Geophysical investigation of jamshedpur city Using active multi channel analysis of surface Waves

Abstract

Multichannel Surface Waves Analysis (MASW) technique has gained significant popularity newlineas a non-invasive seismic exploration method for geotechnical site characterization since its newlineinception in the late 1990s. In comparison to conventional borehole sounding experiments, newlinethe assessment of subsurface Vs profiles across large areas is a more economical approach. newlineThe MASW survey comprises three primary stages, namely field data acquisition, newlinedispersion analysis, and inversion analysis. During the data acquisition process, seismic newlinewaves generated by active or passive sources are detected by a predetermined configuration newlineof geophone receivers. The dispersion analysis encompasses further processing of the newlinegathered wave field in order to deduce the relationships between frequency and phase newlinevelocity. These relationships illustrate the dispersion trends, which can be either unimodal newlineor multimodal. The inversion analysis is applied to the dispersion curve in order to obtain newlinethe Vs profile of the underlying substrate in one-dimensional (1-D), two-dimensional (2-D), newlineor three-dimensional (3-D) formats. The correlation between Vs and soil stiffness is widely newlineacknowledged as a fundamental engineering parameter for evaluating the dynamic newlinecharacteristics of soil. Nevertheless, the procedure for ascertaining the profile of Vs is newlineinherently complex and rigorous, as it encompasses the analysis of recorded unprocessed newlinesignals, estimation of dispersion images, and inversion of profiles. The main goal of the newlineMASW technique is to obtain a dispersion image with a high level of detail. The precision newlineand dependability of the result are significantly impacted by the resolution of the dispersion newlineimage.