Seismic Site Amplification Characteristics of Makran Subduction Zone Using 1D Non-Linear Ground Response Analysis
Source abstract
Abstract
The Makran Subduction Zone (MSZ) is a tectonic plate boundary where the Arabian Plate is subducting beneath the Eurasian Plate. This study investigated the dynamic response in the Gwadar region, located in the eastern part of the MSZ. A suite of seismic records compatible with the Building Code of Pakistan (BCP:2021) rock design spectrum was used as the input ground motions at the bedrock. The amplification characteristics were assessed through a series of one-dimensional (1D) site response analyses utilizing a non-linear (NL) approach. The results revealed significant de-amplification in soft soils at short spectral periods. A general depth-wise decrease in the shear stress ratio and peak ground acceleration values was observed, influenced by shear-strain-induced effects and shear wave velocity reversals within the site profiles. The code spectra, compared to the proposed design spectra, underestimated the site amplification for stiff soils (i.e., Site Class D) for periods of less than 0.32 s and overestimated it for soft soils (i.e., Site Class E) across all periods. These findings underscore the necessity for site-specific ground response analyses, particularly within the framework of the China–Pakistan Economic Corridor (CPEC).
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Research context
OpenAlex topics: earthquake and tectonic studies · High-pressure geophysics and materials · Seismic Waves and Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Civil Engineering, University of Engineering & Technology (UET), Taxila 47050, Pakistan
Department of Civil Engineering, National University of Technology, Islamabad 44000, Pakistan
NUST Institute of Civil Engineering, National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan
Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Republic of Korea
Faculty of Engineering, Sohar University, P.O. Box. 44, Sohar 311, Oman
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