Determination of soil dominant frequency/period and H/V spectral ratio values using earthquake data: The Case of Eskisehir Province Deprem verileri kullanilarak zemin hakim frekans/periyot ve H/V spektral oran deǧerlerinin belirlenmesi: Eskişehir Ili Örneǧi

In this study, it is aimed to calculate the soil dominant frequency/period and H/V spectral ratio (HVSR) values according to Nakamura method by using earthquake (M>3.5) data recorded by 14 strong ground motion stations located in Eskişehir by AFAD. In this context, 15-earthquakes of different magnitudes and distances were selected for each 14 stations. Soil dominant frequency and HVSR values were determined from the S-wave windows of earthquakes. Thus, these parameters were also determined from earthquake data, unlike calculations from microtremor data. The study results show high HVSR value (3.9-7.2) at low frequencies (0-2.0 Hz) of some stations. A multiple peak structure was observed. The lowest dominant frequency value as 0.25 Hz and the highest HVSR was 9.10. The results will contribute to earthquake hazard assessment for Eskişehir province, which has a deep sediment basin.