Evaluation of ground motion characteristics,effects
of local geology and liquefaction susceptibility: the case of Itea,Corinth Gulf (Greece) |
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Authors: | Tatyana Novikova Gerassimos A Papadopoulos Vassilios Karastathis |
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Institution: | (1) Institute of Geodynamics, National Observatory of Athens, P.O. Box 24008, 11810 Athens, Greece |
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Abstract: | In the present paper we analyze the effect of local geology on ground motion by means of numerical calculations (numerical
models) using total (TS) and effective stress (ES) methods. These numerical calculations have been applied to the site of
Itea, Corinth Gulf, which was chosen based on liquefaction susceptibility criteria and field inspection. Data from seismic
refraction experiments and cone penetration test N-values as well as selected records of ground motion in nearby areas were
used to construct the input file for the numerical model. By means of␣dynamic analysis such characteristics of ground motion
as acceleration time histories, response spectra, and amplification function were evaluated. A one-dimensional soil amplification
effect was clearly shown. Liquefaction probability at the Itea site was predicted based on the safety factor and the calculation
of the induced settlement at the test site. Results of the TS and ES modeling lead us to conclude: (1) the presence of soft
soil at Itea caused significant amplification (almost 2.5-fold higher magnitude) of the underlying bedrock motion and, therefore,
can contribute to damage; (2) the area of Itea is highly susceptible to liquefaction due to presence of silty sand deposits
at depths between 2.48 m (the position of the water table) and 12 m that demonstrate the rapid growth of the excess pore water
pressure (EPWP) ratio with an increase in peak ground acceleration values. |
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Keywords: | Corinth Gulf Effective stress method Liquefaction susceptibility Total stress method Seismic refraction |
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