Determination of S-wave velocity structure using microtremors and spac method applied in Thessaloniki (Greece) |
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| Authors: | Paschalis Apostolidis Dimitrios Raptakis Zafeiria Roumelioti Kyriazis Pitilakis |
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| Institution: | a Department of Civil Engineering, Aristotle University of Thessaloniki, P.O. Box 450, GR-54124, Thessaloniki, Greece;b Department of Geology, Aristotle University of Thessaloniki, P.O. Box 352-1, GR-54124, Thessaloniki, Greece |
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| Abstract: | Array measurements of microtremors at 16 sites in the city of Thessaloniki were performed to estimate the Vs 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 Vs profiles reached a depth of 320 m. Comparisons with Vs values from cross-hole tests at the same sites proved the reliability of the SPAC method. The accuracy of the Vs 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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| Keywords: | Shear wave velocity Stationary random functions Spatial autocorrelation method Bessel functions S-wave inversion Site characterization 2D cross-sections 3D mapping |
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