Ground that is subjected to dynamic loadings behaves in differing ways even over short distances. This study examined the effects of firmness of ground on wave dispersion using multichannel analysis of surface waves. Surface waves in different grounds were recorded in the same layout order using the Multichannel analysis of surface waves method (MASW). Seismic recordings, dispersion images and 1-D shifting wave velocity of surface waves were compared for different geological units. The first stage in analysis of surface waves is to obtain preliminary information about the firmness of the environment of surface wave recording. The arrangements in order to increase S/N (Signal/Noise) proportion in forming the dispersion curve allows more accurate calculation of shifting wave velocity. This enables accurate and efficient calculation of seismic base depth.


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