Regional seismic site response assessment in the deep Bengal Basin, Bangladesh, from simulated far-field earthquake ground motions
Abstract
Abstract Bangladesh is vulnerable to large earthquakes because of its location within the active Eurasia–India–Burma plate tectonic system and the widespread occurrence of thick soft sediments across the Bengal Basin. The long-period shaking of high-rise buildings in the Bangkok Basin during the 2025 MW 7.7 Myanmar earthquake highlighted the importance of understanding the response of deep sedimentary basins to far-field earthquakes. In Bangladesh, the Bangladesh National Building Code (BNBC) adopts V_S30 based seismic site characterization, where the influence of deep, soft sedimentary sequences on site response remains undermined. This study presents the regional assessment of seismic site response in terms of elastic response spectrum at nineteen sites across the Bengal Basin using one-dimensional (1D) linear simulations of two far-field earthquake ground motions and deep shear-wave (S-wave) velocity (VS) profiles derived from a previous horizontal-to-vertical spectral ratio (HVSR) inversion study. Rather than quantifying absolute amplification, the study investigates the predominant response periods associated with the deep sedimentary sequences of Bangladesh. The reliability of the velocity models was evaluated through comparison with standard penetration test (SPT) based site classifications. Many stations exhibited dominant spectral periods approaching 1 s, exceeding the peak periods of the BNBC design spectra, with engineering bedrock depth being a controlling factor…
Read the paper
Related studies
- Current state and future directions for deep learning based automatic seismic fault interpretation: A systematic review
- Physics of Partially Saturated Porous Media: Residual Saturation and Seismic-Wave Propagation
- Modern Imaging Using Seismic Reflection Data
- Effects of marine seismic surveys on free-ranging fauna: a systematic literature review
- A review of the recent seismic activity in the southern part of egypt (upper egypt)
- A review of research on mechanism of seismic attenuation and energy compensation
Go deeper in Evidence Hub
Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.