historical earthquakes and also facilitate accurate predictions. The seismic sources have been adopted from the seismotectonic Atlas of India and adjoining regions with a control region of radius 500 km from the political boundary of Chittagong District. The Peak Ground Acceleration (PGA) values were computed at the bedrock level, surface level PGA was calculated using the NEHRP soil amplification relations for Chittagong City, and corresponding response spectrum was plotted. Using these PGA values, hazard contours for the Chittagong City and District have been developed for the ease of seismic design of structures in the future. © 2021 American Society of Civil Engineers (ASCE). All rights reserved.