GIS - based evaluation of the effect of local soil properties on the earthquake damage patterns

Orta büyüklükte depremler Sakarya bölgesini 10-30 yıl aralıklarla etkilemektedir. Bunların en sonuncusu olan 1999 depremleri bölgede zemin özelliklerine bağlı olarak farklı hasara neden olmuştur. Bu çalışmada, Sakarya Üniversitesi tarafından farklı zemin özellikleri gösterdiği bilinen Geyve ve Arifiye ilçe merkezlerinde yürütülen arazi ve laboratuvar çalışmalarından elde edilen sonuçlar CBS ortamında değerlendirilmiştir. Araştırma konusu iki ilçede yapılan sondajlar ve koni penetrasyon deneylerinden gelen bilgiler bir veri tabanına işlenmiş ve CBS tabanlı bir yazılımla değerlendirilmiştir. İncelenen 15 m derinlik boyunca tematik haritalar hazırlanarak, deprem sonrası oluşan hasar jeolojik, jeomorfolojik ve geoteknik açıdan değerlendirilmiştir. CBS ortamında hazırlanan haritalar yerel zemin özelliklerinin davranışı etkilediğini göstermekte, artan taşıma gücüyle ağır hasarlı bina sayısının azaldığı görülmektedir. Ayrıca, killi zeminlerin hakim olduğu bölgelerde sıvılaşma hasarının görülmediği teyit edilmektedir.

Yerel zemin özelliklerinin deprem hasarı üzerindeki etkisinin CBS ile değerlendirilmesi

Moderate magnitude earthquakes hit the Sakarya region, Turkey, in the range of 10-30 years. The 1999 earthquakes, which occurred in the study area, gave different damage patterns due to the variation of soil properties. In-situ and laboratory investigations were performed by Sakarya University in the centres of two townships in the Sakarya region: Arifiye and Geyve, which are known to possess different soil properties. Borings and cone penetration soundings were performed around the selected towns and data were entered into a database, which is connected to a Geographical Information System (GIS) software. Some thematic maps have been prepared for depths up to 15 m and an evaluation of damage patterns has been performed from points of view including: geology, geomorphology and geotechnical engineering in the investigation area. By evaluating the maps prepared in GIS, local soil properties affected the earthquake destruction of buildings. The number of heavily damaged buildings decreased with increasing bearing capacity. It was also proven that the liquefaction phonomena has not occurred in clayey areas.

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