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scheme starting from a layered earth model. Its main utility is to examine a dispersion analysis scheme to process passive surface waves in association with such source

characteristics as location, spectral content, relative power between different modes, repetition, etc., and also with receiver array characteristics such as shape, size, number

of channels used, etc. It calculates arrival times of all the frequencies being considered at each receiver location. Geometric (cylindrical) damping and attenuation (Q-factor)

effects are taken into account as an amplitude-modulation factor. In the case of multiple sources and modes, the same calculation is repeated independently for each source

and each mode, and then individual results are vertically stacked together to constitute the final seismogram (seismic trace). Mathematical formulations are described below

and a sample modeling is illustrated in

different source points of different intensities scattered around the array. Two

dispersion modes are incorporated in the modeling to generate the 10-sec long

field record.