Seismic Microzonation of Urmia City by Means of Microtremor Measurements (original) (raw)

In order to perform seismic microzonation of Urmia city, northwest of Iran, microtremor measurements were carried out in more than 200 points. Simultaneous measurements were done at soil and rock stations in the city. To make use of the measured data two commonly used methods, i.e. Hs/Hr and H/V spectral ratios, were employed. Conclusions were displayed in term of transfer function shape, fundamental frequency and amplification factor. Sites on sediment categorized into two near and far from their reference sites. It’s shown that in the far case sites, H/V method gives better results. However, in the near case sites, H/V method achieves very good results too. Comparison between these two methods showed that H/V technique is more applicable to microtremors. In addition H/V method was attempted using different spectral analysis. The advanced segmental cross-spectra method was compared with the conventional methods of Fourier spectra, power spectra, and cross spectra. Results showed th...

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