Investigation of the soil amplification factor in the Adapazari region

Seyhan Firat, Nihat S. Isik, Hasan Arman, Mesut Demir, Isa Vural

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Turkey is located on the highly active Eurasian plate. A very active strike slip fault, the North Anatolian Fault Zone (NAFZ), crosses Turkey from east to west; earthquakes occurred on this fault on August 17, 1999 (Kocaeli) and November 12, 1999 (Düzce). Regional geology and subsoil conditions can significantly change the characteristics of ground motion. For this reason, determining soil amplification during an earthquake, especially for soft soils, is a very important topic for researchers. In this study, one dimensional ground response analyses were performed for selected Adapazari sites using the August 17, 1999 Kocaeli earthquake strong ground motion record with SHAKE2000 software. Soil characteristics and depth to engineering bedrock at the selected sites are different and the observed level of structural damage at these sites during the Kocaeli earthquake was also different. Calculated soil surface response spectrums at these sites were compared with the recommended design spectra of the Turkish Earthquake Code and the Eurocode 8. According to one dimensional ground response analyses, the calculated response spectra of the selected sites exceed the recommended design spectra of the Turkish Earthquake Code and the Eurocode 8. Calculations show that higher amplification ratios occur at higher periods due to soil behaviour. Results of this study indicate that local geological conditions may amplify ground motion at some periods and, due to this amplification, the calculated response spectra may exceed the recommended design spectra. Therefore, it is clear that local site conditions must be considered for earthquake-resistant engineering designs on soft alluvial soil deposits.

Original languageEnglish
Pages (from-to)141-152
Number of pages12
JournalBulletin of Engineering Geology and the Environment
Issue number1
Publication statusPublished - Feb 1 2016


  • Adapazari
  • Peak ground acceleration
  • Site conditions
  • Soil amplification
  • Soil characteristics

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology


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