A Comprehensive Comparative Study on Various Parameters by Using Microtremor Data

To perform the microzonation, site characterization and site response analysis play a crucial role. The sites can be efficiently characterized only when the basic parameters are correctly estimated. The 5 sites are selected in IIT (ISM) Dhanbad, Jharkhand, and the data is recorded using microtremor and this data is recorded in the summer and monsoon seasons of the year (2021). The authors have tried to record the data with less amount of anthropogenic noise. The five seismic parameters are comparatively computed, shear wave velocity (Vs), predominant frequency (f0), compressional wave velocity (Vp), H/V ratio, Poisson’s ratio, and the phase velocity of Rayleigh waves. The drastic variations in these parameters are observed for the upper portion of the ground, so the results can affect the seismic hazard analysis. The H/V ratio is higher in monsoon with a shift in f0. The variation in Vs is also drastically reduced (up to 10 m) during monsoon and Vp varies slightly increases, which results in the increase in Poisson’s ratio. This study may have a broader field of applications like in geotechnical and agricultural engineering projects.