Abstract
Array measurements of microtremors at 16 sites in the city of Thessaloniki were performed to estimate the V s velocity of soil formations for site effect analysis. The spatial autocorrelation method was used to determine phase velocity dispersion curves in the frequency range from 0.8–1.5 to 6–7 Hz. A Rayleigh wave inversion technique (stochastic method) was subsequently applied to determine the Vs profiles at all the examined sites. The determination of V s profiles reached a depth of 320 m. Comparisons with V s values from cross-hole tests at the same sites proved the reliability of the SPAC method. The accuracy of the V s profiles, the ability to reach large penetration depths in densely populated urban areas and its low cost compared to conventional geophysical prospecting, make Mictrotremor Exploration Method very attractive and useful for microzonation and site effects studies. An example of its application for the site characterization in Thessaloniki is presented herein.
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