Liquefaction hazard mapping at the town of Edessa,Northern Greece |
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Authors: | George Papathanassiou Sotiris Valkaniotis |
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Institution: | (1) Department of Geology, Aristotle University of Thessaloniki, Egnatia Str., 541 24 Thessaloniki, Greece |
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Abstract: | The town of Edessa is located on Northern Greece at a region that is characterized as low seismicity zone due to the fact
that few moderate events of M < 6 occurred during the last century. According to the Greek Seismic Code, the expected acceleration having a 10% probability
of being exceeded in 50 years is equal to 0.16g. However, an amplification of ground motion is likely to occur due the local geology that is consisted of Holocene fluvio-torrential
deposits. The basic aim of this paper is to evaluate the site amplification due to geological conditions and to assess the
liquefaction hazard. In order to achieve this, 1-D site response analyses were performed. The data that were employed for
the construction of the numerical models have been collected from borings with standard penetrations tests (SPT) that were
drilled for construction purposes. Afterward, the liquefaction potential of the subsoil layers was evaluated taking into consideration
two seismic scenarios. The first scenario was based on the seismic parameters, earthquake magnitude and PGA, assigned by the
Greek Seismic Code. On the second seismic model, we employed the values of acceleration, resulted from the 1-D analyses and
the earthquake magnitude as it was defined by the Greek Seismic Code. In order to compile the liquefaction hazard maps, we
initially estimated the liquefaction potential index (LPI) of the soil columns using the parameters provided by SPT, for both
seismic loadings, and afterward we correlated these values with the proposed classification of the severity of liquefaction-induced
deformations. In addition, having computed the value of probability based on the LPI, liquefaction manifestations probability
maps were compiled for both scenarios. The result of this study was that liquefaction-induced ground disruptions are likely
to occur at the center of the city, among the branches of Voda River, only when the amplified values of acceleration are taken
into account to the computation of liquefaction potential. |
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