2024 Volume 10 Issue 58 Pages 2181-2186
Most parts of North-East (NE) India have witnessed a number of devastating earthquakes time to time. Guwahati being one of the important cities of Assam, NE India, with seismic zone V, has the highest zone factor (as per Indian Standard code). With the rapid urbanization and increasing population, the need of site-specific hazard assessment is in great demand in this city. This study attempts to determine the surface level Response Spectra (RS), Amplification Factors (AF) for PGA, Fourier Amplitude Ratios (FAR) for Guwahati. The soil properties at various locations are collected from the micro-zonation atlas for the region and these data are correlated with the VS30 values. The material properties have been estimated using the standard reference curves. One dimensional (1D) equivalent linear approach has been adopted in this study. Spectrum compatible earthquake ground motions have been constructed as input motions for the ground response analysis, based on the Probabilistic Seismic Hazard Assessment (PSHA) results for the region. It has been observed that the local site-effects can significantly amplify the ground motions. Hence, the results are expected to give a good insight for the site-specific studies of Guwahati and be useful for future planning and design of structures.
