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Geotechnical and Geological Engineering, vol.42, no.8, pp.7577-7596, 2024 (ESCI)
Seismic microzonation is performed to assess the seismic risk in an area. In this paper, seismic microzonation for Lahore, Pakistan has been carried out. Firstly, the Geotechnical and geological properties of soils in the region were classified based on 119 boreholes. Two downhole tests were performed to measure the dynamic in-situ properties of soil. The design spectra for Lahore city from BCP 2007 and 2021 were used as target spectra to develop two synthetic acceleration time histories respectively. Afterward, one-dimensional non-linear site response analysis was performed at 33 sites having depth of 30 m for evaluation of parameters such as peak ground acceleration and spectral acceleration at the ground surface. Major seismic hazards considered for the seismic risk assessment are (1) peak ground acceleration at the ground surface, (2) surface spectral acceleration and (3) spectral amplification in the top 30 m of soil. All the major hazards estimated above were also used to prepare a seismic risk map of Lahore. Additionally, two site-specific design spectra were proposed in accordance with the soil classes D and E. The results of this study demonstrate the importance of micro-scale seismic studies to quantify the seismic risks associated with earthquakes.