Seismic microzonation of Chania, Crete (Greece) based on SASW measurements and non-linear site response analyses
2013
Pelekis, P.C. | Athanasopoulos, G.A.
Following a brief overview of past applications of, and more recent advances on seismic microzonation, the results of a seismic microzonation study for the city of Chania, Greece, are presented. The study was based on Vₛ vs. depth profiles obtained at 19 sites of the urban area by performing SASW measurements. The spatial distribution of Vₛ values was utilized in estimating Vₛ₃₀ values, depth to bedrock and the fundamental ground period variation across the area of the city as well as for conducting 1-D finite element non-linear inelastic site response analyses. The input earthquake excitations employed in the response analyses were based on the results of an available seismic hazard study for the Chania Area. The results of analyses were utilized for establishing the spatial distribution of rock motion amplification, the expected ground motions and spectral values in the area of the city. Contour maps providing values of the expected ground motion in the urban area are given which may become a practical tool in assessing the seismic risk and expected damage in the Chania area. The maps can also be used in the design of new earthquake resistant structures or the seismic retrofitting of existing ones. Finally, the results were utilized to demonstrate the inadequacy of using Vₛ,₃₀ values for classifying the soil conditions in the Chania area.
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