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Soft soil effectively changes the behaviour of seismic wave propagation and this is important for urban areas. Waveform modelling is one of the methods we can go through site effect and check how the underlying structure could amplify incoming waveform and how will affect low and high rise buildings. In this study, we have monitored a situation with and without soft soil on some existing stations and have tried to explore how much the amplification factor could change. A hybrid technique of waveform simulation is used to create near broadband signals. The method combines numerical (Finite Difference) and analytical (Modal Summation) techniques. A major earthquake (Bam, 2003) southern Iran is selected. Vp, Vs, rigidity and attenuation factors (Qp, Qs) are considered as soil condition at each site. 1D, 2D and 3D evaluation are performed to evaluate the detail effects of real source, path and site conditions. This procedure is a complementary technique to deliver clear site condition for any seismic site selection as well. Results are compared with observed data both in time and frequency domain.
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Simulation techniques need to be considered in areas with a lack of data
