Joınt Inversıon Of H/V And Spac Methods: A Case Study Of Eskişehir Basın

Seismic data analysis plays a crucial role in understanding ground structures and informing earthquake engineering applications. The study area, the Eskişehir Basin, is one of Turkey's most important agricultural and industrial regions. As population density and settlements in this region rapidly increase, knowledge of ground structure and earthquake risk assessment become critical. The basin is surrounded by highlands in the north and south and exhibits a flat plain character in its central part. The Nakamura's H/V technique and the Spatial Auto Correlation Method (SPAC) were employed to jointly evaluate the seismic behavior of different ground types using inverse solution and obtain S-wave velocity-depth profiles and determine the engineering bedrock depth at the measurement points. The evaluation revealed an average bedrock depth of 136 meters, an average bedrock depth velocity of 552 m/s, and Vs30 velocities ranging between 360 m/s and 400 m/s across the measurement points, with an average of 384 m/s. The findings indicate that the Eskişehir Basin's ground structure exhibits significant variability. Variations in bedrock depths and velocity suggest that seismic risk across the city's different regions also varies. This information can be utilized for urban planning, earthquake-resistant building design, and disaster risk reduction efforts.