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Earthquakes as a natural hazard can cause a huge amount of destruction to buildings and to lifelines besides leading to severe loss of life. Lately, one notices that certain damage patterns can be directly related to the subsoil even though relating this damage to the cause of the damage is difficult. The damages induced by the soil can be caused e.g., by ground failure, slope instability or soil liquefaction. A method, which is applied to city planning to try to prevent the worst damage and to take into account all the geological, geotechnical and seismological risks, is microzonation, e.g. such as carried out in Basel in 1999. The necessary input data and the resulting hazard maps are presented using the case study accomplished in Turkey after the 1999 Kocaeli earthquake. A short introduction into the physical processes behind soil liquefaction is given. Geotechnical testing possibilities to investigate liquefaction phenomena further are also shown.
Index Terms:SoilGroup; Microzonation; turkey; liquefaction; Buchheister, Juliane
Further Information:Date published: 24.09.2003