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Evaluation of ground motion characteristics, effects of local geology and liquefaction susceptibility: the case of Itea, Corinth Gulf (Greece)

Author

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  • Tatyana Novikova
  • Gerassimos Papadopoulos
  • Vassilios Karastathis

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. Copyright Springer Science+Business Media B.V. 2007

Suggested Citation

  • Tatyana Novikova & Gerassimos Papadopoulos & Vassilios Karastathis, 2007. "Evaluation of ground motion characteristics, effects of local geology and liquefaction susceptibility: the case of Itea, Corinth Gulf (Greece)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 40(3), pages 537-552, March.
    • Handle: RePEc:spr:nathaz:v:40:y:2007:i:3:p:537-552
    DOI: 10.1007/s11069-006-9018-9
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    Cited by:

    1. Sarda Thokchom & Vasu Pancholi & B. K. Rastogi & N. N. Dogra, 2018. "Liquefaction potential mapping in Dholera region of western India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(1), pages 479-495, May.
    2. Xiao-Hua Bao & Guan-Lin Ye & Bin Ye, 2014. "Explanation of liquefaction in after shock of the 2011 great east Japan earthquake using numerical analysis," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 74(3), pages 1881-1897, December.

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