Effect of Soil on Ground Motion Amplification of Kolkata City

This paper presents the ground motion amplification factors at different time period bands and fundamental time period of soft sedimentary deposit in densely populated Kolkata city for seismic microzonation. 1D seismic wave propagation technique SHAKE2000 is used for ground motion amplifications at different locations of Kolkata city. Fundamental time period (), amplification at fundamental time period, average amplification and amplification at different frequency band for soil columns are computed and corresponding contours are plotted for variety of end users. The study reveals that Kolkata may suffer severe damage even due to moderate earthquake.